CN101172703A - Oxidation ditch technique processing method based on feed water variation of water quality - Google Patents
Oxidation ditch technique processing method based on feed water variation of water quality Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 230000003647 oxidation Effects 0.000 title claims abstract description 104
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 104
- 238000000034 method Methods 0.000 title claims abstract description 83
- 238000003672 processing method Methods 0.000 title 1
- 238000006396 nitration reaction Methods 0.000 claims abstract description 22
- 230000000694 effects Effects 0.000 claims abstract description 15
- 238000004458 analytical method Methods 0.000 claims abstract description 9
- 238000011217 control strategy Methods 0.000 claims abstract description 7
- 239000010802 sludge Substances 0.000 claims description 34
- 239000010865 sewage Substances 0.000 claims description 29
- 230000001360 synchronised effect Effects 0.000 claims description 21
- 238000005276 aerator Methods 0.000 claims description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 17
- 238000012544 monitoring process Methods 0.000 claims description 17
- 229910052760 oxygen Inorganic materials 0.000 claims description 17
- 239000001301 oxygen Substances 0.000 claims description 17
- 238000005516 engineering process Methods 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 claims description 13
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims description 12
- 238000005273 aeration Methods 0.000 claims description 10
- 230000003203 everyday effect Effects 0.000 claims description 10
- 230000001105 regulatory effect Effects 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 6
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 6
- 101100049727 Arabidopsis thaliana WOX9 gene Proteins 0.000 claims description 4
- 101150059016 TFIP11 gene Proteins 0.000 claims description 4
- 102100032856 Tuftelin-interacting protein 11 Human genes 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000012795 verification Methods 0.000 claims description 4
- 238000004886 process control Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 150000003016 phosphoric acids Chemical class 0.000 claims description 2
- 238000004088 simulation Methods 0.000 claims description 2
- 238000010561 standard procedure Methods 0.000 claims description 2
- 238000013461 design Methods 0.000 abstract description 5
- 238000003911 water pollution Methods 0.000 abstract description 2
- 238000011160 research Methods 0.000 description 8
- 230000002354 daily effect Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 241000727649 Orbales Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000013486 operation strategy Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000003933 environmental pollution control Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000011112 process operation Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention discloses an oxidation gouge art treating method based on the inlet water quality change, and the method belongs to the technical field of the water pollution control in environment protection. The method is a set of control condition and operation method realizing high efficiency and stable synchronic nitration and denitrification process under the carrousel oxidation gouge condition. Firstly, the water quality component of the inlet water is determined from the read inlet water data and then the dynamic change characteristics are obtained through analysis; the operation manner and the control condition of the oxidation gouge are primarily determined; at the same time, the operation control condition of the oxidation gouge is further determined according to the inlet water volume and the dynamic change rule of the water quality; and finally the control strategy for stably operating the oxidation gouge is gotten. The invention is used for upgrading the alternation and optimizing the operation of the established oxidation gouge art, and optimizing the design of the newly built oxidation gouge art, as well as improving the treating effect of the oxidation gouge art.
Description
Technical field
The invention belongs to technical field of water pollution control in the environment protection.Be particularly related to the upgrading that is applied to build oxidation ditch process, optimize the optimization design of operation and newly-built oxidation ditch process, promote a kind of oxidation ditch process treatment process that changes based on influent quality of oxidation ditch process wastewater treatment efficiency.
Background technology
The problem of environmental pollution sternness of China at present, the eutrophication problem of water body is on the rise, simultaneously, and along with China's rapid economy development, the demand of the energy also grows with each passing day, the environment and the energy become the Economic development of present restriction China and influence people's quality of life important factor.Municipal sewage treatment is one of energy-intensive industry, and in the running cost of conventional municipal sewage plant (comprising depreciation funds etc.), the electricity charge account for more than 1/3rd, and aeration power consumption wherein accounts for 40%～50% of full factory of sewage work power consumption.Can either improve sewage work's treatment effect, can also realize simultaneously having great importance the gordian technique of saving energy and reduce the cost for the present situation of alleviating the current energy scarcity of China.
In existing sewage disposal, entry the time change, daily variation is ubiquitous problem to having a strong impact on of sewage treatment process operation.The entry of general municipal sewage plant all is to present bigger fluctuating range, flow and water concentration all can present certain rules variation characteristics, the maximum flow of every day can be 3-4 a times of minimum flow, water concentration equally also presents similar variation characteristics, and high loading and underload all can continue the long period, and this just causes the entry water quantity and quality concentration of sewage work bigger changes in amplitude to occur one day scope.Thereby cause in the actual moving process of sewage work, the load high-stage, the removal effect variation of pollutent, and, then cause significantly energy wastage in the low stage of load, also have influence on the removal effect of pollutent simultaneously.Simultaneously, the water factory that has built adopts bigger design safety factor mostly, with the fluctuation that prevents the entry load water factory's operation is caused bigger influence, and this also makes the building cost of water factory and operation energy consumption increase, and causes very big waste.
The mid-90 in 20th century, oxidation ditch process is because of its good denitrification effect and need not primary sedimentation pond and begin to be promoted, and the large-scale sewage disposal project that build this period adopts oxidation ditch process basically.In recent years, China introduces more oxidation Ditch Technology and mainly contains Orbal oxidation ditch, Carrousel oxidation ditch, T type oxidation ditch, DE type oxidation ditch, integrated oxidation ditch etc., and wherein improved Carrousel oxidation ditch and Orbal oxidation ditch are in the majority.Simultaneously, certain research has been carried out in aspects such as the effect of domestic dephosphorization denitrogenation to all kinds oxidation ditch, design, oxygen replenishing equipment and operation control.Multiple oxidation ditch has all been carried out certain innovation, develop into Carrousel2000 type oxidation ditch as the Carrousel oxidation ditch by the common Carrousel oxidation ditch of the first-generation with denitrogenation dephosphorizing function, after develop into the Carrousel3000 type oxidation ditch of the third generation again.New sewage work's comprehensive discharge standard has proposed new requirement to sewage work's operation, all is to improve the operating performance of water factory by setting up new construction unit generally.
The synchronous nitration and denitrification technology is applied in the technological process of a lot of sewage disposals as a kind of technology that can save operation energy consumption.Successively there are some scholars that the synchronous nitration and denitrification process of oxidation ditch process was carried out some researchs, find that oxidation ditch process has characteristics such as the dissolved oxygen conditions that alternately changes and big hydraulic detention time, has a good advantages condition for the synchronous nitration and denitrification process, also proved the generation (Rittman that the synchronous nitration and denitrification process is arranged in the oxidation ditch, B.E.Simultaneous denitrification with nitrification in single-channeloxidation ditches[J] .Wat.Pollut.Control Fed., 1985,57 (4), 300-308. Peng Yong attains, Hou Hongxun, Qiao Haibing, Wang Shaopo. modified form Carrousel oxidation ditch process biological carbon and phosphorous removal effect research [J]. Techniques and Equipment for Environmental Pollution Control, 2006,7 (12): 42-45.GAO Shouyou, PengYongzhen, Dong Wenyi, et al.Pilot studies of factors influencing thesimultaneous nitrification and denitrification in an oxidation ditchtreating the domestic wastewater at low cost. future urban wastewatersystem-decentralisation and reuse IWA conference, Xi ' an, 2005,18-20.), the investigator is arranged simultaneously by increasing the anaerobism contact tank, the carbon source of supplemental ditch denitrification process, thereby realize reinforcement (HAO Xiaodi to oxidation ditch synchronous nitration and denitrification process, Hans J and JohanW.Conditions and mechanisms affecting simultaneous nitrification anddenitrification in a pasveer oxidation ditch.BioresourceTechnology.1997,59:207-215.).But the influence of the load variations of entry to oxidation ditch synchronous nitration and denitrification process all do not considered in these researchs fully, comprise water yield every day, the influence of stability takes place in change of water quality to oxidation ditch synchronous nitration and denitrification process, have only indivedual investigators (GucluInsel etc. are at document " Effect of Aeration on nutrient removal performance ofoxidationditchsystems.Env.Eng.Sci.; 2005; 22 (6): 802-815 " and " B.Y.Ammaryand J.A.Radaideh.Simultaneous nitrification and denitrification in anoxidation ditch plant.Chemi.Biochm.Eng.2005; 19 (2): 207-212 ". middle report, utilize modeling methods analyst Benchmark the entry surging condition to the oxidation ditch aeration condition effect with and also have the investigator to utilize the oxidation trench technology synchronous nitration denitrification process to the influence of organic matter removal process, realized effective removal of high-concentration waste water under the low dissolved axygen condition (COD 1500mg/L, ammonia nitrogen 200mg/L).
In sum, the dynamic change of sewage work's entry all can cause treatment effect in the present technology operational process bad or effect is unstable, also cause simultaneously the waterworks construction cost increase with operational process in energy wastage.Oxidation ditch is realized the tactful difference of synchronous nitration and denitrification condition under different entry condition of water quality, and day entry dynamic change is to the influence and the corresponding control strategy of oxidation ditch synchronous nitration and denitrification operating performance, at present all also not than the systematic research result.Research to entry day dynamic change influence generally all still be the research of control method and control model itself simultaneously, studies owing to lack the checking of actual engineering experiment, make these achievements in research still difficulty in actual engineering, obtain application.Will be under the oxidation ditch condition, realize the synchronous nitration and denitrification process of stability and high efficiency, need a new operation scheme and control method, change different quality condition effect and entry load dynamic effects into favourable condition that water factory moves, under the oxidation ditch condition, realize efficient and energy-conservation synchronous nitration and denitrification process.
Summary of the invention
The objective of the invention is water quality characteristics and the sewage quality of same water factory and the daily variation rule of the water yield, a kind of oxidation ditch process treatment process that changes based on influent quality is provided at China's different regions municipal effluent.This method mainly comprises following 6 steps.
1) reads into water data, influent quality composition and water inlet dynamic change characteristic are analyzed
At first determine the water quality components of water inlet, analyze the acquisition dynamic change characteristic again from the water inlet data that read; Specifically the water yield and the water quality of water inlet are carried out 24 hours sampling and measuring, water yield data obtain from the routine monitoring equipment of water factory; The component index and the water quality data that need this moment to determine comprise TCOD (total biochemical oxygen demand (BOD)), SCOD (solvability biochemical oxygen demand (BOD)), NH
3-N (ammonia nitrogen), TN (total nitrogen), TP (total phosphorus), its monitoring method is carried out according to water quality monitoring (WQM) standard conventional in " water and effluent monitoring analytical procedure (the 4th edition) ", or pass through to be equipped with in advance good online water quality and quantity Monitoring equipment: STIP-SCAN All-in-One sewage quality on-line monitoring instrument, ISCO/STIP buoy type nh 3-n analyser, SCO/STIP buoy type phosphoric acid salt analyser obtain, and this part is the precondition that definite oxidation ditch is realized the synchronous nitration and denitrification strategy;
2) determine the technology operation scheme
Read the component index and the water quality data determined of into water data acquisition according to step 1), earlier the water quality characteristics of water inlet is judged, if the water concentration of municipal sewage plant's water inlet can satisfy following condition: TCOD＞300mg/L fully, TCOD/TN＞10, SCOD/TCOD＞0.7, then this water concentration is defined as for the sufficient water quality of oxidation ditch synchronous nitration and denitrification process carbon source; On the contrary,, then can be defined as, if be the inadequate water quality of carbon source, from the position water inlet of the water inlet 6 of oxidation ditch device for the inadequate water quality of oxidation ditch synchronous nitration and denitrification process carbon source if can not satisfy as above condition simultaneously; If be the sufficient water quality of carbon source, in order to guarantee the water outlet effect, then need in advance water inlet position, intake from the position of the water inlet 4 of oxidation ditch device.
3) determine system's operating load
According to influent quality and the water yield data that monitoring obtains, determine the hydraulic detention time HRT of oxidation ditch operation and the sludge concentration MLSS of normal operating condition, the ammonia nitrogen loading and the COD that are calculated under the acquisition system operational conditions by formula (1) and formula (2) load; And, determine the sludge concentration and the dissolved oxygen controlled levels of system's normal running (operation) conditions according to the temperature condition of working time with according to the load range of system.Ammonia nitrogen loading and COD load calculation formula are as follows:
(1) N
COD(gCOD/gMLSS*d)=Q
Go into(m
3/ d) * C
COD(mg/L)/MLSS (mg/L)/V (m
3);
(2) N
NH3(gNH
3/ gMLSS*d)=Q
Go into(m
3/ d) * C
NH3(mg/L)/MLSS (mg/L)/V (m
3);
N wherein
COD-entry COD load; N
NH3-entry ammonia nitrogen loading; Q
Go into-discharge; , C
COD-entry COD concentration; C
NH3-entry ammonia nitrogen concentration; The MLSS-activated sludge concentration; D (my god).
4) determine the dynamic control condition of oxidation ditch
The amount of inlet water that obtains according to as above monitoring and water quality day dynamic changing data, determine the entry rangeability of every day according to formula (1) and (2), to be scaled the entry load variations of system, again with (3) 0.12＜N
COD(gCOD/gMLSS*d)＜0.15; (4) 0.02＜N
NH3(gNH
3/ gMLSS*d)＜0.06 given standard load scope is compared, the system sludge concentration that load criterion is not met the standard operating load scope time period is adjusted, make the loading condiction of this period can satisfy (3) and (4) given standard load condition, simultaneously again according to the sludge concentration of determining, according to formula (5) Q
Oxygen requirement(kgO
2/ h)=(0.55-0.80) MLSS estimates the system's oxygen requirement under this operational conditions.According to the changing conditions of intaking every day, determine the running status condition of 2-4 different steps every day, with this oxidation ditch is moved and dynamically control; Wherein MLSS is when sludge concentration is high, gets than big coefficient, when sludge concentration is low, gets less coefficient, suitably adjusts according to temperature condition simultaneously;
Running status deterministic process as above, need follow following conditional relationship:
I. at first according to the water yield and the water quality situation of water inlet, calculate the COD organic loading of water inlet,, determine the suitable operation sludge concentration of oxidation ditch then according to payload;
Ii. again according to the water yield and the water quality situation of water inlet, calculate the NH of water inlet
3Organic loading is then according to NH
3The organic loading size, final definite operation sludge concentration; In the running status process, with NH
3Compare with the load of COD, be as the criterion with higher that of burden requirement;
Iii. according to the final running status of determining, judge the sludge concentration scope, then according to the platform number and the rotating speed of determining the aerator unlatching of sludge concentration, and definite spoil disposal time.
5) modeling verification condition scope and definite tactful specific implementation method
Determine after basic the technology operation form and working order, the operation sewage treatment process modeling (ODSS of system, Tsing-Hua University's exploitation), the preliminary processing condition of determining are carried out analog calculation, operating performance to as above state of the art is carried out simulation and forecast, according to predicting the outcome, the problem that exists in system's operational process is revised.
Dynamic change at water inlet, oxidation ditch is divided into several different control stage and running statuses, by sludge concentration in the dynamic controlled oxidation ditch and corresponding aeration rate, realization is to the adjusting and the control of oxidation ditch operational conditions, sludge concentration is regulated and can be realized by the big flow returned sluge of moment, load variations to water inlet is regulated, and dissolved oxygen is regulated then and can be achieved by the control of aerator being opened platform number and aeration watt level.This control strategy needs intrasystem active sludge reserves bigger, will carry out spoil disposal in the less operation phase of sludge back flow quantity simultaneously.
6) determine that aerator opens the arrangement of scheme and impeller
After determining the unlatching strategy of aerator, utilize the fluidised form of hydrodinamical model (Fluent simulation software) model analysis oxidation ditch, in the low off-set facility such as (can determine type selecting according to actual needs) of impeller under water that location arrangements necessity of sludge settling takes place easily of flow velocity, prevent the generation of sludge settling phenomenon in the oxidation ditch, guarantee the safe operation of oxidation ditch.
The invention has the beneficial effects as follows that this method is one to be enclosed within the Carrousel oxidation ditch condition control condition and the operation method of realizing efficient stable synchronous nitration and denitrification process.This method at first at the water inlet component characteristics, preliminary operation scheme and the control condition of determining oxidation ditch, again according to the dynamic rule of amount of inlet water and water quality, further determine the operation control condition of oxidation ditch, and finally draw the control strategy of oxidation ditch steady running simultaneously.The present invention be applied to build oxidation ditch process upgrading, optimize the optimization design of operation and newly-built oxidation ditch process, promote the oxidation ditch process wastewater treatment efficiency.
Description of drawings
Fig. 1 oxidation ditch structural representation.
Fig. 2 oxidation ditch synchronous nitration and denitrification processing condition synoptic diagram, wherein HRT-hydraulic detention time; The DO-dissolved oxygen concentration; The MLSS-activated sludge concentration.
Fig. 3 Controlling System is carried out the steering order logical schematic.
The entry water quality daily variation of Fig. 4 Changsha second sewage work
The entry water yield daily variation of Fig. 5 Changsha second sewage work
Fig. 6 Changsha second sewage work's process form
Fig. 7 oxidation ditch dynamic operation control strategy example
Fig. 8 simulates the effluent quality result
Embodiment
The present invention is directed to the daily variation rule of the sewage quality of the water quality characteristics of China's different regions municipal effluent and same water factory and the water yield and a kind of oxidation ditch process treatment process that changes based on influent quality is provided.
Figure 1 shows that the basic structure synoptic diagram of Carrousel oxidation ditch.The structure of this oxidation ditch device is that at one end one dividing wall of two channel middle settings UNICOM, parallel 8 constitutes, dividing wall 8 head positions at non-UNICOM end are provided with first aerator 2 and the 3rd aerator 3, in UNICOM's end dividing wall 8 interior passageways second aerator 7 are set; Near first aerator, 2 ends water outlet 1 is housed at upper channel, first water-in 4 is housed and is provided with DO monitoring point 3 near the 3rd aerator 2 ends, second water-in 6 is housed at the lower channel middle part at lower channel.
The operating load of determining entry according to the water yield and the water quality situation of entry at first, determine the COD load and the ammonia nitrogen loading of system's operation respectively, the MLSS of Adjustment System, make the ammonia nitrogen loading and the COD load of system's operation can satisfy the given burden requirement of Fig. 3, simultaneously again according to shown in Figure 2 be the suitable dissolved oxygen levels that operational conditions is determined system's operation, tentatively determine the running status of system.Again according to the water yield of entry every day and the changing conditions of water quality, logical relation according to Fig. 3, determine several operation phase of oxidation ditch in a day by Fig. 2 and the given standard load scope of Fig. 3, determine the processing parameter of system operation according to the operational conditions of several operation phase, its operation phase, stable condition was as shown in Figure 7 really.Utilize systems simulation software ODSS simplation verification operation strategy whether can guarantee system safety operation at last, and finally determine control strategy.
Below in conjunction with Fig. 4,5,6, with the actual Carrousel oxidation ditch process of Changsha second sewage work be applied as example (a-f represents the aerator of different positions respectively), the specific implementation process that this method is used is described.
1. entry water quality components and entry law-analysing
24 hours sampling analysis are carried out in the water inlet of sewage work, adopt national standard method that each water-quality guideline of water inlet is carried out determination and analysis.Analytical results as shown in Figure 4 and Figure 5, wherein the average entry water yield of entry is 75000m
3/ d.Entry is southern regional typical urban sewage quality characteristics, entry COD, SS, NH
3-N, NO
3-N and TP concentration daily mean of concentration are respectively 272.3mg/L, 105mg/L, 16.6mg/L, 6.0mg/L and 1.8mg/L, and the organic concentration of entry is very low, according to above-mentioned steps 2) shown in condition, be judged as the not enough water quality of synchronous nitration and denitrification carbon source.
2. determine the technology operation scheme
According to the process form of Changsha second sewage work, the entry position is defined as the position shown in Fig. 6, be set at the dissolved oxygen monitoring location near the water outlet.
3. determine system's operating load
According to the operational conditions of technology, determine system's operating load, the sludge concentration of determining system under the stable condition is 2g/L, hydraulic detention time is 5-6 hour.
4. determine the running status of system
At the water yield and the change of water quality rule of entry, according to the scope of the standard load of formula (3) (4), and the logical relation of Fig. 3, the operational process of system is divided into 4 different running statuses, the change of state condition of system is as shown in Figure 7.
5. the operating performance of proofing state is also determined tactful implementation method
The operation strategy that the utilization simulation software is determined carries out simplation verification, analog result as shown in Figure 8, system reaches stable operating performance preferably, the total nitrogen of water outlet can reach below the 20mg/L.Determine concrete operational conditionss such as concrete backflow, aeration control, concrete operation process control data as shown in Figure 7.
6. determine the allocation plan of aerator and impeller
According to the technology operating parameter of aerator and the fluid condition analysis of oxidation ditch, the allocation plan of the aerator of oxidation ditch and plug-flow and unlatching strategy under concrete definite different running statuses, there is not unlatching then to need to open the impeller under water of corresponding ditch section as the aerator of crossing corresponding ditch section, make the flow velocity in the ditch remain on certain level, the unlatching scheme of aerator as shown in Figure 7.
Claims (6)
1. an oxidation ditch process treatment process that changes based on influent quality is characterized in that this method mainly comprises the steps:
1) reads into water data, influent quality composition and water inlet dynamic change characteristic are analyzed
At first determine the water quality components of water inlet, analyze the acquisition dynamic change characteristic again from the water inlet data that read; Specifically water inlet is carried out 24 hours sampling and measuring of the water yield and water quality, water yield data can obtain according to the routine monitoring equipment of water factory, and the component index and the water quality data that need to determine comprise TCOD, SCOD, NH
3-N, TN, TP, its monitoring method can be finished according to the water quality monitoring (WQM) standard method of routine, or obtains by being equipped with good online water quality and quantity Monitoring equipment in advance.This part is to determine the precondition of oxidation ditch realization synchronous nitration and denitrification strategy;
2) determine the technology operation scheme
Read the component index and the water quality data determined of into water data acquisition according to step 1), earlier the water quality characteristics of water inlet is judged, if the water concentration of municipal sewage plant's water inlet can satisfy following condition: TCOD＞300mg/L fully, TCOD/TN＞10, SCOD/TCOD＞0.7, then can be defined as for the oxidation ditch synchronous nitration and denitrification be the sufficient water quality of carbon source to this water concentration; On the contrary, if can not satisfy condition as above simultaneously, then can be defined as for the inadequate water quality of oxidation ditch synchronous nitration and denitrification process carbon source, the inadequate water quality of carbon source, from the position water inlet of second water-in of oxidation ditch device, for the sufficient water quality of carbon source, in order to guarantee the water outlet effect, then need in advance, from the position water inlet of first water-in of oxidation ditch device the water inlet position;
3) determine system's operating load
According to influent quality and the water yield data that monitoring obtains, determine the hydraulic detention time HRT of oxidation ditch operation and the sludge concentration MLSS of normal operating condition, the ammonia nitrogen loading and the COD that are calculated under the acquisition system operational conditions by formula (1) and formula (2) load; And, determine the dissolved oxygen concentration of system's normal running (operation) conditions according to the temperature condition of working time with according to the load range of system;
4) determine the dynamic control condition of oxidation ditch
The amount of inlet water that obtains according to as above monitoring and water quality day dynamic changing data, determine the entry rangeability of every day according to formula (1) and (2), to be scaled the entry load variations of system, again with (3) 0.12＜N
COD(gCOD/gMLSS*d)＜0.15; (4) 0.02＜N
NH3(gNH
3/ gMLSS*d)＜0.06 given standard load scope is compared, the system sludge concentration that load criterion is not met the standard operating load scope time period is adjusted, make the loading condiction of this period can satisfy (3) and (4) given standard load condition, simultaneously again according to the sludge concentration of determining, according to formula (5) Q
Oxygen requirement(kgO
2/ h)=(0.55-0.80) MLSS estimates the system's oxygen requirement under this operational conditions; According to the changing conditions of intaking every day, determine the running status condition of 2-4 different steps every day, with this oxidation ditch is moved and dynamically control; Wherein MLSS is for getting big coefficient, get less coefficient when sludge concentration being low when sludge concentration is high;
Running status deterministic process as above, need follow following conditional relationship:
I. at first according to the water yield and the water quality situation of water inlet, calculate the COD organic loading of water inlet,, determine the suitable operation sludge concentration of oxidation ditch then according to payload;
Ii. again according to the water yield and the water quality situation of water inlet, calculate the NH of water inlet
3Organic loading is then according to NH
3The organic loading size, final definite operation sludge concentration; In the running status process, with NH
3Compare with the load of COD, be as the criterion with higher that of burden requirement;
Iii. according to the final running status of determining, judge the sludge concentration scope, then according to the platform number and the rotating speed that aerator begins of determining of sludge concentration, and definite spoil disposal time;
5) modeling verification condition scope and definite tactful specific implementation method
Determine after basic the technology operation form and working order, the operation sewage treatment process modeling (ODSS of system, Tsing-Hua University's exploitation), the preliminary processing condition of determining are carried out analog calculation, operating performance to as above state of the art is carried out simulation and forecast, according to predicting the outcome, system's operational process is pressed the steering order of process control condition and carried out, and the problem that exists in the process is revised;
Dynamic change at water inlet, oxidation ditch is divided into several different control stage and running statuses, by sludge concentration in the dynamic controlled oxidation ditch and corresponding aeration rate, realization is to the adjusting and the control of oxidation ditch operational conditions, sludge concentration is regulated and can be realized by the big flow returned sluge of moment, load variations to water inlet is regulated, and dissolved oxygen is regulated then and can be achieved by the control of aerator being opened platform number and aeration watt level.This control strategy needs intrasystem active sludge reserves bigger, will carry out spoil disposal in the less operation phase of sludge back flow quantity simultaneously;
6) determine that aerator opens the arrangement of scheme and impeller
After determining the unlatching strategy of aerator, utilize the fluidised form of hydrodinamical model (Fluent simulation software) model analysis oxidation ditch, according to the oxidation ditch fluidised form model of setting up, fluidised form to oxidation ditch is carried out model analysis, determine to be provided with off-set facility such as impeller under water in the position of necessity, prevent the generation of sludge settling phenomenon in the oxidation ditch, guarantee the safe operation of oxidation ditch.
2. according to the described oxidation ditch process treatment process that changes based on influent quality of claim 1, it is characterized in that, the described monitor that formerly is provided with is a STIP-SCAN All-in-One sewage quality on-line monitoring instrument, ISCO/STIP buoy type nh 3-n analyser and ISCO/STIP buoy type phosphoric acid salt analyser.
3. determine the technology operation scheme according to described variation of claim 1, it is characterized in that the sufficient water quality of carbon source adopts different water inlet positions with the insufficient water quality of carbon source based on influent quality.
4. according to the described oxidation ditch process treatment process that changes based on influent quality of claim 1, it is characterized in that the organic concentration load with entry is a control condition, described ammonia nitrogen loading and COD load calculation formula are as follows:
(1) N
COD(gCOD/gMLSS*d)=Q
Go into(m
3/ d) * C
COD(mg/L)/MLSS (mg/L)/V (m
3);
(2) N
NH3(gNH
3/ gMLSS*d)=Q
Go into(m
3/ d) * C
NH3(mg/L)/MLSS (mg/L)/V (m
3).
5. according to the described oxidation ditch process treatment process that changes based on influent quality of claim 1, it is characterized in that, the steering order implementation of described process control condition is as follows, at first according to the entry water yield and change of water quality, calculate the ammonia nitrogen and the COD load range of different time sections, the reference standard loading condiction, sludge concentration to different steps is regulated, to be divided into 2-4 different operation phase every day, make that ammonia nitrogen in the oxidation ditch and COD load at any time can both the conformance with standard load ranges, and finally determine the dissolved oxygen conditions of different steps.
6. determine according to the control of the described oxidation ditch aeration machine of claim 1 and the arrangement of impeller, the aeration demand that it is characterized in that utilizing the control of aerator to regulate oxidation ditch, guarantee dissolved oxygen conditions, and utilize the fluidised form control of the layout assisted oxidation ditch of impeller under water, satisfy the needs of oxidation ditch safe operation, the control scheme determination need be by the method for hydrodynamic analogy analysis.
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| CN101830556A (en) * | 2010-04-16 | 2010-09-15 | 安徽南风环境工程技术有限公司 | Method for processing sludge depositing in continuous ring-type reaction tank |
| CN101955308A (en) * | 2010-11-03 | 2011-01-26 | 上海泓济环保工程有限公司 | Combined SBR-Carrousel oxidation ditch high-efficiency denitrification process |
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| CN102491507A (en) * | 2011-12-13 | 2012-06-13 | 西部水务集团(贵州)有限公司 | Method and device of automatic control for sequencing batch type treatment process at non-DO state |
| CN102629134B (en) * | 2012-04-23 | 2014-06-25 | 重庆大学 | Urban sewage treatment Orbal oxidation ditch industrial toxic pollutant impact resistance regulation and control system |
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| CN103043784A (en) * | 2013-01-25 | 2013-04-17 | 北京大学 | Multi-dimensional multi-phase multi-process coupling analog method of activated sludge sewage treatment |
| CN103043784B (en) * | 2013-01-25 | 2013-10-23 | 北京大学 | Multi-dimensional multi-phase multi-process coupling analog method of activated sludge sewage treatment |
| CN111087073A (en) * | 2020-01-08 | 2020-05-01 | 北控水务(中国)投资有限公司 | Sewage treatment biochemical aerobic control system and method based on synchronous nitrification and denitrification mechanism |
| CN111087073B (en) * | 2020-01-08 | 2024-06-18 | 北控水务(中国)投资有限公司 | Sewage treatment biochemical oxygen demand control system and method based on synchronous nitrification and denitrification mechanism |
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