CN101851046B - Device for deep treatment and complete recovery of coking wastewater and application method thereof - Google Patents
Device for deep treatment and complete recovery of coking wastewater and application method thereof Download PDFInfo
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- CN101851046B CN101851046B CN201010204363A CN201010204363A CN101851046B CN 101851046 B CN101851046 B CN 101851046B CN 201010204363 A CN201010204363 A CN 201010204363A CN 201010204363 A CN201010204363 A CN 201010204363A CN 101851046 B CN101851046 B CN 101851046B
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Abstract
The invention discloses a device for deep treatment and complete recovery of coking wastewater and an application method thereof. The device comprises a pretreatment system and a biochemical treatment system and is characterized in that an outlet of coking wastewater after pretreatment and biochemical treatment is connected with a membrane bioreactor; the water outlet of the membrane bioreactor is connected with an oxidation treatment component; the water outlet of the oxidation treatment system is connected with a reverse osmosis membrane treatment component; one water outlet of the reverse osmosis membrane treatment component is connected with a concentrated water evaporation and crystallization system; and the other water outlet of the reverse osmosis membrane treatment component is connected with a recycling water tank. The invention combines the technologies of biochemical treatment, oxidation, membrane separation and evaporation for deep treatment of the coking wastewater and realizes zero emissions. Therefore, the device and the application method are a novel treatment device and a novel application method for degradation of various pollutants in the coking wastewater and complete recovery of water after treatment.
Description
Technical field
The present invention relates to the technology for treating industrial waste water field, relate in particular to a kind of coking wastewater deep treatment and full reclamation set and application method thereof.
Background technology
At present; Treatment of Coking Effluent generally adopts A/O biological denitrificaion treatment technology, handles back sewage quality index and can reach national specified discharge standard, and part is back to wet quenching, dedusting, coal gas water seal equal turbidity circulating water system and makes make up water; And the advanced treatment of coking chemical waste water is generally adopted means such as sand filtration, biological filter, coagulating treatment; Although water outlet COD is controlled at about 100mg/L, suspension content can not satisfy and produce water purification water water quality requirement about 30mg/L; The employing activated carbon filtration that has can be removed COD and suspended substance in the water effectively, and COD is dropped to below the 60mg/L, and suspension content but does not almost have treatment effect to deliquescent solid saltiness below 5mg/L, so this technology does not have promotional value.Must adopt reverse osmosis membrane to separate in order to remove soluble solid; And the liquid concentrator after separating can't discharge because of COD and salt height; Unique place to go is to be sprayed onto coal yard or as the make up water of wet quenching; But the water of coal yard is limited, and many coke-oven plants have changed dry quenching(of coke) into, so need a Treatment of Coking Effluent reuse and reach the technology of zero release.
Summary of the invention
Technical problem to be solved by this invention provides a kind of coking wastewater deep treatment device, and this device can reduce all kinds of pollutant loads such as COD and suspended substance in the waste water significantly, and coking chemical waste water is carried out advanced treatment and reuse, makes system realize zero release.
Technical problem to be solved by this invention realizes through following technical scheme:
A kind of coking wastewater deep treatment and full reclamation set; Comprise pretreatment system and biochemical treatment system; It is characterized in that: said device also comprise by membrane bioreactor ((Membrane BioReactor, MBR), oxidization processing system and reverse osmosis membrane processing system and dense water evaporation and crystallization system;
Outlet through the coking chemical waste water after pre-treatment and the biochemical treatment is connected with said MBR membrane bioreactor; The water outlet of said membrane bioreactor is connected with said oxidization processing system; The water outlet of said oxidization processing system is connected water outlet after reverse osmosis feedwater pump and HPP series connection pressurization with said reverse osmosis membrane processing system; A water outlet of said reverse osmosis membrane processing system is connected with said dense water evaporation and crystallization system; Another outlet of said reverse osmosis membrane processing system is connected with the reuse water tank.
Said pretreatment system comprises grease removal tank, equalizing tank and the flotation cell that connects successively; Biochemical treatment system comprises anaerobic pond, anoxic pond, Aerobic Pond and reflux sedimentation tank, and the water outlet in bio anaerobic pond joins through the water-in of anoxic pond, Aerobic Pond and reflux sedimentation tank and MBR membrane bioreactor successively.
Said MBR membrane bioreactor belongs to hollow fiber ultrafiltration membrane, the immersion structure; The said MBR membrane bioreactor work period is 3 minutes, 30 seconds intermittently, and required suction force is generally-0.01～-0.04MPa, filtering accuracy 0.5 μ m, crossing water flux is 10～15L/m
2.hr.
Said oxidization processing system adopts ozone, ydrogen peroxide 50, chlorine or Youxiaolin to handle waste water.
Described reverse osmosis membrane filtration adopts two cover systems, and said two cover systems are connected in series.
The said first cover reverse osmosis system WP, 2～3.5MPa, filtering accuracy 0.001 μ m; The liquid concentrator of the first cover reverse osmosis system gets into the second cover reverse osmosis system, system works pressure 3.5～4.0Mpa.Final liquid concentrator accounts for below 10% of the entire treatment water yield; The liquid concentrator water quality of the said second cover reverse osmosis system is: CODcr≤450mg/L, saltiness≤40000mg/L.
Described coking chemical waste water working temperature is 18～30 ℃.
Said anaerobic pond has related parameter to be: hydraulic detention time 8～12h, P are 1mg/L, and water temperature is 30 ℃;
Said anoxic pond has related parameter: hydraulic detention time 16～20h, sewage backflow are than 2～3 times, and P is 1mg/L, 25～30 ℃ of water temperatures, pH value 7～8;
Said Aerobic Pond has related parameter: hydraulic detention time 32～36h, and 2～3 times of return sludge ratios, water outlet phosphorus content 0.5～1mg/L, 25～30 ℃ of water temperatures, PH 7～8, dissolved oxygen 2～4mg/L.
The application method of described coking wastewater deep treatment and full reclamation set is characterized in that this method comprises following process step:
(1) pre-treatment: treatment facility comprises grease removal tank, flotation cell and equalizing tank, and the influent quality of coking chemical waste water is: CODcr≤4000mg/L, phenol≤650mg/L, CN
-≤15mg/L, oil≤50mg/L, NH
3-N :≤250mg/L, SS≤300mg/L, PH 7～8; Remove heavy oil and oil in water emulsion in the waste water through grease removal tank, flotation cell and equalizing tank; Regulate the ununiformity of the various coking chemical waste water water yields and water quality, coking chemical waste water after pre-treatment in the water quality CODcr clearance 5～10%, oil≤10mg/L;
(2) biochemical treatment: treatment facility comprises anaerobic pond, anoxic pond, Aerobic Pond and reflux sedimentation tank, and the water outlet in bio anaerobic pond joins through the water-in of anoxic pond, Aerobic Pond and reflux sedimentation tank and MBR membrane bioreactor successively;
(3) MBR Membrane Bioreactor for Wastewater Treatment: MBR belongs to hollow fiber ultrafiltration membrane, the immersion structure, and all kinds of bacterial classifications of its efficient crown_interception are effectively removed corresponding pollutent, and avoid the loss of mud; Water-quality guideline is CODcr≤150mg/L, NH after the MBR Membrane Bioreactor for Wastewater Treatment
3-N≤5mg/L, SS (suspended substance)≤1mg/L, phenol≤0.5mg/L, prussiate≤0.5mg/L;
(4) oxide treatment: ozone, ydrogen peroxide 50, chlorine or Youxiaolin are adopted in oxidation; Organism in the intensive oxidative degradation water; Reduce COD, colourity in the waste water, water-quality guideline is CODcr≤80mg/L, SS (suspended substance)≤1mg/L, phenol≤0.3mg/L, prussiate≤0.3mg/L, percent of decolourization>=50% after the oxide treatment;
(5) reverse osmosis membrane processing: reverse osmosis membrane filtration adopts two cover systems, and said two cover systems are connected in series, the said first cover reverse osmosis system WP, 2～3.5MPa, filtering accuracy 0.001 μ m; The liquid concentrator of the first cover reverse osmosis system gets into the second cover reverse osmosis system, system works pressure 3.5～4.0Mpa.Final liquid concentrator accounts for below 10% of the entire treatment water yield; The liquid concentrator water quality of the said second cover reverse osmosis system is: CODcr≤450mg/L, saltiness≤40000mg/L; The water-quality guideline of water outlet: CODcr≤20mg/L, phenol≤0.2mg/L, prussiate≤0.2mg/L, NH after reverse osmosis membrane processing
3-N≤3mg/L, oil can not detect, SS can not detect, PH6.5～7.5, saltiness≤150mg/L, hardness≤10mg/L are (with CaCO
3Meter);
(6) dense water evaporative crystallization is handled: the liquid concentrator after the reverse osmosis membrane processing utilizes evaporative crystallization, and the water of condensation makes system accomplish zero release as the make up water of recirculating cooling water system;
Preferred ozone of oxygenant or ydrogen peroxide 50 in the said step (4); When adopting chlorine or Youxiaolin, need before RO, add sodium sulfite anhy 96 or S-WAT neutralizes, to protect the RO film.
The present invention has following advantage:
The method that the present invention adopts biochemistry, oxidation to add that membrane separation technique and evaporation combine is carried out advanced treatment and is reached zero release coking chemical waste water, be a kind of with each pollutant in the coking chemical waste water degraded and will handle the processing new technology of back water complete-reclaiming; Adopt MBR to improve the biochemical sludge concentration and the volumetric loading of biochemical reaction tank, the cancellation coagulating treatment has been saved occupation of land; But the water outlet direct reuse is realized the utilization again of water resources and the zero release of coking chemical waste water in producing clean circulating water system as make up water.
Description of drawings
Fig. 1 is a device schematic flow sheet of the present invention
As shown in the figure, 1-MBR membrane bioreactor, 2-oxidization processing system, 3-reverse osmosis membrane processing system, the dense water evaporation and crystallization system of 4-, 5-reuse water tank, 6-pretreatment system, 7-biochemical treatment system.
Embodiment
Below in conjunction with Figure of description the present invention is described further.
A kind of coking wastewater deep treatment and full reclamation set comprise pretreatment system and biochemical treatment system, it is characterized in that: said device also comprises by membrane bioreactor, oxidization processing system and reverse osmosis membrane processing system and dense water evaporation and crystallization system;
Outlet through the coking chemical waste water after pre-treatment and the biochemical treatment is connected with said MBR membrane bioreactor; The water outlet of said membrane bioreactor is connected with said oxidization processing system; The water outlet of said oxidization processing system is connected water outlet after reverse osmosis feedwater pump and HPP series connection pressurization with said reverse osmosis membrane processing system; A water outlet of said reverse osmosis membrane processing system is connected with said dense water evaporation and crystallization system; Another outlet of said reverse osmosis membrane processing system is connected with the reuse water tank.
Said pretreatment system comprises grease removal tank, equalizing tank and the flotation cell that connects successively; Biochemical treatment system comprises anaerobic pond, anoxic pond, Aerobic Pond and reflux sedimentation tank, and the water outlet in bio anaerobic pond joins through the water-in of anoxic pond, Aerobic Pond and reflux sedimentation tank and MBR membrane bioreactor successively.
Said MBR membrane bioreactor belongs to hollow fiber ultrafiltration membrane, the immersion structure; The said MBR membrane bioreactor work period is 3 minutes, 30 seconds intermittently, and required suction force is generally-0.01～-0.04MPa, filtering accuracy 0.5 μ m, crossing water flux is 10～15L/m
2.hr.
Said oxidization processing system adopts ozone, ydrogen peroxide 50, chlorine or Youxiaolin to handle waste water.
Described reverse osmosis membrane filtration adopts two cover systems, and said two cover systems are connected in series.
The said first cover reverse osmosis system WP, 2～3.5MPa, filtering accuracy 0.001 μ m; The liquid concentrator of the first cover reverse osmosis system gets into the second cover reverse osmosis system, system works pressure 3.5～4.0Mpa.Final liquid concentrator accounts for below 10% of the entire treatment water yield; The liquid concentrator water quality of the said second cover reverse osmosis system is: CODcr≤450mg/L, saltiness≤40000mg/L.
Described coking chemical waste water working temperature is 18～30 ℃.
Said anaerobic pond has related parameter to be: hydraulic detention time 8～12h, P are 1mg/L, and water temperature is 30 ℃;
Said anoxic pond has related parameter: hydraulic detention time 16～20h, sewage backflow are than 2～3 times, and P is 1mg/L, 25～30 ℃ of water temperatures, pH value 7～8;
Said Aerobic Pond has related parameter: hydraulic detention time 32～36h, and 2～3 times of return sludge ratios, water outlet phosphorus content 0.5～1mg/L, 25～30 ℃ of water temperatures, PH 7～8, dissolved oxygen 2～4mg/L.
The application method of described coking wastewater deep treatment and full reclamation set is characterized in that this method comprises following process step:
(1) pre-treatment: treatment facility comprises grease removal tank, flotation cell and equalizing tank, and the influent quality of coking chemical waste water is: CODcr≤4000mg/L, phenol≤650mg/L, CN
-≤15mg/L, oil≤50mg/L, NH
3Heavy oil and oil in water emulsion in the waste water are removed through grease removal tank, flotation cell and equalizing tank in-N :≤250mg/L, SS≤300mg/L, PH7～8, regulate the ununiformity of the various coking chemical waste water water yields and water quality.This flotation cell is provided with the air supporting medicine system flocculation agent and coagulant aids is added wherein favourable further removal oils of flotation cell and suspended substance.Coking chemical waste water after pre-treatment in the water quality CODcr clearance 5～10%, oil≤10mg/L;
(2) biochemical treatment: treatment facility comprises anaerobic pond, anoxic pond, Aerobic Pond and reflux sedimentation tank, and the water outlet in bio anaerobic pond joins through the water-in of anoxic pond, Aerobic Pond and reflux sedimentation tank and MBR membrane bioreactor successively; The bio anaerobic pond is provided with biochemical medicine system nutritive salt and alkali is added wherein, and utilizes Aeration fan to give the oxygen supply of biology aerobic pond.
(3) Membrane Bioreactor for Wastewater Treatment: MBR belongs to hollow fiber ultrafiltration membrane, and the immersion structure utilizes film district blower fan to give MBR membrane bioreactor air feed simultaneously, and all kinds of bacterial classifications of the efficient crown_interception of MBR are effectively removed corresponding pollutent, and avoid the loss of mud; Water-quality guideline is CODcr≤150mg/L, NH after the MBR Membrane Bioreactor for Wastewater Treatment
3-N≤5mg/L, SS (suspended substance)≤1mg/L, phenol≤0.5mg/L, prussiate≤0.5mg/L;
(4) oxide treatment: ozone, ydrogen peroxide 50, chlorine or Youxiaolin are adopted in oxidation; Organism in the intensive oxidative degradation water; Reduce COD, colourity in the waste water, water-quality guideline is CODcr≤80mg/L, SS (suspended substance)≤1mg/L, phenol≤0.3mg/L, prussiate≤0.3mg/L, percent of decolourization>=50% after the oxide treatment; Preferred ozone of oxygenant or ydrogen peroxide 50 in this step; When adopting chlorine or Youxiaolin, need before RO, add sodium sulfite anhy 96 or S-WAT neutralizes, to protect the RO film.
(5) reverse osmosis membrane processing: reverse osmosis membrane filtration adopts two cover systems, and said two cover systems are connected in series, the said first cover reverse osmosis system WP, 2～3.5MPa, filtering accuracy 0.001 μ m; The liquid concentrator of the first cover reverse osmosis system gets into the second cover reverse osmosis system, system works pressure 3.5～4.0Mpa.Final liquid concentrator accounts for below 10% of the entire treatment water yield; The liquid concentrator water quality of the said second cover reverse osmosis system is: CODcr≤450mg/L, saltiness≤40000mg/L; The water-quality guideline of water outlet: CODcr≤20mg/L, phenol≤0.2mg/L, prussiate≤0.2mg/L, NH after reverse osmosis membrane processing
3-N≤3mg/L, oil can not detect, SS can not detect, PH6.5～7.5, saltiness≤150mg/L, hardness≤10mg/L are (with CaCO
3Meter);
(6) dense water evaporative crystallization is handled: the liquid concentrator after the reverse osmosis membrane processing utilizes evaporative crystallization, and the water of condensation makes system accomplish zero release as the make up water of recirculating cooling water system.
The unit type that relates among the present invention all can be purchased according to wastewater treatment capacity.
For example:, produce coking chemical waste water 91m for producing 1700000 tons of scale coke-oven plants of coke per year
3/ h, recirculated water sewer 67m
3/ h, handling the water yield so is 158m
3/ h.Biochemical system adopts A/O internal recycle biological denitrificaion treatment technology, and biochemical treatment and MBR treat effluent amount are 158m
3/ h, water-quality COD Cr≤150mg/L, NH
3-N≤5mg/L, SS≤5mg/L, phenol≤0.5mg/L, prussiate≤0.5mg/L reach national comprehensive discharge secondary standard.And then through oxidizer unit; Completion is handled the oxygenolysis that is difficult to pollutents such as biological degradation COD; Water outlet is after reverse osmosis feedwater pump and HPP series connection pressurization; Get into reverse-osmosis membrane element, be separated to macromolecule contaminant in the water and being partly dissolved property solids content in the liquid concentrator, reverse osmosis membrane assembly produces the water water-quality guideline and reaches CODCr≤20mg/L, phenol≤0.2mg/L, prussiate≤0.2mg/L, NH
3-N≤3mg/L, oil can not detect, SS can not detect, PH6.5～7.5, saltiness≤150mg/L, hardness≤10mg/L are (with CaCO
3Meter), satisfy " urban sewage reutilization one process water water quality " requirement (GB/T19923-2005) simultaneously.The reverse osmosis unit water production rate accounts for handles about 90% of the water yield, is 142m
3/ h is back to and produces clean circulating water system as make up water.Isolating liquid concentrator accounts for handles about 10% of the water yield, is about 16m
3/ h adopts evaporative crystallization, and the crystalline solid can send the refuse tip, and the water of condensation that evaporation unit produces can be used as the make up water of recirculating cooling water system equally, makes system accomplish zero release.
Claims (7)
1. a coking wastewater deep treatment and full reclamation set comprise pretreatment system and biochemical treatment system, it is characterized in that: said device also comprises by membrane bioreactor, oxidization processing system and reverse osmosis membrane processing system and dense water evaporation and crystallization system;
Outlet through the coking chemical waste water after pre-treatment and the biochemical treatment is connected with said membrane bioreactor; The water outlet of said membrane bioreactor is connected with said oxidization processing system; The water outlet of said oxidization processing system is connected with HPP with the reverse osmosis feedwater pump successively, and the HPP water outlet is connected with said reverse osmosis membrane processing system;
A water outlet of said reverse osmosis membrane processing system is connected with said dense water evaporation and crystallization system; Another outlet of said reverse osmosis membrane processing system is connected with the reuse water tank;
Described reverse osmosis membrane processing system adopts two cover systems, and said two cover systems are connected in series;
The said first cover reverse osmosis system WP, 2～3.5MPa, filtering accuracy 0.001 μ m; The liquid concentrator of the first cover reverse osmosis system gets into the second cover reverse osmosis system, system works pressure 3.5～4.0Mpa; Final liquid concentrator accounts for below 10% of the entire treatment water yield.
2. coking wastewater deep treatment as claimed in claim 1 and full reclamation set is characterized in that: said pretreatment system comprises grease removal tank, equalizing tank and the flotation cell that connects successively; Biochemical treatment system comprises anaerobic pond, anoxic pond, Aerobic Pond and reflux sedimentation tank, and the water outlet in bio anaerobic pond joins through the water-in of anoxic pond, Aerobic Pond and reflux sedimentation tank and membrane bioreactor successively.
3. coking wastewater deep treatment as claimed in claim 1 and full reclamation set is characterized in that: said membrane bioreactor belongs to hollow fiber ultrafiltration membrane; The said membrane bioreactor work period is 3 minutes, 30 seconds intermittently, and required suction force be-0.01～-0.04MPa, filtering accuracy 0.5 μ m, the mistake water flux is 10～15L/m
2.hr.
4. coking wastewater deep treatment as claimed in claim 1 and full reclamation set is characterized in that: said oxidization processing system is the pneumatogen that contains ozone, ydrogen peroxide 50, chlorine or Youxiaolin.
5. the application method of a coking wastewater deep treatment as claimed in claim 1 and full reclamation set is characterized in that this method comprises following process step:
(1) pre-treatment: treatment facility comprises grease removal tank, flotation cell and equalizing tank, and the water inlet of coking chemical waste water is removed heavy oil and oil in water emulsion in the waste water through grease removal tank, flotation cell and equalizing tank, regulates the ununiformity of the various coking chemical waste water water yields and water quality;
(2) biochemical treatment: treatment facility comprises anaerobic pond, anoxic pond, Aerobic Pond and reflux sedimentation tank, and the water outlet in bio anaerobic pond joins through the water-in of anoxic pond, Aerobic Pond and reflux sedimentation tank and MBR membrane bioreactor successively;
(3) Membrane Bioreactor for Wastewater Treatment: belong to the hollow fiber ultrafiltration membrane of immersion, all kinds of bacterial classifications of its efficient crown_interception are effectively removed corresponding pollutent, and avoid the loss of mud;
(4) oxide treatment: ozone, ydrogen peroxide 50, chlorine or Youxiaolin are adopted in oxidation, and the organism in the intensive oxidative degradation water reduces chemical oxygen demand, colourity in the waste water;
(5) reverse osmosis membrane processing: reverse osmosis membrane filtration adopts two cover systems, and said two cover systems are connected in series, the said first cover reverse osmosis system WP, 2～3.5MPa, filtering accuracy 0.001 μ m; The liquid concentrator of the first cover reverse osmosis system gets into the second cover reverse osmosis system, system works pressure 3.5～4.0Mpa; Final liquid concentrator accounts for below 10% of the entire treatment water yield;
(6) dense water evaporative crystallization is handled: the liquid concentrator after the reverse osmosis membrane processing utilizes evaporative crystallization, and the water of condensation makes system accomplish zero release as the make up water of recirculating cooling water system.
6. oxygenant is ozone or ydrogen peroxide 50 in the application method of coking wastewater deep treatment according to claim 5 and full reclamation set, said step (4); When adopting chlorine or Youxiaolin, need before r-o-, add sodium sulfite anhy 96 or S-WAT neutralizes, to protect reverse osmosis membrane.
7. the application method of coking wastewater deep treatment according to claim 5 and full reclamation set is characterized in that: described coking chemical waste water working temperature is 18～30 ℃;
Said anaerobic pond has related parameter to be: hydraulic detention time 8～12h, P are 1mg/L, and water temperature is 30 ℃;
Said anoxic pond has related parameter: hydraulic detention time 16～20h, sewage backflow are than 2～3 times, and P is 1mg/L, 25～30 ℃ of water temperatures, p H value 7～8;
Said Aerobic Pond has related parameter: hydraulic detention time 32～36h, and 2～3 times of return sludge ratios, water outlet phosphorus content 0.5～1mg/L, 25～30 ℃ of water temperatures, pH 7～8, dissolved oxygen 2～4mg/L.
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| CN201010204363A CN101851046B (en) | 2010-06-21 | 2010-06-21 | Device for deep treatment and complete recovery of coking wastewater and application method thereof |
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| CN201010204363A CN101851046B (en) | 2010-06-21 | 2010-06-21 | Device for deep treatment and complete recovery of coking wastewater and application method thereof |
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| CN101851046B true CN101851046B (en) | 2012-10-03 |
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