CN103771651A - Treatment method for reusing municipal wastewater treatment plant effluent as water supply for industrial boiler - Google Patents
Treatment method for reusing municipal wastewater treatment plant effluent as water supply for industrial boiler Download PDFInfo
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Abstract
The invention relates to a treatment method for reusing municipal wastewater treatment plant effluent as water supply for an industrial boiler, and the method is applicable to treatment of municipal wastewater treatment plant effluent with high COD, chroma and high salt content. The municipal wastewater treatment plant effluent containing a large proportion of industrial wastewater and subjected to biochemical treatment is used as the object, which is treated by the units of lime softening, coagulation deposition turbidity removal, ozone oxidation decoloration and biodegradability improvement, aerobic membrane biological treatment, filtration, ultrafiltration and reverse osmosis desalination, and the treated effluent is directly reused as water supply for the industrial boiler. The method provided by the invention can realize reuse of the municipal wastewater treatment plant effluent with high COD, chroma and salt content as supply water for the industrial boiler, reaches the purposes of resource utilization of sewage and industrial water saving, and is in line with the requirements of circular economy and clean production.
Description
Technical field
The present invention relates to the treatment process that a kind of municipal wastewater treatment plant effluent reuse does industrial boiler water-supply, be applicable to municipal wastewater treatment plant effluent reuse that COD, colourity and salts contg are higher and do the processing of industrial boiler water-supply.
Background technology
Along with the shortage of water resources, municipal wastewater recycling has become the effective way that solves process water bottleneck.But for some the municipal wastewater treatment plant take industry as main city, cities and towns, development area, because industrial sewage proportion in water inlet is higher, in the industrial sewage Hui Shi municipal wastewater treatment plant water inlets such as particularly pharmacy, fermentation, printing and dyeing, papermaking, organic chemical industry, COD, colourity, salts contg, hardness, basicity etc. are all higher, and be difficult for biological degradation, after existing routine biochemistry treatment process is processed, although BOD
5processed to 10mg/L, even below 5mg/L, but water outlet COD(chromium method, lower with) still up to more than 100mg/L, and present high chroma (more than 200 degree), high conductivity (more than 3000 μ s/cm), high rigidity (more than 350mg/L, with CaCO
3meter, lower with), high alkalinity is (more than 350mg/L, with CaCO
3meter, lower with), high turbidity (more than 20NTU) character, cannot meet reuse and do industrial feedwater quality requirement.
For further processing and the recycling of municipal wastewater, conventionally adopt the physico-chemical processes of " coagulation+clarification+filtration+sterilization " to carry out secondary treatment to municipal wastewater treatment plant secondary biochemical effluent at present, upright stone tablet as high in Beijing and northern river Sewage Plant, Ji Malan river, development area, Dalian Sewage Plant, the north suburb, Changchun and western suburb Sewage Plant, Qingdao Tuan Dao Sewage Plant, Xi'an Deng Jia spring Sewage Plant, Shenyang northern new railway city Sewage Plant etc., middle water after treatment mainly as power plant cooling water, road water and spill, the water such as River Landscape, city are used mixedly." coagulation+clarification+filtration+sterilization " belongs to a kind for the treatment of process of conventional ripening, its object is mainly used for suspended substance, the turbidity of water in removal and kills disease carrying germ in water, but the clearance to dissolved matter is lower, can not realize removing of COD, colourity, total dissolved solid and hardness, basicity, can not be applicable to the Treatment for Reuse of the municipal wastewater treatment plant water outlet that COD, colourity and salts contg are higher.Based on municipal wastewater treatment plant effluent quality and reuse requirement, the Sewage Plant such as Tianjin discipline village, development area, the north suburb have adopted " continuous Microfiltration+reverse osmosis " reuse treatment process, by the water outlet of municipal wastewater treatment plant is carried out to desalting treatment, effluent quality after treatment can reach or be better than fresh water level, can be done process water by reuse preferably.But be subject to the requirement of reverse osmosis membrane operational conditions, this processing requirement influent quality is strictly controlled, as COD≤50mg/L, total hardness+total alkalinity≤600mg/L, colorimetry-turbidity etc. also must be controlled at lower value.Therefore, for those, with the higher municipal wastewater treatment plant secondary biochemical treatment water outlet of industrial sewage proportion, because COD, colourity, hardness, basicity etc. are all higher, this technique can not be suitable for.In order to guarantee that municipal wastewater treatment plant effluent reuse does process water, CN101544448A has proposed a kind of urban sewage recycling in the method for recirculated cooling water and boiler water feeding, the externally discharged waste water that municipal sewage plant is met after second-stage treatment to emission standard is sent into MBBR (MBBR), in MBBR, BOD and ammonia nitrogen are degraded, water outlet enters coagulation, air-dissolving air-float, multi-medium filtering processing successively, and water outlet after treatment is reuse after ultrafiltration and reverse osmosis desalination processing again.The method is before sewage enters two films, to rely on MBBR and add flocculation medicament to remove bio-degradable organic matter and the larger molecular organics in water, make COD, suspended substance and turbidity in water quality meet two film water inlet control requirements, but the method, because not possessing the effective removal means to solubility difficult for biological degradation organic matter, colourity and hardness, basicity, is unsuitable for the Treatment for Reuse of the municipal wastewater treatment plant secondary biochemical treatment water outlet higher with industrial sewage proportion.CN102249491A has proposed municipal sewage plant's secondary treatment yielding water advanced treatment apparatus and technique, by to effluent adopting denitrification bio-filter, ultrafiltration membrance filter, ozone Oxidation Treatment, reach the object that removes total nitrogen, reduces turbidity, colourity and part COD, realize the object of water reuse in municipal administration.But this processing method is still mainly applicable to low strength COD, colourity and lower concentration saline sewage, because there is no biochemical treatment facility behind its ozone oxidation unit, its function is also mainly used in decolouring and removes a small amount of COD, do not possess the removal means to solubility difficult for biological degradation organic matter, high chroma and hardness, basicity, total salt, after processing, water outlet can not reuse be done process water, particularly oiler feed.CN1796314A proposes a kind of city sewage deep treatment method, by to effluent adopting coagulation and filtration, ozone oxidation, biologic active carbon filtration, reverse-osmosis treated, reach and remove difficult degradation microorganism remaining in municipal sewage plant's secondary biochemical effluent, bacterium, virus, colourity etc., realize the object of water security reuse in municipal administration.But this processing method is mainly used in pollutent degree of depth trace, remaining in conventional sanitary sewage disposal factory secondary biochemical effluent to be removed, and is applicable to sewage of low concentration, as the advanced treatment of COD≤30mg/L, colourity≤40 degree.CN101182084A proposes combined treating method for reclaimed water reuse, by municipal wastewater treatment plant secondary biochemical effluent being adopted to ozone pre-oxidation coagulation, precipitation, sand filtration, millipore filtration, ozone oxidation, charcoal absorption, disinfecting, realize water reuse in municipal administration.But this processing method treatment scheme is long, and what processing unit all adopted is physico-chemical processes, rely on medicament, ozone dosage completely and sacrifice charcoal absorption capacity to complete removing of pollutent and colourity, be therefore applicable to low strength COD, colourity sewage disposal; And for high concentration COD, high chroma sewage disposal, the processing costs of the method and energy consumption will significantly increase.In addition, the method is the removal function to the specific conductivity in sewage, total salt, basicity, hardness not, and after processing, water outlet cannot meet reuse and do the water quality requirement of oiler feed.
Based on above analysis, for with the higher municipal wastewater treatment plant secondary biochemical treatment water outlet of industrial sewage proportion, because difficult for biological degradation COD, colourity, hardness, basicity, specific conductivity are higher, there is no at present reliable processing reuse, particularly reuse and do the Technology of industrial boiler water-supply.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes a kind of municipal wastewater treatment plant effluent reuse and does the treatment process of industrial boiler water-supply, is applicable to municipal wastewater treatment plant effluent reuse that COD, colourity and salts contg are higher and does the processing of industrial boiler water-supply.The inventive method can realize containing the higher municipal wastewater treatment plant effluent reuse of COD, colourity and salts contg and do industrial boiler water-supply, reaches sewage recycling utilization and Industrial Water Saving object, meets the requirement of recycling industries and clean production etc.
The treatment process that a kind of municipal wastewater of the present invention treatment plant effluent reuse does industrial boiler water-supply is mainly divided into six processing units:
(1) lime is softening processes, and fully mixes in line mixer from the bio-chemical effluent of municipal wastewater treatment plant with milk of lime, makes calcium salt, magnesium salts and milk of lime generation chemical precipitation in water;
(2) coagulating sedimentation processing, step (1) combined sewage after treatment directly enters coagulative precipitation tank, under the coagulating agent adding and the effect of remaining milk of lime coagulant aids, the throw out in water and suspended substance is removed by clarification;
(3) ozone Oxidation Treatment, step (2) sewage after treatment is sent into ozone-oxidizing device processing, by pass into ozone oxidation agent in sewage, make difficult for biological degradation organic matter in sewage be oxidized to the low-molecular material of biodegradability, reach and improve water quality and decolouring object;
(4) aerobic membrane biological process processing, step (3) the laggard oxygen membrane biological process processing of acting charitably in acid for adjusting pH to 6～9 for water outlet after treatment;
(5) filtration treatment, filtration treatment is carried out in step (4) water outlet after treatment;
(6) ultrafiltration and reverse-osmosis treated, ultrafiltration and reverse osmosis desalination processing are carried out in step (5) water outlet after treatment, and effluent reuse after treatment does industrial boiler water-supply.
In the present invention, the lime of step (1) is softening to be processed, and controlling the pH value of sewage after mixing is 9.5～10.5, and milk of lime preferably adopts saturated milk of lime.This processing unit makes calcium salt, the magnesium salts in water react with milk of lime generation chemical precipitation, in precipitation process of coagulation subsequently, is removed, and reduces water hardness.
In the present invention, the sewage of step (2) is 10～30min at the hydraulic detention time of coagulative precipitation tank.PH value keeps weakly alkaline always, need not regulate.Be conventional organic coagulating agent and inorganic coagulant to the coagulating agent adding in coagulative precipitation tank, wherein organic coagulating agent is polyacrylamide, and dosage is 1～5mg/L; Inorganic coagulant can adopt bodied ferric sulfate or iron trichloride, and dosage is 10～30mg/L.By this cell processing, the throw out that in sewage, original suspended substance and step (1) produce can obtain deep removal, goes out water suspension≤10 mg/L, turbidity≤5 NTU, hardness≤150 mg/L, basicity≤150 mg/L, colourity, COD also obtain part removal simultaneously.
In the present invention, the ozone-oxidizing device of step (3) adopts reaction tower or contact-oxidation pool, and ozone oxidation agent is provided by the ozonizer outside treatment unit.The dosage of ozone oxidation agent is 10～50mg/L sewage, is preferably 20～30mg/L sewage; The ozone oxidation agent gas inlet concentration adding is 50～120mg/L, is preferably 100～120mg/L; The hydraulic detention time of sewage in reaction tower or oxidation pond is 10～60min, is preferably 20～30 min.Coagulating sedimentation is processed after rear water outlet fully mixes with ozone oxidation agent in line mixer and is entered reaction tower or oxidation pond by bottom, under the effect of ozone oxidation agent, make the senior oxidizing reactions such as polymer difficult for biological degradation organic matter generation chain rupture in sewage, open loop, two keys, change into low molecule organic matter, reach the object that improves Biodegradability of Wastewater and decolouring, water outlet after treatment enters aerobic biologic membrane processing unit processes by reaction tower or oxidation pond top again.The sewage ozone Oxidation Treatment of this unit remains on weak basic condition carries out, and keeping pH value is 9.5～10.5, does not need to regulate pH value.Under this pH value condition, contribute to ozone decomposed to produce the extremely strong hydroxyl radical free radical of oxidisability, to the difficult for biological degradation thing in sewage and the reaction of color development degree thing generation advanced oxidation, reach decolouring and improve BOD
5/ COD's.By this cell processing, more than the colourity in sewage can remove 70wt%, effluent color dilution≤30 degree; Water outlet COD≤80mg/L, BOD
5/ COD>=0.2.
In the present invention, the aerobic membrane biological process of step (4) can adopt conventional biomembrance process, as MBBR, BAF, bioactive carbon etc.By this cell processing, water outlet COD≤50mg/L, ammonia nitrogen≤5mg/L.
In the present invention, filtration treatment can be selected conventional filter plant, as more medium filter, sand-bed filter, drift sand strainer, millipore filter etc.By sewage is carried out to filtration treatment, make water outlet SS≤20mg/L, turbidity≤5NTU, meet into ultrafiltration and reverse-osmosis treated requirement.
In the present invention, ultrafiltration and the reverse osmosis units of step (6) can be selected conventional ultrafiltration and reverse osmosis equipment.Through step (1)～(5), sewage index after treatment can meet the water inlet index request into ultrafiltration and reverse osmosis, as COD≤50 mg/L, turbidity≤5NTU, hardness≤150mg/L, basicity≤150mg/L, colourity≤30 degree, ammonia nitrogen≤5mg/L, after this cell processing, effluent quality can meet reuse comprehensively and does the water quality requirement reuse of industrial boiler water-supply, and can keep the long-term operation of film.
The inventive method is occupied the bio-chemical effluent of municipal wastewater treatment plant of larger proportion as object take industrial sewage, adopt that lime is softening, coagulating sedimentation, ozone oxidation, aerobic membrane biological process, filtration, ultrafiltration and reverse osmosis combined treatment flow process, the rear water outlet of processing can meet reuse and do the water quality requirement reuse of industrial boiler water-supply, and can guarantee the long-term operation of ultrafiltration and reverse osmosis membrane assembly.The method that the present invention proposes has can realize containing the higher municipal wastewater treatment plant effluent reuse of COD, colourity and salts contg and does industrial boiler feed water, reaches sewage recycling utilization and Industrial Water Saving object, meets the requirement of recycling industries and clean production etc.
Accompanying drawing explanation
Fig. 1 is the treatment process process flow diagram that a kind of concrete municipal wastewater of the present invention treatment plant effluent reuse does industrial boiler water-supply.
Wherein: 1-lime softens line mixer; 2-coagulative precipitation tank; 3-ozone-oxidizing device; 4-aerobic biofilm reactor; 5-strainer; 6-ultra-filtration equipment; 7-reverse osmosis unit.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the inventive method is described.In the present invention, wt% is massfraction.
As shown in Figure 1, bio-chemical effluent from municipal wastewater treatment plant is squeezed into the softening line mixer 1 of lime continuously with pump, fully mix with milk of lime, control the add-on of milk of lime, the pH value of combined sewage is adjusted to 9.5～10.5, after calcium salt, magnesium salts in water reacted with milk of lime generation chemical precipitation, enter coagulative precipitation tank 2 and carry out coagulation clarification separation.In coagulative precipitation tank 2, drop into continuously inorganic coagulant and organic coagulating agent, calcium, magnesium precipitate thing coagulating sedimentation under the effect of coagulating agent and superfluous milk of lime coagulant aids that original suspended substance in sewage and milk of lime softening process are produced, suspended substance, turbidity and hardness in sewage obtain deep removal, and colourity, COD also obtain part removal simultaneously.Water outlet after coagulating sedimentation is sent into ozone-oxidizing device 3 after fully mixing with from the ozone oxidation agent of ozonizer (unlisted in figure) in line mixer (unlisted in figure) and is processed.Under the effect of ozone oxidation agent, polymer difficult for biological degradation organic matter in sewage is directly with ozone and decompose the senior oxidizing reaction such as hydroxyl radical free radical generation chain rupture, open loop, two key oxidations of generation, be converted to low molecule organic matter, the biodegradability of sewage is enhanced, and realizes removing of sewage decoloring and part COD.Water outlet enters aerobic biofilm reactor 4 again and carries out biochemical treatment after adding acid for adjusting pH to 6～9.In aerobic biofilm reactor 4, through ozone-oxidizing device 3 low molecule organic matter after treatment and ammonia nitrogen etc. further by heterotrophic bacterium and nitrifier biological degradation, realize the de-N of the de-C of sewage deep, after subsequent ultrafiltration and feed water by reverse osmosis COD and ammonia control index request, send into strainer 5 and take off suspended substance processing meeting.In strainer 5, suspended sludge and particulate matter etc. after sewage aerobic biochemical treatment are filtered removal, and water outlet enters ultra-filtration equipment 6 and reverse osmosis unit 7 carries out advanced desalination processing.In ultra-filtration equipment 6 and reverse osmosis unit 7, the various low concentration pollutants in sewage, inorganic salt even depth are removed, the water outlet (pure water) obtaining can meet industrial boiler water-supply water quality requirement and carry out reuse.Simultaneously, because sewage enters ultra-filtration equipment 6 and the front perfect preprocessing process above that passed through of reverse osmosis unit 7, main water inlet index COD≤50mg/L, turbidity≤5NTU, hardness≤150mg/L, basicity≤150mg/L, colourity≤30 degree, ammonia nitrogen≤5mg/L, the long-time running that can keep ultrafiltration and reverse osmosis membrane assembly.
In the softening line mixer 1 of lime of the present invention, input milk of lime can directly adopt saturated milk of lime, also can prepare with industrial unslaked lime, and its dosage depends on that the pH value of mixing rear sewage is controlled in 9.5～10.5 scopes, as 300～500mg/L.
The organic coagulating agent adding in coagulative precipitation tank 2 of the present invention is conventional polyacrylamide, and dosage is 1～5mg/L; Inorganic coagulant can adopt bodied ferric sulfate or iron trichloride, and dosage is 10～30mg/L; Sewage need not carry out pH regulator in coagulative precipitation tank 2, and its hydraulic detention time is 10～30min.By this cell processing, in sewage, the softening throw out producing of original suspended particulate and lime can obtain deep removal, can use water suspension≤10mg/L, turbidity≤5NTU, can meet the index request of follow-up ozone oxidation process to influent turbidity and suspended substance control, ozone oxidation efficiency is efficiently brought into play; Simultaneously, utilize this processing unit, in water, calcium, magnesium salts throw out have obtained efficient removal, go out the water hardness and basicity all≤150mg/L, can meet subsequent ultrafiltration and the reverse osmosis index request to water inlet Hardness Control, make ultrafiltration and reverse osmosis membrane assembly can keep long-term operation; Colourity, COD also obtain the removal of 5wt%～40wt% simultaneously.
Ozone-oxidizing device 3 of the present invention is mainly made up of reaction tower or contact-oxidation pool, tail gas destruction facility etc., sewage first evenly mixes with ozone oxidation agent entering before ozone-oxidizing device 3 in line mixer, the dosage of ozone oxidation agent is 10～50mg/L sewage, is preferably 20～30mg/L sewage; The ozone oxidation agent gas inlet concentration adding is 50～120mg/L, is preferably 100～120mg/L; The hydraulic detention time of sewage in reaction tower or oxidation pond is 10～60min, is preferably 20～30min.The ozone oxidation reaction of sewage remains on weak basic condition to carry out, do not regulate pH value, can make like this ozone decompose under weakly alkaline and produce the extremely strong hydroxyl radical free radical of oxidisability, higher to the difficult for biological degradation thing in sewage and colourity oxidation efficiency, reach higher decolouring and improve BOD
5the object of/COD.As more than colourity can remove 70wt%, effluent color dilution≤30 degree; Water outlet COD≤80 mg/L, BOD
5/ COD>=0.2.
Adopt that inventive method adopts to occupy the bio-chemical effluent of municipal wastewater treatment plant of larger proportion with industrial sewage that lime is softening, coagulating sedimentation, ozone oxidation, aerobic membrane biological process, filtration, ultrafiltration and the processing of reverse osmosis combination process, after processing, water outlet can reach reuse and do the water quality requirement reuse of industrial boiler water-supply, and then realized high COD, colourity and salts contg municipal wastewater recycling and Industrial Water Saving object, meet the requirement of recycling industries and clean production etc.
Further illustrate the inventive method and effect below by embodiment.
Adopt treatment process of the present invention to carry out pilot scale to domestic certain municipal wastewater treatment plant secondary biochemical effluent and process test.In this municipal wastewater treatment plant water inlet, because containing the pharmacy sewage of a large amount of difficult for biological degradation, after second-stage treatment, water outlet COD 100～140 mg/L, pH 7.2～7.8, ammonia nitrogen 28～35mg/L, colourity 150～200 are spent, BOD
5be 0～3mg/L, turbidity 10～25 NTU, total hardness 380～520mg/L, total alkalinity 350～400mg/L, specific conductivity 3000～3200 μ s/cm.
Adopt method of the present invention, above-mentioned sewage is carried out to combined treatment test.Sewage disposal scale is 1m
3/ h, main experimental device formation, operational conditions and the treatment effect of each processing unit are in table 1.
The main processing unit of table 1 embodiment 1 forms and treatment effect
| processing unit title | treatment unit scale and chief component | main operational conditions and control parameter | process water outlet or effect |
| lime is softening | line mixer, material PVC. | discharge of sewage 1m 3/ h; Add saturated milk of lime 450mg/L; PH of mixed value 9.8. | influent COD 125mg/L, pH 7.2, ammonia nitrogen 30 mg/L, colourity 175 are spent, BOD 5for 0.8mg/L, turbidity 20NTU, total hardness 450mg/L, total alkalinity 370 mg/L, specific conductivity 3100 μ s/cm. |
| coagulative precipitation tank | pVC material, volume 0.5m 3, built-in agitator stirs coagulating agent. | discharge of sewage 1m 3/ h; Add bodied ferric sulfate 20mg/L, polyacrylamide 3mg/L; PH of mixed value 9.6; Sewage hydraulic detention time 30min. | water outlet COD 108mg/L, pH 9.6, colourity 125 are spent, turbidity 4NTU, total hardness 120mg/L, total alkalinity 108mg/L, SS≤10 mg/L. |
| ozone-oxidizing device | pVC material baffling reaction tank, useful volume 0.3m 3, external ozonizer. | discharge of sewage 1m 3/ h; Ozone dosage 30mg/L, ozone pond entrance concentration 100mg/L; Sewage hydraulic detention time 20min; PH of mixed value 9.7. | water outlet COD 78mg/L, BOD 5for 16.8mg/L, pH 9.4, ammonia nitrogen 26mg/L, colourity 20 are spent. |
| aerobic biofilm reactor | pVC material, BAF reactor, size of main body is: diameter 1416mm, high 5510mm; Interior filling ceramic aggregate biological filtrate; Adopt upflowing water outlet. | discharge of sewage 1m 3/ h; Blast volume 100L/min, water-in regulates water inlet pH value to 7.0 with sulfuric acid. | water outlet COD 45mg/L, BOD 5for 0.8mg/L, pH 6.9, ammonia nitrogen 2.6 mg/L, colourity≤20 degree. |
| strainer | adopt multi-medium filtering post, material synthetic glass, size of main body is: diameter 300mm, high 2350mm; Interior filling quartz sand and ANTHRACITE FILTER MEDIA; Adopt upflowing water outlet. | discharge of sewage 1m 3/ h; Every 2 days anti-cleanings once. | water outlet COD 42mg/L, turbidity 2.8NTU, SS≤20mg/L, pH 6.9, ammonia nitrogen 2.6mg/L, colourity≤20 degree. |
| ultrafiltration+reverse osmosis unit | adopt LG-DOW membrane module; Designing treatment amount 1.0m 3/ h. | operate continuously, water rate 70wt% processed. | delivery turbidity 0.2NTU, COD mn0.26mg/L, ammonia nitrogen 0.3mg/L, specific conductivity 28 μ s/cm, total hardness 3.4mg/L, total alkalinity 4.2mg/L |
After processing by method of the present invention, effluent index can meet reuse does the water quality requirement of oiler feed, i.e. turbidity≤0.3NTU, COD
mn≤ 2mg/L, ammonia nitrogen≤0.5mg/L, specific conductivity≤100 μ s/cm, total hardness≤15mg/L, total alkalinity≤20mg/L, can substitute deionized water as industrial boiler water-supply reuse.
Adopt the treatment unit of embodiment 1, process the sewage similar to embodiment 1, the wastewater treatment efficiency that the operational conditions of change each processing unit obtains is in table 2.
The main processing unit of table 2 embodiment 2 forms and treatment effect
| processing unit title | treatment unit scale and chief component | main operational conditions and control parameter | process water outlet or effect |
| lime is softening | line mixer, material PVC. | discharge of sewage 1m 3/ h; Add saturated milk of lime 500mg/L; PH of mixed value 10.5. | influent COD 140mg/L, pH 7.6, ammonia nitrogen 28 mg/L, colourity 200 are spent, BOD 5for 0.5mg/L, turbidity 15NTU, total hardness 384mg/L, total alkalinity 358 mg/L, specific conductivity 3150 μ s/cm. |
| coagulative precipitation tank | pVC material, volume 0.5m 3, built-in agitator stirs coagulating agent. | discharge of sewage 1m 3/ h; Add bodied ferric sulfate 25mg/L, polyacrylamide 2mg/L; PH of mixed value 10.5; Sewage hydraulic detention time 15min. | water outlet COD 112mg/L, pH 10.5, colourity 125 are spent, turbidity 2.8NTU, total hardness 148mg/L, total alkalinity 136 mg/L, SS≤10mg/L. |
| ozone-oxidizing device | pVC material baffling reaction tank, useful volume 0.3m 3, external ozonizer. | discharge of sewage 1m 3/ h; Ozone dosage 20mg/L, ozone pond entrance concentration 120 mg/L; Sewage hydraulic detention time 30min; PH of mixed value 10.5. | water outlet COD 72mg/L, BOD 5for 19.8mg/L, pH 10.2, ammonia nitrogen 24 mg/L, colourity 20 are spent. |
| aerobic biofilm reactor | pVC material, BAF reactor, size of main body is: diameter 1416mm, high 5510mm; Interior filling ceramic aggregate biological filtrate; Adopt upflowing water outlet. | discharge of sewage 1m 3/ h; Blast volume 100L/min, water-in regulates water inlet pH value to 8.0 with sulfuric acid. | water outlet COD 41mg/L, BOD 5for 0.2mg/L, pH 7.5, ammonia nitrogen 1.3 mg/L, colourity≤20 degree. |
| strainer | adopt multi-medium filtering post, material synthetic glass, size of main body is: diameter 300mm, high 2350mm; Interior filling quartz sand and ANTHRACITE FILTER MEDIA; Adopt upflowing water outlet. | discharge of sewage 1m 3/ h; Every 2 days anti-cleanings once. | water outlet COD 39mg/L, turbidity 2.6NTU, SS≤20 mg/L, pH 7.5, ammonia nitrogen 1.3 mg/L, colourity≤20 degree. |
| ultrafiltration+reverse osmosis unit | adopt LG-DOW membrane module; Designing treatment amount 1.0 m 3/ h. | operate continuously, water rate 70wt% processed. | delivery turbidity 0.2NTU, COD mn0.14mg/L, ammonia nitrogen 0.25 mg/L, specific conductivity 25 μ s/cm, total hardness 3.0mg/L, total alkalinity 4.2mg/L |
After processing by method of the present invention, effluent index can meet reuse does the water quality requirement of oiler feed, i.e. turbidity≤0.3NTU, COD
mn≤ 2mg/L, ammonia nitrogen≤0.5mg/L, specific conductivity≤100 μ s/cm, total hardness≤15mg/L, total alkalinity≤20mg/L, can substitute deionized water as industrial boiler water-supply reuse.
Adopt the treatment unit of embodiment 1, process the sewage similar to embodiment 1, the wastewater treatment efficiency that the operational conditions of change each processing unit obtains is in table 3.
The main processing unit of table 3 embodiment 3 forms and treatment effect
| processing unit title | treatment unit scale and chief component | main operational conditions and control parameter | process water outlet or effect |
| lime is softening | line mixer, material PVC. | discharge of sewage 1m 3/ h; Add saturated milk of lime 0mg/L; PH of mixed value 7.2. | influent COD 107 mg/L, pH 7.2, ammonia nitrogen 29.8 mg/L, colourity 175 are spent, BOD 5be 0.5 mg/L, turbidity 16NTU, total hardness 440 mg/L, total alkalinity 358 mg/L, specific conductivity 3125 μ s/cm. |
| coagulative precipitation tank | pVC material, volume 0.5m 3, built-in agitator stirs coagulating agent. | discharge of sewage 1m 3/ h; Add iron trichloride 30mg/L, polyacrylamide 1mg/L; PH of mixed value 7.5.Sewage hydraulic detention time 30min. | water outlet COD 102 mg/L, pH 7.5, colourity 150 are spent, turbidity 5.8NTU, total hardness 430 mg/L, total alkalinity 136 mg/L.SS≤30 mg/L。 |
| ozone-oxidizing device | pVC material baffling reaction tank, useful volume 0.3m 3, external ozonizer. | discharge of sewage 1m 3/ h; Ozone dosage 30mg/L, ozone pond entrance concentration 100 mg/L; Sewage hydraulic detention time 30min; PH of mixed value 7.5. | water outlet COD 92mg/L, BOD 5for 5.8mg/L, pH 7.3, ammonia nitrogen 16 mg/L, colourity 40 are spent. |
| aerobic biofilm reactor | pVC material, BAF reactor, size of main body is: diameter 1416mm, high 5510mm; Interior filling ceramic aggregate biological filtrate; Adopt upflowing water outlet. | discharge of sewage 1m 3/ h; Blast volume 100L/min, water-in regulates water inlet pH value to 7.0 with sulfuric acid. | water outlet COD 83mg/L, BOD 5for 0.2mg/L, pH 6.9, ammonia nitrogen 2.3 mg/L, colourity≤40 degree. |
| strainer | adopt multi-medium filtering post, material synthetic glass, size of main body is: diameter 300mm, high 2350mm; Interior filling quartz sand and ANTHRACITE FILTER MEDIA; Adopt upflowing water outlet. | discharge of sewage 1m 3/ h; Every 2 days anti-cleanings once. | water outlet COD 72mg/L, turbidity 2.8NTU, SS≤20 mg/L, pH 6.9, ammonia nitrogen 1.3 mg/L, colourity≤40 degree. |
| ultrafiltration+reverse osmosis unit | adopt LG-DOW membrane module; Designing treatment amount 1.0 m 3/ h. | operate continuously, water rate 70wt% processed. | strainer water outlet COD, colourity and total hardness do not meet into two film requirements |
After processing by method of the present invention, effluent index can meet reuse does the water quality requirement of oiler feed, i.e. turbidity≤0.3 NTU, COD
mn≤ 2mg/L, ammonia nitrogen≤0.5mg/L, specific conductivity≤100 μ s/cm, total hardness≤15mg/L, total alkalinity≤20mg/L, can substitute deionized water as industrial boiler water-supply reuse.
Claims (11)
1. municipal wastewater treatment plant effluent reuse does a treatment process for industrial boiler water-supply, it is characterized in that comprising following process:
(1) lime is softening processes, and fully mixes in line mixer from the bio-chemical effluent of municipal wastewater treatment plant with milk of lime, makes calcium salt, magnesium salts and milk of lime generation chemical precipitation in water;
(2) coagulating sedimentation processing, step (1) combined sewage after treatment directly enters coagulative precipitation tank, under the coagulating agent adding and the effect of remaining milk of lime coagulant aids, the throw out in water and suspended substance is removed by clarification;
(3) ozone Oxidation Treatment, step (2) sewage after treatment is sent into ozone-oxidizing device processing, by pass into ozone oxidation agent in sewage, make difficult for biological degradation organic matter in sewage be oxidized to the low-molecular material of biodegradability, reach and improve water quality and decolouring object;
(4) aerobic membrane biological process processing, step (3) the laggard oxygen membrane biological process processing of acting charitably in acid for adjusting pH to 6～9 for water outlet after treatment;
(5) filtration treatment, filtration treatment is carried out in step (4) water outlet after treatment;
(6) ultrafiltration and reverse-osmosis treated, ultrafiltration and reverse osmosis desalination processing are carried out in step (5) water outlet after treatment, and effluent reuse after treatment does industrial boiler water-supply.
2. in accordance with the method for claim 1, it is characterized in that: the softening processing of lime of step (1), controlling the pH value of sewage after mixing is 9.5～10.5.
3. according to the method described in claim 1 or 2, it is characterized in that: the milk of lime in the softening processing of step (1) lime adopts saturated milk of lime.
4. in accordance with the method for claim 1, it is characterized in that: during step (2) coagulating sedimentation is processed, the hydraulic detention time of sewage in coagulative precipitation tank is 10～30min.
5. according to the method described in claim 1 or 4, it is characterized in that: the coagulating agent that step (2) coagulating sedimentation adds in processing is organic coagulating agent and inorganic coagulant, and wherein organic coagulating agent is polyacrylamide, and dosage is 1～5mg/L; Inorganic coagulant is bodied ferric sulfate or iron trichloride, and dosage is 10～30mg/L.
6. in accordance with the method for claim 1, it is characterized in that: the ozone-oxidizing device of step (3) adopts reaction tower or contact-oxidation pool, and ozone oxidation agent is provided by the ozonizer outside treatment unit.
7. according to the method described in claim 1 or 6, it is characterized in that: the dosage of ozone oxidation agent is 10～50mg/L sewage, the gas inlet concentration of ozone oxidation agent is 50～120mg/L; The hydraulic detention time of sewage in reaction tower or oxidation pond is 10～60min.
8. according to the method described in claim 1 or 6, it is characterized in that: the dosage of ozone oxidation agent is 20～30mg/L sewage, the gas inlet concentration of ozone oxidation agent is 100～120mg/L; The hydraulic detention time of sewage in reaction tower or oxidation pond is 20～30min.
9. according to the method described in claim 1 or 6, it is characterized in that: step (3) ozone Oxidation Treatment remains on weak basic condition carries out, keeping pH value is 9.5～10.5.
10. it is characterized in that in accordance with the method for claim 1: the aerobic film biological treatment of step (4) adopts MBBR, BAF or bioactive carbon.
11. in accordance with the method for claim 1, it is characterized in that: step (5) filtration treatment adopts more medium filter, sand-bed filter, drift sand strainer or millipore filter.
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| CN104876403A (en) * | 2015-06-11 | 2015-09-02 | 武汉钢铁(集团)公司 | Process and device for advanced treatment and reuse of coking wastewater |
| CN105174637A (en) * | 2015-10-03 | 2015-12-23 | 中国轻工业长沙工程有限公司 | Pretreatment process for papermaking tail water recycling and zero discharge |
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| CN107973488B (en) * | 2017-11-24 | 2020-08-18 | 华南理工大学 | Method for denitrification treatment of ammonia nitrogen wastewater |
| CN107935303B (en) * | 2017-11-24 | 2020-12-08 | 华南理工大学 | Process for recycling power plant boiler water from municipal secondary effluent |
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| CN110845047A (en) * | 2019-12-13 | 2020-02-28 | 深圳市能源环保有限公司 | Reclaimed water softening and recycling treatment system and method suitable for waste incineration power plant |
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