CN108178305B - Process and device for biological diversification treatment of high-concentration chemical wastewater - Google Patents
Process and device for biological diversification treatment of high-concentration chemical wastewater Download PDFInfo
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- CN108178305B CN108178305B CN201810142057.3A CN201810142057A CN108178305B CN 108178305 B CN108178305 B CN 108178305B CN 201810142057 A CN201810142057 A CN 201810142057A CN 108178305 B CN108178305 B CN 108178305B
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- 239000002351 wastewater Substances 0.000 title claims abstract description 82
- 239000000126 substance Substances 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000020477 pH reduction Effects 0.000 claims abstract description 25
- 239000012528 membrane Substances 0.000 claims abstract description 24
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000001301 oxygen Substances 0.000 claims abstract description 22
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 22
- 238000000605 extraction Methods 0.000 claims abstract description 9
- 239000002071 nanotube Substances 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 6
- 238000006213 oxygenation reaction Methods 0.000 claims description 59
- 239000007789 gas Substances 0.000 claims description 27
- 244000005700 microbiome Species 0.000 claims description 11
- 238000010992 reflux Methods 0.000 claims description 11
- 238000005273 aeration Methods 0.000 claims description 6
- 238000005422 blasting Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 3
- 238000005352 clarification Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract description 2
- 239000005416 organic matter Substances 0.000 abstract description 2
- 238000004062 sedimentation Methods 0.000 abstract description 2
- 239000010865 sewage Substances 0.000 description 9
- 239000003344 environmental pollutant Substances 0.000 description 7
- 231100000719 pollutant Toxicity 0.000 description 7
- 238000001914 filtration Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Natural products OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 231100000331 toxic Toxicity 0.000 description 2
- 230000002588 toxic effect Effects 0.000 description 2
- 231100000419 toxicity Toxicity 0.000 description 2
- 230000001988 toxicity Effects 0.000 description 2
- 239000003403 water pollutant Substances 0.000 description 2
- PXRKCOCTEMYUEG-UHFFFAOYSA-N 5-aminoisoindole-1,3-dione Chemical compound NC1=CC=C2C(=O)NC(=O)C2=C1 PXRKCOCTEMYUEG-UHFFFAOYSA-N 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 150000002366 halogen compounds Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 150000002828 nitro derivatives Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- 239000004094 surface-active agent Substances 0.000 description 1
- 230000004083 survival effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
-
- 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
Abstract
The invention discloses a process for treating high-concentration chemical wastewater in a biological multi-way, which comprises the following steps: the chemical wastewater is homogenized and then sent to an acidification tank by a lifting facility, the water discharged from the acidification tank is sent to an oxygen-filled extraction circulating tank, the water discharged from the oxygen-filled extraction circulating tank after treatment is sent to a membrane bioreactor for mud-water separation, and the water discharged from the membrane bioreactor after treatment is sent to a discharge port and then discharged by a nano tube. The homogenizing pool is used for receiving various pretreated chemical wastewater to perform homogenizing average quantity; adding an acidification strain into the acidification tank to acidify the wastewater, so as to improve the biodegradability of the chemical wastewater; the air stripping circulation process in the oxygen charging air stripping circulation tank can diversify organisms in the wastewater and improve the biological concentration in the wastewater, thereby improving the organic matter removal rate of the wastewater; the membrane bioreactor integrates a secondary sedimentation tank and a clarification tank into a whole, so that the construction cost of the infrastructure facilities can be greatly reduced, and the occupied area can be greatly reduced.
Description
Technical Field
The invention relates to the technical field of materials and environmental engineering, in particular to a process and a device for treating high-concentration chemical wastewater in a biological and diversified manner.
Background
The chemical industry of Zhejiang province is developed, the chemical wastewater has large water quantity (accounting for 14 percent of the total industrial wastewater quantity), and the water quality is complex, and belongs to typical three-high organic wastewater (high organic pollutant, high salt content and high ammonia nitrogen wastewater). The chemical wastewater is characterized in that: (1) The water quality components are complex, the byproducts are more, the reaction raw materials are often solvent substances or compounds with a cyclic structure, and the treatment difficulty of the wastewater is increased; (2) The wastewater has a high contaminant content due to incomplete reaction of the raw materials and the entry of the raw materials, or of the large amount of solvent medium used in the production, into the wastewater system; (3) Many toxic and harmful substances are more, and many organic pollutants in the fine chemical wastewater are toxic and harmful to microorganisms, such as halogen compounds, nitro compounds, dispersing agents or surfactants with bactericidal effect and the like; (4) The biological degradation substances are more, the B/C ratio is low, and the biodegradability is poor; and (5) the chromaticity of the wastewater is high.
In order to improve the pollution problem of the chemical industry, the country has also continuously brought out the wastewater standards of the chemical industry, for example, the "petrochemical industry pollutant emission standard" GB31571-2015, the "inorganic chemical industry pollutant emission standard" GB31573-2015, the "synthetic ammonia industry water pollutant emission standard" GB13458-2013, the "citric acid industry water pollutant emission standard" GB19430-2013, the "coking chemical industry pollutant emission standard" GB16171-2012 and the like implemented in 2015, and the water pollution problem of the chemical industry can be improved to a certain extent by implementing the above standards.
Therefore, chemical enterprises mainly implement the purposes of national energy conservation and emission reduction in two aspects, namely clean production is carried out on production, water is saved, and the water consumption of unit products is reduced; and secondly, the sewage treatment technology is required to be enhanced, the effluent quality is improved, and the reclaimed water is utilized to be reused in production as much as possible, so that the aim of emission reduction is fulfilled.
Disclosure of Invention
The invention provides a process for treating high-concentration chemical wastewater by biological diversification, which solves the technical problem of low biochemical treatment efficiency of chemical wastewater.
A process for treating high-concentration chemical wastewater by biological diversification comprises the following steps:
the chemical wastewater is lifted into an acidification tank by a lifting facility after being homogenized, the water discharged from the acidification tank is sent into an oxygen-filled extraction and circulation tank, the water discharged from the oxygen-filled extraction and circulation tank after being treated is sent into a membrane bioreactor for mud-water separation, and the water discharged from the membrane bioreactor after being treated is sent into a discharge port and then is discharged through a nano tube.
The homogenizing pool is used for receiving various pretreated chemical wastewater to perform homogenizing average quantity; the acidification tank is acidified by hydrolysis to improve the biodegradability of the chemical wastewater; the air stripping circulation process in the oxygen charging air stripping circulation tank can diversify organisms in the wastewater and improve the biological concentration in the wastewater, thereby improving the organic matter removal rate of the wastewater; the membrane bioreactor integrates a secondary sedimentation tank and a clarification tank into a whole, so that the construction cost of the infrastructure facilities can be greatly reduced, and the occupied area can be greatly reduced.
The oxygenation tank receives the acidification tank wastewater and the stripping circulation reflux water simultaneously, so that the oxygenation tank forms a stable wastewater concentration gradient from the beginning to the end, microorganisms in each concentration stage of the wastewater are symbiotic in the oxygenation tank, the types of the microorganisms are diversified, the number of the microorganisms reaches a certain level, and the treatment efficiency of the wastewater reaches an optimal level.
Preferably, the oxygenation gas stripping circulation tank comprises an oxygenation Chi Heqi gas stripping circulation tank, a gas stripping device is arranged in the gas stripping circulation tank, and wastewater at the water outlet end of the oxygenation tank flows back to the water inlet end of the oxygenation tank in a large proportion through the gas stripping device.
Preferably, the stripping device is a plurality of annular aeration pipes which are mutually independently controlled. Is beneficial to the block waste water lifting.
Preferably, the oxygenation tank is externally connected with a blasting facility for oxygenation, and the concentration of dissolved oxygen in the oxygenation tank is controlled to be 2-4 mg/L.
Preferably, the air stripping circulation tank is externally connected with an air blowing facility for oxygenation, and the concentration of dissolved oxygen in the air stripping circulation tank is controlled to be 0.5-1 mg/L.
Preferably, the reflux ratio of the waste water in the stripping circulating pool is 30-1000 times. Further preferably, the reflux ratio is 500 times to 1000 times; still more preferably, the reflux ratio is 500 to 600 times.
Preferably, the hydraulic retention time of the wastewater in the acidification tank and the oxygenation gas stripping circulation tank is 8-12 h and 24-36 h respectively. Further preferably, the hydraulic retention time is 10h and 30h, respectively.
The invention also provides a device for treating high-concentration chemical wastewater by biological diversification, which comprises a homogenizing pool, a lifting facility, an acidification pool, an oxygenation gas stripping circulation pool, a membrane bioreactor, a lifting facility and a discharge port which are sequentially arranged.
Preferably, the oxygenation gas stripping circulation tank comprises an oxygenation tank, a gas stripping circulation tank and a gas stripping device arranged in the gas stripping circulation tank, wherein the gas stripping device is used for refluxing wastewater at the water outlet end of the oxygenation tank to the water inlet end of the oxygenation tank.
Further preferably, the stripping circulation tank is arranged in a semi-circular way around the oxygenation tank and is separated by a partition wall.
Preferably, a membrane group is arranged in the membrane bioreactor, and the wastewater is discharged to a discharge port through a lifting facility externally connected with the membrane group.
Preferably, the stripping device is a plurality of annular aeration pipes which are mutually independently controlled.
Preferably, an aeration pipe network is arranged at the bottom of the oxidation pond.
Preferably, the oxygenation tank is externally connected with an oxygenation facility.
Preferably, the stripping circulation tank is externally connected with an oxygenation facility.
The chemical wastewater after the quality-dividing pretreatment is lifted to an acidification tank through a lifting facility after passing through a homogenizing tank, the biochemical property of the wastewater is improved through acidification hydrolysis, the wastewater enters an oxygen-filled gas-stripping circulation tank after the acidification treatment, and the wastewater enters an oxygenation tank while the wastewater at the tail end of the gas-stripping circulation tank is infused in a large proportion, so that a stable wastewater concentration gradient is formed from the beginning end to the tail end of the oxygenation tank, various microorganisms in each concentration stage of the wastewater are symbiotic in the oxygenation tank, the concentration gradient enables the types of the microorganisms to be diversified, and the stable concentration enables the microorganisms to be diversified, so that the treatment efficiency of the oxygenation gas-stripping circulation tank is 30% -70% higher than that of a common biochemical tank. The wastewater enters the membrane bioreactor for solid-liquid separation after passing through the oxygen-filled extraction circulating tank, and precipitation and filtration are carried out simultaneously, so that the treatment flow is greatly shortened, and the treatment occupied area is saved. The wastewater is discharged after solid-liquid separation through the discharge outlet nano tube after reaching the standard.
Compared with the prior art, the invention has the following beneficial effects:
(1) The process adopts conventional acidifying strains, and can greatly improve the biochemistry of chemical wastewater through the treatment of conventional high-efficiency acidifying strains.
(2) Compared with a common biochemical tank, the oxygenation gas stripping circulation tank adopted by the technology can greatly improve the treatment efficiency, has strong impact resistance, can treat high-concentration raw water, and can greatly reduce the pretreatment cost.
(3) The process adopts large-scale reflux in the oxygen-filling and extracting circulating pool, so that various microorganisms in each concentration stage of the wastewater are symbiotic in the oxygenation pool, the concentration gradient enables the types of the microorganisms to be diversified, and the stable concentration enables the microorganisms to be diversified, so that the biochemical treatment efficiency can be greatly improved.
(4) The membrane bioreactor adopted by the process integrates precipitation and filtration, so that the wastewater treatment process can be greatly shortened, the occupied land of environmental protection facilities can be greatly saved, and the land resources can be saved.
(5) The technology can be used for the matched sewage treatment engineering of newly built chemical enterprises, can be implemented after being modified according to the actual situation of the matched sewage station of the existing chemical enterprises, and has wide application range.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals shown in the drawings are as follows:
1-homogenizing tank 2-first lifting means 3-intensified acidification tank
4-oxygenation tank 5-stripping circulation tank 6-first air blast facility
7 stripping device 8 second blasting facility 9 aeration facility
10-Membrane bioreactor 11-Membrane set 12-second lifting means
13-discharge port
Detailed Description
As shown in fig. 1, a process for treating high-concentration chemical wastewater by biological diversification comprises a homogenizing tank 1, a first lifting facility 2, a reinforced acidification tank 3, an oxygen-filled extraction circulation tank, a membrane bioreactor 10, a second lifting facility 12 and a discharge port 13 which are sequentially arranged, wherein the oxygen-filled extraction circulation tank comprises an oxygenation tank 4, an air-stripping circulation tank 5 and an air-stripping device 7 arranged in the air-stripping circulation tank, the air-stripping circulation tank is arranged in a semi-circular oxygenation tank and is separated by a partition wall, and the air-stripping device 7 adopts a plurality of annular aeration pipes which are controlled independently and are used for refluxing wastewater at the water outlet end of the oxygenation tank to the water inlet end of the oxygenation tank.
The homogenizing pool gathers the pretreated chemical wastewater at one place and homogenizes the uniform quantity.
And the lifting facility lifts the chemical wastewater in the homogenizing pool to the reinforced acidification pool.
The air stripping circulation tank is provided with air by a first air blowing facility 7, which is beneficial to the circulation of the wastewater.
The oxygenation cell is supplied with oxygen by a second blasting means 8.
The process flow of the invention is as follows:
(1) The pretreated chemical wastewater enters a homogenizing tank, the homogenized chemical wastewater enters a reinforced acidification tank by a lifting facility after homogenizing the homogenized chemical wastewater, and the chemical wastewater is hydrolyzed and acidified in the reinforced acidification tank to improve the B/C ratio of the wastewater, so that the toxicity of the wastewater can be greatly reduced, and the subsequent biochemical treatment is facilitated.
(2) The wastewater enters an oxygenation tank after passing through the reinforced acidification tank, and the second blasting facility is utilized to provide dissolved oxygen required by the oxygenation tank, wherein the dissolved oxygen is kept at 2-4 mg/L, so that the survival condition of oxygen-enriched bacteria in the oxygenation tank is ensured. The water inlet end of the oxygenation tank receives a large amount of tail water circulated back by the tail end of the oxygenation tank through the gas stripping circulation tank, and the high-proportion backflow enables the pollutant concentration of the water inlet end of the oxygenation tank to be greatly reduced, so that the treatment of the pollutants by strains is facilitated, and the pollutant concentration of the waste water can be stably reduced. Meanwhile, high-efficiency multi-element strains are added into the oxygenation tank, so that multi-element and quantitative strains in the oxygenation tank are promoted, and the biochemical treatment capacity and efficiency are improved. Wherein the ratio range of the gas stripping circulation quantity and the water inflow is larger, the adjustment can be carried out according to different waste water, and the reflux ratio is 30-1000 times.
(3) After the wastewater is treated by an oxygenation tank and a gas stripping circulation tank, most pollutants are removed, the wastewater enters a membrane bioreactor for mud-water separation and filtration, and effluent is discharged through a discharge port after reaching the standard. Wherein, the membrane bioreactor integrates precipitation and filtration, which can greatly save land cost and greatly reduce operation cost.
Example 1
The process is applied to the reconstruction engineering of a sewage treatment station of a chemical enterprise, the sewage treatment set amount is 1500t/d, and the treatment process flow of the reconstructed sewage station is as follows: pretreatment of wastewater, regulating tank, gas stripping circulation oxygenation tank, membrane bioreactor, discharge well, and sewage treatment plant in park, wherein the effluent water is required to reach the nano tube standard, the concentration of dissolved oxygen in the oxygenation tank is controlled to be 2-4 mg/L, the concentration of dissolved oxygen in the gas stripping circulation tank is controlled to be 0.5-1 mg/L, the reflux ratio is controlled to be about 500 times, and the hydraulic retention time in the acidification tank and the oxygenation tank is about 10 hours and about 30 hours respectively. The quality of the sewage inlet and outlet water and the standard of the nano tube are shown in table 1.
Table 1 water quality of influent water and standard index unit of nano tube for sewage station: mg/L
The quality of the treated effluent is obviously better than the standard of the nano tube, the treatment effect is greatly improved than that before transformation, and the salt content and toxicity of the wastewater are obviously reduced in an auxiliary way. The improvement engineering has obvious emission reduction and economic benefit, and truly achieves the win-win effect of environmental protection benefit and economic benefit of enterprises.
The foregoing is merely illustrative of specific embodiments of the present invention, but the technical features of the present invention are not limited thereto, and any changes or modifications made by those skilled in the relevant art within the scope of the present invention are encompassed by the present invention.
Claims (2)
1. A process for treating high-concentration chemical wastewater by biological diversification is characterized by adopting a device for treating the high-concentration chemical wastewater by biological diversification, wherein the device for treating the high-concentration chemical wastewater by biological diversification comprises a homogenizing tank, a lifting facility, an acidification tank, an oxygenation gas stripping circulation tank, a membrane bioreactor, a lifting facility and a discharge port which are sequentially arranged;
the technology for treating the high-concentration chemical wastewater by biological diversification comprises the following steps:
the chemical wastewater is lifted into an acidification tank by a lifting facility after being homogenized, the water discharged from the acidification tank is sent into an oxygen-filled extraction and circulation tank, the water discharged from the oxygen-filled extraction and circulation tank after being treated is sent into a membrane bioreactor for mud-water separation, and the water discharged from the membrane bioreactor after being treated is sent into a discharge port and then is discharged through a nano tube; the hydraulic retention time of the wastewater in the acidification tank and the oxygenation gas stripping circulation tank is 8-12 h and 24-36 h respectively;
the oxygenation gas stripping circulation tank comprises an oxygenation Chi Heqi gas stripping circulation tank, the gas stripping circulation tank is arranged in a semi-ring mode around the oxygenation tank and separated by a partition wall, a gas stripping device is arranged in the gas stripping circulation tank, the gas stripping device is a plurality of annular aeration pipes which are independently controlled, and wastewater at the water outlet end of the oxygenation tank flows back to the water inlet end of the oxygenation tank in a large proportion through the gas stripping device;
the oxygenation tank is externally connected with a blasting facility for oxygenation, and the concentration of dissolved oxygen in the oxygenation tank is controlled to be 2-4 mg/L;
the air stripping circulating pool is externally connected with an air blowing facility for oxygenation, and the concentration of dissolved oxygen in the air stripping circulating pool is controlled to be 0.5-1 mg/L;
the waste water reflux ratio of the stripping circulating pool is 500-1000 times;
the oxygenation tank receives the waste water from the acidification tank and the stripping circulation reflux water simultaneously, so that the oxygenation tank forms a stable waste water concentration gradient from the beginning to the end, and microorganisms in each concentration stage of the waste water are symbiotic in the oxygenation tank.
2. The process of claim 1, wherein the membrane bioreactor is internally provided with a membrane module, and wastewater is discharged to a discharge port through a lifting facility external to the membrane module.
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| CN201810142057.3A CN108178305B (en) | 2018-02-11 | 2018-02-11 | Process and device for biological diversification treatment of high-concentration chemical wastewater |
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| CN201810142057.3A CN108178305B (en) | 2018-02-11 | 2018-02-11 | Process and device for biological diversification treatment of high-concentration chemical wastewater |
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| CN108178305B true CN108178305B (en) | 2023-10-27 |
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