CN212581728U - Wastewater treatment system for sludge and blue-green algae synergistic deep dehydration - Google Patents
Wastewater treatment system for sludge and blue-green algae synergistic deep dehydration Download PDFInfo
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- CN212581728U CN212581728U CN202021404507.0U CN202021404507U CN212581728U CN 212581728 U CN212581728 U CN 212581728U CN 202021404507 U CN202021404507 U CN 202021404507U CN 212581728 U CN212581728 U CN 212581728U
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Abstract
The utility model provides a sludge and blue algae cooperate advanced dehydration's effluent disposal system, its significance reduces the method of ammonia nitrogen concentration in the waste water, can reduce waste water pH to neutral, reduce follow-up Ca of getting rid of simultaneously2+The amount of chemical agent required for a stage. The system is characterized in that: comprises a regulating tank, a stripping tower, a pH regulating tank, a chemical sedimentation tank, an anaerobic water inlet tank, an upflow sludge blanket anaerobic reactor (UASB), an anoxic tank, an aerobic tank and a secondary sedimentation tank; the bottom of the stripping tower is provided with an air aeration pipeline which is sequentially connected with an acid absorption tank and an air blower, the bottom of the pH adjusting tank is provided with a methane aeration pipeline, the top of the pH adjusting tank is connected with a methane combustion device through a methane pipeline, and the methane aeration pipeline is sequentially connected with a methane combustion deviceConnect draught fan, steady voltage cabinet and UASB, the chemical sedimentation tank top is through sodium carbonate pipeline intercommunication sodium carbonate storage tank.
Description
Technical Field
The utility model relates to a sewage treatment system of mud and blue alga degree of depth dehydration in coordination belongs to the environmental engineering field.
Background
In recent years, the economic efficiency of China is rapidly increased, and the urban industry and urban population are increased year by year, so that the urban industry/domestic sewage treatment capacity is increased year by year. Sludge is an inevitable by-product in the sewage treatment process, and as long as 2016 years and 3 months, more than 3910 urban sewage treatment plants have been built in China, and the sewage treatment capacity reaches 1.67 hundred million m3And d. The annual municipal sludge yield of China can reach 6000-9000 ten thousand tons in 2020. Therefore, sludge treatment has been a major problem in urban environmental pollution.
After being treated by sewage treatment plants, the urban industrial/domestic sewage is discharged into natural water bodies such as lakes, rivers and the like, and the eutrophication degree of the natural water bodies is continuously increased. It is reported that more than 66% of lakes and reservoirs in China belong to eutrophication state, wherein 22% of lakes are in heavy eutrophication and super eutrophication, and 138 areas are more than 10 km285.4% of lakes exceed the eutrophication standard, and the lakes reaching heavy eutrophication account for 40.1%. The Taihu lake is a typical eutrophic lake located at the south end of the delta in the Yangtze river, the nutrition index of the whole Taihu lake is about 62, and the Taihu lake is in a moderate eutrophication state. Lake eutrophication can directly cause blue algae outbreak, which deteriorates water quality and causes urban drinking water crisis.
At present, sludge in China mainly adopts chemical conditioning and plate-and-frame filter pressing dehydration treatment technology, and the sludgeThe water content is directly reduced from 95 percent to 50 to 60 percent, the sludge amount is greatly reduced, and the treated sewage is directly discharged to a sewage treatment plant for treatment. The blue algae is mainly subjected to manual salvage and flocculation precipitation, and the water content can be only reduced to 85-90%. Therefore, the processing difficulty and the processing cost of the blue algae are greatly increased. In recent years, in order to solve the problem of blue algae in Taihu lake, a technology for deep dehydration treatment by combining blue algae and sludge (the application of Chinese utility model patent with publication number CN 110342779A) is developed, the technology can directly reduce the water content of blue algae and sludge to 55% -60% by allocating the dry matter ratio of sludge and blue algae and then by chemical conditioning and plate-and-frame filter pressing dehydration treatment technology, but Ca in sewage generated by dehydration of blue algae and sludge2+And too high a nitrogen concentration.
The Chinese utility model patent application with the publication number of CN110183066A found by search discloses a blue algae deep dehydration wastewater treatment system and a blue algae deep dehydration wastewater treatment process. Wherein the chemical regulation part is used for removing ion Ca in the wastewater by refluxing anaerobic effluent and utilizing carbonate alkalinity in the anaerobic effluent2+Then, the pH value of the wastewater is adjusted to be neutral by acid, and then the wastewater is subjected to biochemical treatment. The biochemical treatment part is to remove COD in the wastewater through an upflow sludge blanket anaerobic reactor and then to carry out nitrification and denitrification by utilizing A/O + MBR. Although the process uses alkalinity in anaerobic effluent to remove Ca from wastewater2+The method of (3) is theoretically possible, but the method removes Ca2+Has limited effect and removes CO in the sewage3 2-Alkalinity causes the alkalinity of the subsequent denitrification process to be insufficient, so that the alkalinity of carbonate needs to be additionally supplemented, the using amount of the medicament is large, and the cost is high; meanwhile, the pH value is adjusted by using hydrochloric acid or sulfuric acid, certain medicament cost exists, and Cl in water is greatly increased-Or SO4 2-Concentration, on the one hand, increases the Cl of the effluent-Excessive risk, on the other hand, under anaerobic conditions, SO4 2-Can compete for hydrogen donor with the methane production reaction and influence the methane production process. In addition, it is considered that the existence of phycotoxin and other substances in the blue algae has chronic inhibition on the nitrification and denitrification processThe denitrification efficiency is low due to the action, and the discharge requirement of the water quality standard of sewage discharged into urban sewers cannot be met.
SUMMERY OF THE UTILITY MODEL
One of the objects of the present invention is to overcome the disadvantages of the prior art, and to provide a wastewater treatment system with sludge and blue-green algae cooperating with deep dehydration, which can significantly reduce the concentration of ammonia nitrogen in wastewater, and can simultaneously reduce the pH of wastewater to neutral, and reduce the subsequent removal of Ca2+The amount of chemical agent required for a stage.
The technical scheme is that the wastewater treatment system for sludge and blue algae synergistic deep dehydration is characterized in that: comprises a regulating tank, a stripping tower, a pH regulating tank, a chemical sedimentation tank, an anaerobic water inlet tank, an upflow sludge blanket anaerobic reactor (UASB), an anoxic tank, an aerobic tank and a secondary sedimentation tank;
the sewage outlet of the sludge and blue algae collaborative dehydration device is connected with the water inlet of the adjusting tank through a pipeline, the water outlet of the adjusting tank is connected with the water inlet at the top of the stripping tower through a pipeline, the water outlet at the bottom of the stripping tower is connected with the water inlet of the pH adjusting tank through a pipeline, the water outlet of the pH adjusting tank is connected with the water inlet of the chemical sedimentation tank through a pipeline, the water outlet of the chemical sedimentation tank is connected with the water inlet of the anaerobic water inlet tank through a pipeline, the water outlet of the UASB is connected with the water inlet of the anoxic tank through a pipeline, the water outlet of the anoxic tank is connected with the water inlet of the aerobic tank through a pipeline, the water outlet of the aerobic tank is respectively connected with the water inlet of the anoxic tank and the water inlet of the secondary sedimentation tank through pipelines, and the bottom of the secondary sedimentation;
the bottom of the air stripping tower is provided with an air aeration pipeline, the air aeration pipeline is sequentially connected with an acid absorption tank and an air blower, the bottom of the pH adjusting tank is provided with a methane aeration pipeline, the top of the pH adjusting tank is connected with a methane combustion device through the methane pipeline, the methane aeration pipeline is sequentially connected with an induced draft fan, a voltage stabilizing cabinet and a UASB, and the top of the chemical sedimentation tank is communicated with a sodium carbonate storage tank through a sodium carbonate pipeline.
Furthermore, the top of the stripping tower is sequentially connected with an alkali absorption tank and a blower through an air exhaust pipeline.
The system of the utility model removes free ammonia molecules by blowing the wastewater (pH is more than or equal to 12) with strong basicity in the blow-off tower through air after sludge and blue algae are deeply dehydrated in coordination, thereby greatly reducing the ammonia nitrogen concentration before denitrification and nitrification, and even under the inhibiting action of algal toxins, the wastewater can still meet the sewage discharge town sewer water quality standard after being treated by the system of the utility model; introducing the generated biogas into a pH adjusting tank by adding UASB, and introducing CO in the biogas2Effect of (2) realizing Ca in the wastewater2+Partial precipitation and reduction of the pH value of the wastewater to neutrality, and simultaneously the addition amount of sodium carbonate in the chemical calcium removal stage is reduced.
Drawings
Fig. 1 is a system flow diagram of the present invention.
Detailed Description
A wastewater treatment system for sludge and blue algae synergistic deep dehydration is shown in figure 1 and comprises a regulating tank, a stripping tower, a pH regulating tank, a chemical sedimentation tank, an anaerobic water inlet tank, an upflow sludge blanket anaerobic reactor (UASB), an anoxic tank, an aerobic tank and a secondary sedimentation tank;
the sewage port of the sludge and blue algae cooperative dehydration device is connected with the water inlet of the regulating tank through a pipeline, the water outlet of the regulating tank is connected with the water inlet at the top of the stripping tower through a pipeline, the water outlet at the bottom of the stripping tower is connected with the water inlet of the pH regulating tank through a pipeline, the water outlet of the pH regulating tank is connected with the water inlet of the chemical sedimentation tank through a pipeline, the water outlet of the chemical sedimentation tank is connected with the water inlet of the anaerobic water inlet tank through a pipeline, the water outlet of the UASB is connected with the water inlet of the anoxic tank through a pipeline, the water outlet of the anoxic tank is connected with the water inlet of the aerobic tank through a pipeline, the water outlet of the aerobic tank is respectively connected with the water inlet of the anoxic tank and the water inlet of the secondary sedimentation tank;
the bottom of the stripping tower is provided with an air aeration pipeline, the air aeration pipeline is sequentially connected with an acid absorption tank and an air blower, the top of the stripping tower is sequentially connected with an alkali absorption tank and the air blower through an air exhaust pipeline, the bottom of the pH adjusting tank is provided with a biogas aeration pipeline, the top of the pH adjusting tank is connected with a biogas combustion device through the biogas pipeline, the biogas combustion device is specifically a torch, the biogas aeration pipeline is sequentially connected with an induced draft fan, a voltage stabilizing cabinet and a UASB, and the top of the chemical sedimentation tank is communicated with a sodium carbonate storage tank.
Designing water quantity: 3600m3/d。
(1) The design parameters of the regulating reservoir are adjusted,
designing the size: 54 x 40 x 5.5m,
quantity: 1 seat.
(2) The design parameters of the stripping tower are as follows,
designing the size: Φ 4.2 × 11.2m,
quantity: 3, the number of the medicine is less than that of the medicine.
(3) PH adjusting pool
Designing the size: 20X 5.5m,
quantity: 2 pieces of the Chinese herbal medicines.
(4) The design parameters of the chemical sedimentation tank are as follows,
designing the size: 20X 5.5m,
quantity: 2 pieces of the Chinese herbal medicines.
(5) The design parameters of the anaerobic water inlet tank,
designing the size: 40 is multiplied by 20 by 5.5m,
quantity: 1 piece.
(6) The design parameters of the UASB are,
designing the size: phi 10 x 20m,
quantity: 2 pieces of the Chinese herbal medicines.
(7) The design parameters of the anoxic tank are set,
designing the size: 15 is multiplied by 20 by 5.5m,
quantity: 2 pieces of the Chinese herbal medicines.
(8) The design parameters of the aerobic tank are as follows,
designing the size: 11 is multiplied by 20 by 5.5m,
quantity: 2 pieces of the Chinese herbal medicines.
(9) The design parameters of the secondary sedimentation tank are determined,
designing the size: phi 150 x 3m,
quantity: 1 piece.
A wastewater treatment method for sludge and blue algae synergistic deep dehydration comprises the following steps:
secondly, the wastewater treated by the regulating tank is pumped into the top of the stripping tower, and air passes through the acid absorption tank through the blower and the pipeline and then is pumped into an air aeration pipeline at the bottom of the stripping tower. As a large amount of lime (CaO) is added before the sludge and the blue algae are subjected to synergistic deep dehydration, the pH of the wastewater is very high (the pH is more than or equal to 12), and the wastewater is strongly alkaline. Therefore, the ammonia nitrogen in the wastewater is converted into ammonium ions (NH)4 +) And free ammonia molecules (NH)3) Consists of the following components: NH (NH)4 + + OH- QUOTE 
NH3 + H2O, blowing a large amount of air through a blower, removing carbon dioxide, and forming convection with the wastewater in a (2) stripping tower to remove NH in the wastewater3The molecules are brought into the gas phase by the air after the carbon dioxide is removed, so that ammonium ions (NH) in the wastewater are generated4 +) The concentration is reduced, and meanwhile, the pH of part of the wastewater is reduced; the ratio of the aeration rate of the blower to the wastewater amount is 2000:1, the alkali liquor in the acid absorption tank is sodium hydroxide solution, and the mass concentration is 20%;
thirdly, the wastewater treated by the stripping tower is pumped into a pH adjusting pool and passes through a draught fan and a pipelineIntroducing marsh gas in the pressure stabilizing cabinet into a pH adjusting tank, wherein the introducing amount of the marsh gas in the pH adjusting tank is 30m3Lowering the pH value of the wastewater to be neutral; carbon dioxide (CO) contained in biogas2) Will react with hydroxyl ions (OH) in the wastewater-) Calcium ion (Ca)2+) Formation of calcium carbonate precipitate (CaCO)3) To remove hydroxyl ions (OH) in the wastewater-) And part of calcium ion (Ca)2+) Wherein the wastewater pH can be lowered to neutrality;
fourthly, the wastewater treated by the pH adjusting tank is pumped into a chemical sedimentation tank, and sodium carbonate is added into the chemical sedimentation tank through a sodium carbonate storage tank; calcium ion (Ca) in wastewater2+) Directly with carbonate ion (CO)3 2-) Calcium carbonate precipitates are formed. And finally, treating the dehydrated sludge through sludge discharge pipelines and discharge of a pH tank and a chemical sedimentation tank.
Fifthly, pumping the supernatant of the wastewater treated by the chemical sedimentation tank into an anaerobic water inlet tank;
pumping the wastewater treated by the anaerobic water inlet tank into UASB (upflow anaerobic sludge blanket), so that organic matters in the wastewater are converted into methane under the action of anaerobic microorganisms, storing the methane generated by the UASB in a pressure stabilizing cabinet, wherein the UASB is an upflow anaerobic sludge blanket reactor;
seventhly, pumping the wastewater treated by UASB and sludge-water mixed liquor obtained after nitrification in an aerobic tank into an anoxic tank for denitrification, wherein NO isXIs reduced to N2The reflux quantity of the reflux opening of the aerobic tank is 300 percent;
The utility model discloses a sludge and blue alga in coordination with the treatment effect of degree of depth dehydration waste water as follows 1.
TABLE 1
Although the present invention has been disclosed in the context of preferred embodiments, it is not intended to be limited to the embodiments shown, but is capable of modifications and variations in those embodiments as will occur to those skilled in the art. Any modification and change made without departing from the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (2)
1. A wastewater treatment system for sludge and blue algae synergistic deep dehydration is characterized by comprising an adjusting tank, a stripping tower, a pH adjusting tank, a chemical sedimentation tank, an anaerobic water inlet tank, an upflow sludge bed anaerobic reactor, an anoxic tank, an aerobic tank and a secondary sedimentation tank;
the wastewater port of the sludge and blue algae cooperative dehydration device is connected with the water inlet of the regulating tank through a pipeline, the water outlet of the regulating tank is connected with the water inlet at the top of the stripping tower through a pipeline, the water outlet at the bottom of the stripping tower is connected with the water inlet of the pH regulating tank through a pipeline, the water outlet of the pH adjusting tank is connected with the water inlet of the chemical sedimentation tank through a pipeline, the water outlet of the chemical sedimentation tank is connected with the water inlet of the anaerobic water inlet tank through a pipeline, the water outlet of the anaerobic water inlet tank is connected with the water inlet of the upflow sludge blanket anaerobic reactor through a pipeline, the water outlet of the upflow sludge blanket anaerobic reactor is connected with the water inlet of the anoxic tank through a pipeline, the water outlet of the anoxic tank is connected with the water inlet of the aerobic tank through a pipeline, the water outlet of the aerobic tank is respectively connected with the water inlet of the anoxic tank and the water inlet of the secondary sedimentation tank through pipelines, and the bottom of the secondary sedimentation tank is connected with the water inlet of the aerobic tank through a pipeline;
the bottom of the air stripping tower is provided with an air aeration pipeline, the air aeration pipeline is sequentially connected with an acid absorption tank and an air blower, the bottom of the pH adjusting tank is provided with a methane aeration pipeline, the top of the pH adjusting tank is connected with a methane combustion device through a methane pipeline, the methane aeration pipeline is sequentially connected with an induced draft fan, a pressure stabilizing cabinet and an up-flow sludge bed anaerobic reactor, and the top of the chemical sedimentation tank is communicated with a sodium carbonate storage tank through a sodium carbonate pipeline.
2. The wastewater treatment system for sludge and blue-green algae synergistic deep dehydration as claimed in claim 1, wherein the top of said stripping tower is connected with an alkali absorption tank and a blower in turn through an air exhaust pipeline.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111807626A (en) * | 2020-07-16 | 2020-10-23 | 无锡国联环保科技股份有限公司 | Wastewater treatment system and process for sludge and blue-green algae synergistic deep dehydration |
| CN116332396A (en) * | 2023-02-23 | 2023-06-27 | 上海环境卫生工程设计院有限公司 | Landfill leachate recycling treatment method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111807626A (en) * | 2020-07-16 | 2020-10-23 | 无锡国联环保科技股份有限公司 | Wastewater treatment system and process for sludge and blue-green algae synergistic deep dehydration |
| CN116332396A (en) * | 2023-02-23 | 2023-06-27 | 上海环境卫生工程设计院有限公司 | Landfill leachate recycling treatment method |
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