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CN106430744A - Device for improving standards of discharged water of municipal sewage treatment plant to first-level A from first-level B - Google Patents

Device for improving standards of discharged water of municipal sewage treatment plant to first-level A from first-level B Download PDF

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Publication number
CN106430744A
CN106430744A CN201610634185.0A CN201610634185A CN106430744A CN 106430744 A CN106430744 A CN 106430744A CN 201610634185 A CN201610634185 A CN 201610634185A CN 106430744 A CN106430744 A CN 106430744A
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CN
China
Prior art keywords
level
electrolysis
flocculation
sewage
mark
Prior art date
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CN201610634185.0A
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Chinese (zh)
Inventor
张世文
邵敬
王峰
罗依依
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Boying Xiamen Science and Technology Co Ltd
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Boying Xiamen Science and Technology Co Ltd
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Priority to CN201610634185.0A priority Critical patent/CN106430744A/en
Publication of CN106430744A publication Critical patent/CN106430744A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention discloses a device for comprehensively improving standards of discharged water of a municipal sewage treatment plant to first-level A from first-level B. The device is made up of (1) an electrolyzing system, (2) a flocculating settling or air flotation system and (3) a filtering system. A first-level B water outlet is connected with a water inlet of the electrolyzing system, a water outlet of the electrolyzing system is connected with a water inlet of the flocculating settling or air flotation system, a water outlet of the flocculating settling or air flotation system is connected with a water inlet of the filtering system, and a water outlet of the filtering system is connected with a drainage opening. COD, BOD, ammonia nitrogen and total nitrogen are removed through electrolysis; COD, petroleum and vegetable oil are removed through flocculating settling or air flotation, and meanwhile, phosphorus, part of organic matters and total nitrogen are removed; and solid particulates (SS) are removed through filtering, and filtered effluent reaches the standards of first-level A.

Description

A kind of municipal sewage plant discharge water is carried device for mark by one-level B to one-level A
Technical field
The invention belongs to the field for the treatment of of water pollution of environmental project, more specifically refer to arrange municipal sewage plant Discharge water by《Urban wastewater treatment firm pollutant emission standard》（GB18918-2002）One-level B standard brings up to one-level A mark comprehensively Accurate device.
Background technology
In order to strengthen sewage disposal management, control water pollutes, and within 2002, country promulgates《Urban wastewater treatment firm pollutant Discharge standard》（GB18918-2002）.2006, former State Environmental Protection Administration pair《Urban wastewater treatment firm pollutant emission Standard》（GB18918-2002）The execution object of middle one-level A standard and one-level B standard is adjusted, it is desirable to：At town sewage Reason plant effluent enter country and save determine major river valley and lake, reservoir etc. close, semiclosed waters when, perform primary standard A standard, enter《Water environment quality standard》(GB3838-2002) III class function waters in（The drinking water source delimited Except protection zone and Swimming area）、《Sea water quality standard》（GB3097-1982）During middle seawater two class function waters, perform one-level The B standard of standard.
The more commonly used A2/O of current municipal sewage plant and improved process thereof（Such as UCT technique）, various oxidation ditches Technique, SBR class and modification technique thereof（CAST technique etc.）Deng, but nothing more than Activated Sludge Process and bio membrane process two Kind.Current activated sludge process has overwhelming superiority, and only minority Sewage Plant uses bio membrane process.Use going out of these techniques Water is such as not added with advanced treating majority and can only achieve《Urban wastewater treatment firm pollutant emission standard》（GB18918-2002）One-level B Standard effluent index, its index such as table 1：
The basic item controlled of table 1 the highest permission concentration of emission（Annual average）
Sequence number Basic item controlled One-level B standard（mg/L）
1 COD 60
2 BOD 20
3 SS 20
4 Vegetable and animals oils 3
5 Petroleum-type 3
6 Anion surfactant 1
7 Total nitrogen（In terms of N） 20
8 Ammonia nitrogen（In terms of N） 8（15）
9 Total phosphorus（In terms of P） 1
10 Colourity（Extension rate） 30
11 pH 6-9
12 Excrement colibacillus group number（Individual/L） 104
In order to improve water environment, State Council is with regard to the notice printing and distributing water prevention and cure of pollution action plan（Promulgated by the State Council (2015) 17）Want Asking, " sensitizing range (emphasis lake, emphasis reservoir, immediate offshore area watershed) urban wastewater treatment facility should be the end of the year 2017 Before reach one-level emission standard A comprehensively.Built-up areas water quality does not reaches the city of surface water IV class standard, newly-merged university sewage Treatment facility one-level to be performed emission standard A ".But, the water outlet of the sewage treatment process of existing municipal sewage plant can only Reach the standard of one-level B, it is impossible to the effluent quality of one-level A standard, it is impossible to meet (2015) No. 17 " water prevention and cure of pollution action of promulgated by the State Council The one-level A standard of plan " requires, its reason is：
1st, existing sewage treatment plant does not has flocculation process, and existing heavy pool process can only precipitate the precipitation removing larger particles, some Density is close with water, and particle diameter is that the little particle county float precipitation of 1～100 m is not thorough, does not only result in SS higher, also results in The indexs such as COD, BOD, total nitrogen, ammonia nitrogen are all higher；
2nd, existing sewage treatment plant does not has special dephosphorization process, and mainly utilize biochemical process bites phosphorus bacterium by the phosphorus richness in sewage Collect in mud, remove with the form of excess sludge.With influent quality fluctuation, phosphor-removing effect is unstable, it is impossible to meet The effluent index of 0.5mg/L；
3rd, existing one-level B sewage treatment plant is only through one-level biochemical treatment, does not has advanced nitrogen facility, and total nitrogen does not reaches one-level A Effluent index.
Additionally, vegetable and animals oils and petroleum-type also can not meet the standard of one-level A mostly.
Authorization Notice No. is that the patent of invention of CN 103848542B discloses a kind of sewage disposal and carries mark transformation sewage deep Processing technique, this technique increases by one section of efficient sedimentation tank and riser fiber cloth filter tank between the second pond and sterilization pool of former technique Group technology.Although this patent can solve dephosphorization and oil removal amount hang-up in former technique.It can however not meet one-level A The COD of standard, BOD, total nitrogen, ammonia nitrogen, dynamic plant oil, petroleum-type, anion surfactant, colourity（Extension rate）With excrement large intestine The indexs such as flora number.Therefore, at present, the representative technique that existing one-level B sewage treatment plant is retrofitted to one-level A has：
（1）" biological denitrificaion+chemical dephosphorization+filtration " technique；
（2）" chemical dephosphorization+MBR " technique.
If using " biological denitrificaion（De-COD, BOD）+ precipitation dephosphorization+filtration " reforming technology, ten thousand tons of sewage propose mark transformation About 600～8,000,000 yuan of standards of the investment of engineering, ten thousand tons of sewage put forward mark improvement project and take up an area about 1300～1700 square metres.BOT mould Under formula, the operation service expense of one-level B is about 0.8～1.0 yuan；After carrying mark, ton water running cost is by increase by 0.4～0.5 yuan, adds up to It is about 1.2～1.5 yuan/m3.
If using " chemical dephosphorization+MBR " technique, ten thousand tons of sewage propose the investment about 800～10,000,000 yuan of mark improvement project Standard, ten thousand tons of sewage put forward mark improvement project and take up an area about 700～800 square metres.The operation service expense of one-level B is about 0.8～1.0 Unit, increase by 0.6～simultaneously 0.9 yuan, total are about 1.4～1.9 yuan/m by the integrated operation cost processing water per ton3.
Both the above technique, not only newly-increased investment is big, and operating cost increases many, but also takies the large-area field of comparison Ground.But, increase investment and operating cost do not said, it is important to existing a lot of sewage treatment plants are in down town more, do not expand Build the place that improvement project needs.
Content of the invention
The present invention provides a kind of municipal sewage plant discharge water to put forward device for mark, its main purpose from one-level B to one-level A It is to overcome putting forward mark technique or needing new area increased place, investment and operating cost of existing one-level B standard water outlet, or It is to improve some index, the shortcoming that water outlet can not reach one-level A comprehensively.
The present invention adopts the following technical scheme that：
A kind of municipal sewage plant discharge water is carried device for mark by one-level B to one-level A, with the one-level B process of existing Sewage Plant Based on device, after raw sewage processing means second pond, increase electrolysis, flocculation sediment or air supporting, three systems of filtration, i.e. increase Add following system：
（1）Electrolysis system：Electrolysis system includes electrolysis machine main frame, dc source and three unit of automatic control system；By electricity Cl and O that solution preocess Anodic produces reacts with organic matter, ammonia nitrogen, generates CO2、H2O、N2And NO3 ?, remove organic matter, fall Low COD, BOD and ammonia nitrogen；" H " and " OH " that negative electrode produces and " NO3 ?", organic matter and ammonia nitrogen reaction, generate CO2、 H2O、N2；
（2）Flocculation sediment or air-flotation system：Flocculation sediment or air-flotation system include flocculation tank, sedimentation basin or air floatation machine；Electricity After the electrolysis of solution system, sewage enters flocculation tank, adds 1～20g/ m in flocculation tank3Ferrous sulfate flocculant solution With 1～5mg/ m3Flocculation aid carries out flocculation reaction, Fe2+With electrolysis unreacted Cl, O, OH or Cl completely2Reaction is raw Become Fe3+, Fe3+With PO4 3Reaction generates the phosphorus that ferric phosphate precipitation removes sewage, with OH-Reaction generates Fe (OH)3Precipitation is wadded a quilt with cotton Solidifying reaction, removes the organic matter such as petroleum-type, vegetable and animals oils by suction-operated, enters sedimentation basin or air floatation machine carries out solid-liquid and divides From solid sludges enters sludge treating system and is dehydrated into clod, and clear liquid enters filtration system；
（3）Filtration system：Filtration system is that sand filtration, multi-medium filtering or filtering cloth filtering pool filter are a kind of；Flocculation sediment or air supporting System（2）Sewage after process enters filtration system and filters the sewage i.e. reaching one-level emission standard A.
The operating voltage of described electrolysis machine is 1～500V, and two interelectrode voltages are 1～15V, current density is 5～ 500mA/cm2, step（2）The time of staying in electrolysis machine for the middle clear liquid is 5s～10min.
Described electrolysis machine is provided with power supply and electrolytic cell, the electrode in described electrolytic cell be graphite, titanium, iron, aluminium, zinc, copper, One in lead, nickel, molybdenum, chromium, alloy, the Ti electrode having precious metal oxide coating or nano-catalytic inert electrode.
The top layer of described nano-catalytic inert electrode is coated with the metal oxide containing precious metals inertia catalysis that crystal grain is 10～35nm Coating, the substrate of described nano-catalytic inert electrode is titanium plate, other metallic plates or plastic plate.
Described electrolysis system is Direct Electrolysis system or indirect electrolytic system.
Described flocculant is a kind of or any two or more combinations of molysite, aluminium salt, poly-aluminium, Polyferric Sulfate；Described molysite is sulphur Acid iron or ferrous sulfate；Described aluminium salt is aluminum sulfate or aluminium chloride；Described poly-aluminium is aluminium polychloride, polyaluminium sulfate or polymerization Alumina silicate；Described Polyferric Sulfate is poly-ferric chloride, bodied ferric sulfate or polyferric silicate sulfate；Consumption is 1～20g/m3.
Described flocculation aid is PAM, and consumption is 1～3g/m3.
Described flocculation sediment or air-flotation system also include one flocculation sediment sewage pH less than 8 when add NaOH or The chemicals dosing plant of the pH to 8～9 of sodium carbonate regulation sewage.
Described air floatation machine is dissolved gas floatator or shallow layer flotation machine.
There is following electrode reaction in electrolysis system electrolysis：
1st, anode
Main electrode reaction is：2Cl-2e → 2 Cl → Cl2↑
3H2O+2e→O·+2H3O?
Due to H3The generation of O, near anode, alkalescence reduces, acid rising.
, negative electrode
Negative electrode uses pure metallic titanium（Or corrosion resistant plate）, in the electrolysis of water, negative electrode also functions to important effect in purifying water： Reducing the concentration of heavy metal ion and active phosphorus etc., water quality is greatly improved, and can reach to surpass the standard of a class water.
On negative electrode, main chemical reaction is：H2O→H++OH-
Main electrode reaction is：2H++2e→2H·→ H2↑
2H3O++2e→2H·+2H2O→ H2↑+2H2O
Due to H2Precipitation, near negative electrode, acid reduce, alkalescence rises.
Other effects of the electrode process of negative electrode：
1. concentration polarization
When energising, negative electrode has substantial amounts of electronics, at this moment due to the effect of electric field force, the such as H of the cation in water3O+、 Na+、Ca2+、Mg2+、Pb2+、Cu2+... concentration polarization will be formed to cathodic migration.
2. many electric layer effect
Concentration at cathode surface cation will significantly rise, and forms electric double layer, just has anion at electric double layer outer layer Exist（Such as HPO4 2-、HCO3 -、Cl-... the anion of opposite charge, the ion of this layer is referred to as " counter ion "）, thus generate " three electric layer ", as shown in Figure 6：
3. precipitation reaction
Due to acid and base effect, cause HPO4 2-↔H++PO4 3-Balance move right.Again due to electric double layer effect, near negative electrode [Ca2+]、[PO4 3-] significantly increase, therefore there is precipitation reaction：
3Ca2++2PO4 3-→Ca3(PO4)2↓
In like manner, it would be possible to following precipitation reaction occurs：
The material generating is deposited upon cathode surface, thus forms negative electrode dirt.
The free radical activity that electrode reaction produces is very strong, and the organic molecule reaction that " O, OH " can be close with it generates Water and carbon dioxide；" O " and " NH3" water generation reaction and " NO3 ?”；" Cl and H " and close " NO3 ?" and " ammonia nitrogen）Instead N should be generated2And H2O.
Owing to, in the case of low-voltage, big electric current, being injected into electronic fog at electrode surface, therefore, electrode reaction is not only Occur at the electrode surface, but in the solid space of whole electrolysis machine.
The principle of COD, ammonia nitrogen, total nitrogen and colourity, stink is gone in electrolysis：
In electrolytic process, electrode reaction generates the free radicals such as Cl, O, OH, H；The not then generation OCl of reaction in time-.
（1）De-COD, BOD principle
R H（R represents organic radicals）+ O·—→CO2↑+H2O
（2）Decolouring（Deodorizing taste）Principle
R-R ＇（R ＇ represents organic matter chromophoric group）+O·—→CO2↑+H2O
（3）Ammonia nitrogen removal principle（Main reaction 1）：
NH3+HOCl—→NH2Cl+H2O（Monochloro amine）
NH2Cl+HOCl—→NHCl2+H2O（Dichlormaine）
2NH2Cl+HOCl—→N2↑+3HCl+H2O（Denitrogenation main reaction one）
（4）De-nitrate nitrogen principle（Main reaction 2）：
NH3+O·—→NO3 -+H2O
NO3 -+H·—→NO2 -+H2O
NO2 -+H·—→N2↑+H2O（Denitrogenation main reaction two）
Electrolysis has following effect and realizes following target：
（1）, electric shock effect
In low-voltage, under the big function of current, electric current directly punctures the cell membrane of microorganism in middle water, causes the death of microorganism.
（2）, capture electronic action
The microorganism living, all with electric charge, in low-voltage, under the big function of current, captures the electricity that the microorganism in middle water carries itself Son, makes microorganism lose electronics and dead.
（3）, free radical killing action
Electrolysis can produce the very strong free radical of chemism：Such as Cl, H, O, OH etc., can effectively kill virus, bacterium And the spore of algae plays the purpose of sterilization.
By three above effect, it is ensured that the microbiological indicator of water outlet is qualified.
（4）, oxidation
Chemism very strong free radical is produced during electrolysis：Such as Cl, H, O, OH etc., can promptly with having in sewage Machine thing, as organic matter, coloring matter, ammonia nitrogen, total nitrogen etc. play electrocatalytic reaction thus reduces its COD, BOD, total nitrogen, ammonia Nitrogen, the dynamic purpose planting oil, petroleum-type, anionic surfactant concentration and colourity.
（5）, precipitation
The OH producing in electrolytic process can be with some Action of Metal Ions（Such as Fe3+）Produce precipitation to settle down, these precipitations Little particle can play the effect of flocculation aid, promotes that the suspended material in solution assembles sedimentation.In other electrolytic process, electric field can be fast Speed destroys the colloform texture in water body, makes water body de-steady, promotes the micro-life killed in the solid suspension being present in waste water, water Thing, bacterium, algae and planktonic organism corpse, the colloid length being dissolved in water produce flocculation sediment, and the reduction of very big limit adds The consumption of flocculant.
（6）, air supporting effect
The H that in electrolytic process, negative electrode produces does not reacts with nitrate nitrogen in time, is generated as hydrogen, forms substantial amounts of microbubble, With the floating of gas, substantial amounts of solid suspension can be taken out of, reach the effect of separation of solid and liquid, form air supporting effect, further Reduce the pollution indexs such as the COD in waste water, colourity, turbidity.
（7）, synergy
Electrolysis can also produce significant cooperative effect in addition to producing free radical, such as acid and base effect, many electric layer effect, air supporting effect Should, inductive effect and adsorption effect etc. therefore can be greatly improved the efficiency of NCE.
（8）, deodorization
Electrolysis smells material effect except the free radical producing with sending out in sewage, can eliminate outside odor, the electromagnetic vibration of electrolytic process Swing the chemical bond generation open loop chain scission that can make malodoring substance, thus eliminate stink.Therefore, electrolysis has and makes it difficult for what people write Eliminate stink effect.
Guaranteed the COD of water outlet, BOD, total nitrogen, ammonia nitrogen by above effect, move and plant oil, petroleum-type, anion surface active Agent concentration and chromaticity index are qualified.
Step（2）Dephosphorization principle described in flocculation sediment：
Fe2++Cl·—→ Fe3++Cl?
Fe2++OH·—→ Fe3++OH?
Fe3++PO4 3—→FePO4↓（Dephosphorization main reaction）
Fe3++ 3OH?—→Fe（HO）3
Additionally, many electric layer effect also can be produced：
Meanwhile, by flocculation, the unnecessary free radical that electrolysis produces can be consumed.
Compared to the prior art the present invention, has the advantage that：
1st, solve existing Sewage Plant to carry mark and there is no the inadequate predicament in place or place
The present invention does not needs to change the whole technological process of existing Sewage Plant, has only in existing Sewage Plant in putting forward mark improvement project Second pond after the very little electrolytic cell of occupation of land, flocculation sedimentation tank and the filtering ponds that increase, existing sewage disposal can be made full use of The gap of factory, it is not necessary to increase land area.I.e. use：One-level B sewage → electrolysis → flocculation sediment or air supporting → filtration → mono- The group technology of level A discharge.Whole improvement project does not change original production technology layout, and newly-increased land area is 350～ 450m2/ ten thousand tons, both solved existing Sewage Plant and carried mark and there is no the inadequate Realistic Dilemma in place or place, saved again great amount of investment.
2nd, existing facility and the substantially all utilization of equipment, does not results in original investment waste.
3rd, on the basis of former technique and equipment, only increase electrolysis, flocculation sediment and filtering technique and equipment, only increase and throw Provide 450～5,500,000 yuan/ten thousand tons.
4th, the sterilization after second pond change into electrolysis can by adjust electric current, Control of Voltage sterilization, C0D, BOD, move plant oil, The indexs such as petroleum-type, anion surfactant, colourity, ammonia nitrogen and total nitrogen, it is ensured that the discharge water after process can be fully achieved 《Urban wastewater treatment firm pollutant emission standard》（GB18918-2002）Middle one-level A class standard, uses maneuverability.
5th, on the basis of one-level B operating cost, the processing cost of sewage increases by 0.1～0.3/m3Unit, operating cost is low.
6th, anti-COD, BOD, total nitrogen load impact reserves current capacity at electrowinning process by suitable by force, when in sewage When the load variations such as COD, BOD, total nitrogen are big, by adjusting power consumption, it is possible to meet anti-load impact.
Brief description
Fig. 1 is for when the representative technique of previous stage B discharge standard sewage treatment plant（A2O technique）Flow chart.
Fig. 2 is Direct Electrolysis on the basis of one-level B technological process of the present invention, flocculation sediment and filtering technique flow chart.
Fig. 3 is indirect electrolytic on the basis of one-level B technological process of the present invention, flocculation sediment and filtering technique flow chart.
Fig. 4 is the process chart that the present invention increases Direct Electrolysis, flocculation-air floating and filtration on the basis of former technological process.
Fig. 5 is the process chart that the present invention increases indirect electrolytic, flocculation-air floating and filtration on the basis of former technological process.
Fig. 6 is negative electrode three electric layer schematic diagram.
Detailed description of the invention
Detailed description of the invention referring to the figure explanation present invention.
Embodiment one
With reference to Fig. 2, the transformation embodiment of certain sewage treatment plant, at former facility（Fig. 1）Increase Direct Electrolysis machine, wadding after second pond Solidifying pond, sedimentation basin and filtering ponds, draining i.e. reaches comprehensive one-level emission standard A.
The effluent quality index of described one-level B such as table 2
Water quality index after the biochemical operation of table the 2nd, certain sewage treatment plant
Sequence number Basic item controlled Measured value（mg/L）
1 COD 60
2 BOD 20
3 SS 20
4 Vegetable and animals oils 3
5 Petroleum-type 3
6 Anion surfactant 1
7 Total nitrogen（In terms of N） 20
8 Ammonia nitrogen（In terms of N） 8
9 Total phosphorus（In terms of P） 1.5
10 Colourity（Extension rate） 35
11 pH 8-9
12 Excrement colibacillus group number（Individual/L） 1.34*104
One-level B standard draining enters electrolysis machine by supply-water pump water outlet, and during electrolysis, the voltage between adjacent two-plate is 1.5V, electric current Density is 500mA/cm2, press 3mg/L after electrolysis and add copperas solution, under conditions of rotating speed is 60 turns after flocculation reaction, Add flocculation aid PAM to enter sedimentation basin after reacting under conditions of rotating speed is 20 turns by 1mg/L, pass through again after the precipitation of heavy pond Sand filtration filtering ponds, effluent quality such as table 3.
The 3rd, table discharges water water quality index
Sequence number Basic item controlled Measured value（mg/L）
1 COD 12
2 BOD 3
3 SS 5
4 Vegetable and animals oils 0.2
5 Petroleum-type 0.1
6 Anion surfactant 0.5
7 Total nitrogen（In terms of N） 11
8 Ammonia nitrogen（In terms of N） 3
9 Total phosphorus（In terms of P） 0.3
10 Colourity（Extension rate） 25
11 pH 8-9
12 Excrement colibacillus group number（Individual/L） 1.34*102
As known from Table 3, fully meet through above improved effluent index《Urban wastewater treatment firm pollutant emission standard》 （GB18918-2002）Middle one-level A class standard.Improvement project increases scale of investment 4,500,000 yuan/ten thousand tons, takes up an area 350m2/ ten thousand tons, Energy consumption adds 0.25 KWh/ton.
Embodiment two
With reference to Fig. 3, the transformation embodiment of certain sewage treatment plant, tie up to former facility（Fig. 1）Indirectly increase after second pond electrolysis machine, Flocculation basin, sedimentation basin and flotation tank, the draining after air supporting i.e. reaches comprehensive one-level emission standard A.
The effluent quality index of described second pond one-level B such as table 4.
The water quality index of table the 4th, certain secondary sedimentation tank of sewage treatment work precipitation rear stage B
Sequence number Basic item controlled Measured value（mg/L）
1 COD 60
2 BOD 19
3 SS 48
4 Vegetable and animals oils 3
5 Petroleum-type 3
6 Anion surfactant 1
7 Total nitrogen（In terms of N） 23
8 Ammonia nitrogen（In terms of N） 15
9 Total phosphorus（In terms of P） 1.0
10 Colourity（Extension rate） 45
11 pH 6-7
12 Excrement colibacillus group number（Individual/L） 1.26*105
After described one-level B water outlet enters electrolysis machine electrolysis by water pump, enter haptoreaction pond, enter back into flocculation tank, Add copperas solution by 15mg/L, and add 5% sodium hydroxide solution regulation pH to 8-9（Owing to pH is 6-7）, it at rotating speed is Under conditions of 120 turns after flocculation reaction, enter and help solidifying filling, by 1mg/L add flocculation aid PAM under conditions of rotating speed is 60 turns anti- Flotation tank, then the effluent quality such as table 5 through filtering again after air-flotation process is entered after should.
The water quality index that the 5th, table discharges water through filtration treatment heel row
Sequence number Basic item controlled Measured value（mg/L）
1 COD 28
2 BOD 5
3 SS 9
4 Vegetable and animals oils 0.5
5 Petroleum-type 0.5
6 Anion surfactant 0.5
7 Total nitrogen（In terms of N） 10
8 Ammonia nitrogen（In terms of N） 3
9 Total phosphorus（In terms of P） 0.2
10 Colourity（Extension rate） 4
11 pH 6-8
12 Excrement colibacillus group number（Individual/L） 200
As known from Table 5, fully meet through above improved effluent index《Urban wastewater treatment firm pollutant emission standard》 （GB18918-2002）Middle one-level A class standard.Improvement project increases scale of investment 5,500,000 yuan/ten thousand tons, newly-increased occupation of land 450m2/ ten thousand Ton, energy consumption adds 0.35 KWh/ton.
Embodiment three
With reference to Fig. 4, the transformation embodiment of certain sewage treatment plant, tie up to former facility（Fig. 1）Increase electrolysis machine, flocculation after second pond Pond, flotation tank and sand filter, the sewage after electrolysis enters flocculation basin, flotation tank, then after sand filter filters, draining i.e. reaches Comprehensive one-level emission standard A.
Effluent quality index such as table 6 after described second pond operation precipitation.
Water quality index after table the 6th, certain secondary sedimentation tank of sewage treatment work precipitation operation
Sequence number Basic item controlled Measured value（mg/L）
1 COD 41
2 BOD 9
3 SS 20
4 Vegetable and animals oils 3
5 Petroleum-type 3
6 Anion surfactant 1
7 Total nitrogen（In terms of N） 18
8 Ammonia nitrogen（In terms of N） 8
9 Total phosphorus（In terms of P） 1.0
10 Colourity（Extension rate） 30
11 pH 6-7
12 Excrement colibacillus group number（Individual/L） 1.26*105
Described one-level B water outlet is all relatively low due to COD, BOD, and only total nitrogen, ammonia nitrogen, total phosphorus, petroleum class and zoology and botany oil exceeds standard, electricity During solution, electricity consumption is less, and water outlet after electrolysis enters flocculation tank, adds aluminum sulfate solution by 3mg/L, and adds 5% sodium carbonate liquor Regulation pH to 8-9（Owing to pH is 6-7）, under conditions of rotating speed is 120 turns after flocculation reaction, enters and help solidifying filling, add by 3mg/L Enter entrance flotation tank after flocculation aid PAM reacts under conditions of rotating speed is 60 turns, then the effluent quality after filtration treatment is such as Table 7.
Table the 7th, effluent quality index
Sequence number Basic item controlled Measured value（mg/L）
1 COD 19
2 BOD 6
3 SS 5
4 Vegetable and animals oils 0.5
5 Petroleum-type 0.5
6 Anion surfactant 0.5
7 Total nitrogen（In terms of N） 13
8 Ammonia nitrogen（In terms of N） 1
9 Total phosphorus（In terms of P） 0.1
10 Colourity（Extension rate） 20
11 pH 6-9
12 Excrement colibacillus group number（Individual/L） 1.35*102
As known from Table 7, fully meet through above improved effluent index《Urban wastewater treatment firm pollutant emission standard》 （GB18918-2002）Middle one-level A class standard.Newly-increased 5,500,000 yuan/ten thousand tons, take up an area 450m2/ ten thousand tons, energy consumption add 0.16 degree/ Ton.
Embodiment four
With reference to Fig. 5, the transformation embodiment of certain sewage treatment plant, owing to the effluent characteristics of former engineering is preferable, COD, BOD, ammonia nitrogen, total The indexs such as nitrogen, petroleum-type, vegetable and animals oils are all qualified, and only total phosphorus and excrement colibacillus group number is defective, therefore, is selected in second pond Followed by indirect electrolytic machine, flocculation basin, flotation tank and more medium filter, draining i.e. reaches comprehensive one-level emission standard A.
The effluent quality index such as 8 of described second pond.
Draining water quality index after table the 8th, certain secondary sedimentation tank of sewage treatment work
Sequence number Basic item controlled Measured value（mg/L）
1 COD 45
2 BOD 8
3 SS 8
4 Vegetable and animals oils 1
5 Petroleum-type 1
6 Anion surfactant 1
7 Total nitrogen（In terms of N） 13
8 Ammonia nitrogen（In terms of N） 2
9 Total phosphorus（In terms of P） 1.5
10 Colourity（Extension rate） 20
11 pH 8-9
12 Excrement colibacillus group number（Individual/L） 1.34*104
After described secondary clarifier effluent enters electrolysis machine indirect electrolytic, enter haptoreaction pond, enter back into flocculation basin, add by 3mg/L Enter polymeric silicicacid ferrous solution, under conditions of rotating speed is 120 turns after flocculation reaction, enters and help solidifying filling, add flocculation aid by 1mg/L PAM enters flotation tank air supporting, then the water outlet water after more medium filter filters after reacting under conditions of rotating speed is 40 turns Matter such as table 9.
Table the 9th, filter after effluent quality index
Sequence number Basic item controlled Measured value（mg/L）
1 COD 15
2 BOD 5
3 SS 3
4 Vegetable and animals oils 1
5 Petroleum-type 1
6 Anion surfactant 0.5
7 Total nitrogen（In terms of N） 9
8 Ammonia nitrogen（In terms of N） 0.3
9 Total phosphorus（In terms of P） 0.2
10 Colourity（Extension rate） 8
11 pH 8-9
12 Excrement colibacillus group number（Individual/L） 1.34*102
As known from Table 9, fully meet through above improved effluent index《Urban wastewater treatment firm pollutant emission standard》 （GB18918-2002）Middle one-level A class standard.Newly-increased 5,500,000 yuan/ten thousand tons, take up an area 450m2/ ten thousand tons, energy consumption add 0.15 degree/ Ton.
Above are only the detailed description of the invention of the present invention, but the design concept of the present invention is not limited thereto, all utilize this Design carries out the change of unsubstantiality to the present invention, all should belong to the behavior invading scope.

Claims (9)

1. municipal sewage plant discharge water is carried device for mark by one-level B to one-level A, it is characterised in that with existing sewage Based on the one-level B processing means of factory, after raw sewage processing means second pond, increase electrolysis, flocculation sediment or air supporting, filtration Three systems, i.e. increase following system：
（1）Electrolysis system：Electrolysis system includes electrolysis machine main frame, dc source and three unit of automatic control system；By electricity Cl and O that solution preocess Anodic produces reacts with organic matter, ammonia nitrogen, generates CO2、H2O、N2And NO3 ?, remove organic matter, fall Low COD, BOD and ammonia nitrogen；" H " and " OH " that negative electrode produces and " NO3 ?", organic matter and ammonia nitrogen reaction, generate CO2、 H2O、N2；
（2）Flocculation sediment or air-flotation system：Flocculation sediment or air-flotation system include flocculation tank, sedimentation basin or air floatation machine；Electricity After the electrolysis of solution system, sewage enters flocculation tank, adds 1～20g/ m in flocculation tank3Ferrous sulfate flocculant solution With 1～5mg/ m3Flocculation aid carries out flocculation reaction, Fe2+With electrolysis unreacted Cl, O, OH or Cl completely2Reaction is raw Become Fe3+, Fe3+With PO4 3Reaction generates the phosphorus that ferric phosphate precipitation removes sewage, with OH-Reaction generates Fe (OH)3Precipitation is wadded a quilt with cotton Solidifying reaction, removes the organic matter such as petroleum-type, vegetable and animals oils by suction-operated, enters sedimentation basin or air floatation machine carries out solid-liquid and divides From solid sludges enters sludge treating system and is dehydrated into clod, and clear liquid enters filtration system；
（3）Filtration system：Filtration system is that sand filtration, multi-medium filtering or filtering cloth filtering pool filter are a kind of；Flocculation sediment or air supporting System（2）Sewage after process enters filtration system and filters the sewage i.e. reaching one-level emission standard A.
2. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：The operating voltage of described electrolysis machine is 1～500V, and two interelectrode voltages are 1～15V, current density is 5～ 500mA/cm2, step（2）The time of staying in electrolysis machine for the middle clear liquid is 5s～10min.
3. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：Described electrolysis machine is provided with power supply and electrolytic cell, the electrode in described electrolytic cell be graphite, titanium, iron, aluminium, zinc, copper, lead, One in nickel, molybdenum, chromium, alloy, the Ti electrode having precious metal oxide coating or nano-catalytic inert electrode.
4. a kind of municipal sewage plant as claimed in claim 3 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：The top layer of described nano-catalytic inert electrode is coated with the metal oxide containing precious metals inertia catalysis that crystal grain is 10～35nm and applies Layer, the substrate of described nano-catalytic inert electrode is titanium plate, other metallic plates or plastic plate.
5. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：Described electrolysis system is Direct Electrolysis system or indirect electrolytic system.
6. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：Described flocculant is a kind of or any two or more combinations of molysite, aluminium salt, poly-aluminium, Polyferric Sulfate；Described molysite is sulfuric acid Iron or ferrous sulfate；Described aluminium salt is aluminum sulfate or aluminium chloride；Described poly-aluminium is aluminium polychloride, polyaluminium sulfate or polymerization silicon Acid aluminium；Described Polyferric Sulfate is poly-ferric chloride, bodied ferric sulfate or polyferric silicate sulfate；Consumption is 1～20g/m3.
7. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：Described flocculation aid is PAM, and consumption is 1～3g/m3.
8. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：Described flocculation sediment or air-flotation system also include one flocculation sediment sewage pH less than 8 when add NaOH or The chemicals dosing plant of the pH to 8～9 of sodium carbonate regulation sewage.
9. a kind of municipal sewage plant as claimed in claim 1 discharge water is carried device for mark by one-level B to one-level A, its spy Levy and be：Described air floatation machine is dissolved gas floatator or shallow layer flotation machine.
CN201610634185.0A 2016-08-05 2016-08-05 Device for improving standards of discharged water of municipal sewage treatment plant to first-level A from first-level B Pending CN106430744A (en)

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Application publication date: 20170222