CN102320706A - System for deep recovery and treatment of coking wastewater biochemical effluent - Google Patents
System for deep recovery and treatment of coking wastewater biochemical effluent Download PDFInfo
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- CN102320706A CN102320706A CN201110190811A CN201110190811A CN102320706A CN 102320706 A CN102320706 A CN 102320706A CN 201110190811 A CN201110190811 A CN 201110190811A CN 201110190811 A CN201110190811 A CN 201110190811A CN 102320706 A CN102320706 A CN 102320706A
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Abstract
The invention relates to a system for deep recovery and treatment of coking wastewater biochemical effluent. The system comprises a subsystem composed of a membrane bioreactor and a multi-medium filter as well as a two-stage reverse osmosis subsystem composed of a nanofiltration unit and a reverse osmosis unit. The system has the beneficial effects that: (1) a pretreatment process composed of the membrane bioreactor used as a substitute for a biochemical secondary sedimentation tank and the multi-medium filter is used for replacing sedimentation, coagulation and filtration, ultrafiltration and other traditional processes; and (2) a two-stage reverse osmosis device composed of the nanofiltration unit (especially a nanofiltration membrane) and a common reverse osmosis membrane is used for further removing organic matters and inorganic salt, so that effluent can reach the industrial makeup water standard, the system has high recovery rate, and the membrane cleaning period and the membrane life are prolonged; and by combining the membrane bioreactor, multi-medium filter, nanofiltration and reverse osmosis, the deep recovery and treatment is facilitated, the practical application is stronger, the system is stable to operate, the operating cost is extremely low, and no overlapping and interval exist among the fore and rear processes adopted by the system.
Description
Technical field
The present invention relates to Technologies of Coke Plant Wastewater Treatment, relate in particular to a kind of coking chemical waste water bio-chemical effluent degree of depth recycling processing system.
Background technology
Coking chemical waste water contains a large amount of hardly degraded organic substances, ammonia nitrogen in high density, volatile phenol, cyanogen, SCN-etc. usually, is the bigger a kind of trade effluent of intractability.Coking chemical waste water mainly adopts AO method, A at present
2O method etc. is carried out biochemical treatment, and these have had certain removal effect to pollutent, but still exists bio-chemical effluent (COD), cyanogen higher, and inorganic salt content (TDS) is than problems such as height, thereby influences standard wastewater discharge and reuse.Through constantly improving and attempting, preprocessing means such as materialization, ultrafiltration have been set up in the design of coking chemical waste water bio-chemical effluent degree of depth reuse treatment process behind biochemical secondary sedimentation basins mostly, get into reverse osmosis unit again and handle.There are several problems in above process program: (1) bio-chemical effluent COD is still higher; Pretreatment technology can't address this problem; Therefore reverse osmosis membrane causes the reverse osmosis unit fluctuation of service easily by organic contamination, and reverse osmosis membrane frequent cleaning (1-2 week), life-span reduce; And producing water ratio (or recovery) is lower than 60%, some system even can't long-time running; (2) owing to adopt physico-chemical process, pre-treatment need be added a large amount of medicaments, causes ton water treatment running cost higher (some even＞10 yuan of/ton water); (3) in addition, dosing is flux matched can not accomplish fully automated, causes the frequent backwash of ultrafiltration, and this has then further reduced the recovery (ultrafiltration itself promptly has 10% reduction to the recovery) of system.
For this reason, the novel process of existing a lot of coking waste water reuses is developed, and for example increases ozone, normal temperature and pressure electrolytic oxidation etc., and main purpose is in order to solve the still higher problem of coking chemical waste water bio-chemical effluent organic cod.But these novel procesies not only facility investment are high, and working cost also very high (one ton of water of the processing that has even up to dozens of yuan).In sum, the main purpose of coking waste water reuse is a conserve water resource and energy-saving and cost-reducing, and appropriate treatment process must satisfy method environmental friendly principle reasonable, with low cost.
Summary of the invention
To above defective, the present invention provides that a kind of system is stable, effluent quality reaches the extremely low coking chemical waste water bio-chemical effluent degree of depth recycling processing system technology of reuse requirement, running cost.(1) through utilizing membrane bioreactor (MBR) to substitute biochemical second pond; Perhaps adopt the immersed microfiltration transformation to have biochemical second pond now; And and more medium filter (MMF) composition pretreatment technology, thereby replace multiple tracks traditional technologys such as deposition, coagulation and filtration and ultrafiltration.(2) through utilizing nanofiltration (particularly feed separation technological process adopted nf membrane) and common reverse osmosis membrane to be combined into the two-pass reverse osmosis device.
Above-mentioned technology can effectively be resisted coking chemical waste water biochemical treatment outlet water organic substance COD, (TDS) is higher for inorganic salt; Water outlet can reach industrial make up water standard; System can keep high-recovery (＞67%) for a long time, and is stable, and film cleaning interval and membrane lifetime are all prolonged at double.For realizing above-mentioned purpose, the present invention adopts following technical scheme:
A kind of coking chemical waste water bio-chemical effluent degree of depth recycling processing system comprises the pretreatment technology that membrane bioreactor (perhaps immerse decline, ultra-filtration equipment) and more medium filter are formed, and the two-pass reverse osmosis technology of nano-filtration unit and reverse osmosis units composition.
The inlet tube and outlet tube of said membrane bioreactor is connected with biochemistry pool and raw water box respectively; The rising pipe of said raw water box is provided with more medium filter; Said more medium filter rising pipe be linked in sequence successively nano-filtration unit, intermediate water tank and reverse osmosis units finally get into reverse osmosis produced water tank.Said nano-filtration unit also is connected cleaning system (cyclical intermission use) respectively with the feed-water end of reverse osmosis units, and the dense water end (W.E.) of nano-filtration unit and reverse osmosis units inserts dense pond separately respectively, recycles respectively treating again.
Said membrane bioreactor (perhaps immerse decline, ultra-filtration equipment) is made up of membrane module, aerating pipelines, water inlet and outlet pipeline, mixed solution circulation line, mixed solution recycle pump, MBR water pump; To the coking chemical waste water biochemical treatment, membrane bioreactor recommends to adopt built-in technology, preferred plate film assembly, membrane pore size＜0.3um.Be more suitable for high concentration sludge, underrun, anti impulsion load is guaranteed membrane bioreactor MBR stable water outlet, and mud silts index SDI value up less than 4.
Said more medium filter (MMF) partial interior contains silica sand and hard coal, and filtration flow-rate is lower than 6 meters/hour.It is the colloidalmaterial that interception penetrates the MBR fenestra that the more medium filter main purpose is set behind membrane bioreactor.More medium filter is through coagulation, and the small-particle colloidalmaterial with these leakages is condensed into " group ", and through low speed, Depth Filtration, effectively interception more stably moves with the protection postchannel process before nanofiltration, reverse osmosis unit.
The pretreatment technology combination of MBR+MMF; Because MBR not only is suitable for operation under coking chemical waste water biochemical system mal-condition; Its effluent quality reaches the subsequent technique requirement again fully; Substitute, cancelled the various medicaments that need heavy addition in the traditional technology (materializations such as flocculation sediment, filtration are handled), reduced system operation cost significantly, so economical rationality.And MMF plays the guaranteeing role of depth type filtration in this technology, guarantees that water outlet reaches pretreated water quality requirement.
Said nano-filtration unit, the pressure putamina container of arranging by HPP, by a certain percentage (many nf membrane elements have been placed in series connection in 1 pressure putamina) is a nanofiltration membrane component, and water inlet, produces water and dense water pipe is formed.HPP pumps into nanofiltration membrane component with the former water high pressure of raw water box in the pretreatment technology, and nf membrane is produced water and got into intermediate water tank via water producing pipe, and dense water gets into the dense pond of nanofiltration via dense water pipe.
To the former water after the coking chemical waste water biochemical treatment, its saltiness (TDS) is very high, sometimes even up to more than the 10000 μ s/cm (with electrical conductivity meter).Only be difficult to stable reach industrial make up water standard (specific conductivity＜500 μ s/cm), also need set up the two-pass reverse osmosis treatment unit with the first-stage reverse osmosis treat effluent.Therefore, adopt the NF nano-filtration unit, not only can remove organic cod and hardness salt (divalent ion) remaining in the coking chemical waste water, can also serve as the partial function (the inorganic salt clearance is with electrical conductivity meter＞40%) of first-stage reverse osmosis as pre-process technology.System process only need be set up second stage reverse osmosis units in the nano-filtration unit postposition both can stablize the industrial make up water standard that reaches.
Remaining organic substance to after the coking chemical waste water biochemical treatment is higher, and (COD＞150mg/l), we advise the nano-filtration unit (NF) that adopting process process control, feed separation nf membrane are formed, and remove organic superior functionality and tolerance to strengthen it.In addition, nf membrane also has suitable clearance to divalent salts, and the soft water (having removed divalent ion) of process nanofiltration passes through reverse osmosis unit (RO) again, has not had the tendency of fouling, does not need to add any Scale inhibitors again, has reduced running cost again.
Said reverse osmosis units, the pressure putamina container of arranging by HPP, by a certain percentage (many reverse-osmosis membrane elements have been placed in series connection in 1 pressure putamina) is a reverse osmosis membrane assembly, and water inlet, produces water and dense water pipe is formed.HPP pumps into reverse osmosis membrane assembly with the water high pressure of intermediate water tank after the nano-filtration unit, and film produces water and gets into reverse osmosis produced water tank via water producing pipe, and dense water gets into reverse osmosis concentrated pond via dense water pipe.
The beneficial effect of coking chemical waste water bio-chemical effluent degree of depth recycling processing system of the present invention is: substitute biochemical second pond through utilizing membrane bioreactor; And and more medium filter (MMF) form pretreatment technology, thereby replace the traditional technology of multiple tracks high energy consumptions such as deposition, coagulation and filtration and ultrafiltration, high running cost; Through utilizing nanofiltration and reverse osmosis membrane to be combined into the two-pass reverse osmosis device, not only can offset the higher unfavorable factor of coking chemical waste water bio-chemical effluent organism, and the desalination degree of depth is further enhanced.Total system is effectively handled to the coking chemical waste water bio-chemical effluent, has the high processing effect and makes effluent quality reach that reuse requirement, practical application property are strong, system is stable, running cost is extremely low; Transition zero lap and neutral gear between the front and back technology that system adopted are comparatively simplified and perfect.
Description of drawings
According to accompanying drawing the present invention is done further explain below.
Fig. 1 is the theory of constitution synoptic diagram of the said coking chemical waste water bio-chemical effluent of embodiment of the invention degree of depth recycling processing system.
Embodiment
As shown in Figure 1; The described coking chemical waste water bio-chemical effluent of embodiment of the invention degree of depth recycling processing system comprises by membrane bioreactor, raw water box, more medium filter, nano-filtration unit, reverse osmosis units, reverse osmosis produced water tank, washing unit, dense pond and forming.The inlet tube and outlet tube of said membrane bioreactor is connected with biochemistry pool and raw water box respectively in order to the follow-on system use; The rising pipe of said raw water box is provided with more medium filter; Said more medium filter rising pipe be linked in sequence successively nano-filtration unit, reverse osmosis units, reverse osmosis produced water tank; Nano-filtration unit wherein also is connected washing unit respectively with the feed-water end of reverse osmosis units, and the dense water end (W.E.) of this nano-filtration unit and reverse osmosis units inserts dense pond respectively.Said membrane bioreactor comprises immersed type plate type membrane component, aerating pipelines, water inlet and outlet pipeline, mixed solution circulation line, mixed solution recycle pump, MBR water pump; Its mode of operation is: the MBR water pump is through the immersed type plate type membrane component; With the constant suction filtration of system's wastewater treatment capacity; Effectively improve efficient, the reinforcement biochemical treatment effect of solid-liquid separation, for obtaining the fine water outlet.Partially mixed liquid is back to the biochemistry pool front end, and homogenizing biochemical system sludge concentration improves biochemical front-end processing ability, and MBR water inlet (being the coking chemical waste water bio-chemical effluent) COD is about 250mg/L, and water outlet SDI＜4, COD reduce to about 160mg/L after treatment; The water of said intermediate water tank is the membrane bioreactor water outlet; It pumps into more medium filter through raw water pump and carries out subsequent processes; So that carry out adding of medicaments such as oxygenant, flocculation agent, the water after the dosing gets into more medium filter at multimedium inlet channel place pipe laying mixing tank; Said more medium filter is to utilize one or more filtration mediums, at the higher water of the following turbidity of certain pressure through certain thickness granular or non-particulate shape material, thereby active adsorption, remove suspensoid impurity; More medium filter in the present embodiment partly adopts silica sand and hard coal; Utilize the associating pre-treatment of membrane bioreactor and more medium filter; The nanofiltration influent quality can effectively be optimized in water outlet SDI＜3, guarantees the long-term stability operation of nanofiltration device and follow-up reverse osmosis unit.
The described coking chemical waste water bio-chemical effluent of above embodiment of the invention degree of depth recycling processing system; Nano-filtration unit wherein is nanofiltration (NF); Adopt the new membrane stripping technique, under lower pressure, still have higher desalting performance, main with removing divalence or polyvalent ion and the molecular weight organism between 200～500; Based on this characteristic; Nanofiltration part can effectively be removed difficult degradation COD and hardness salts substances remaining in the coking biochemical water outlet, reaches the ideal treatment effect, and this device water inlet COD is arranged on about 160mg/L in the present embodiment, specific conductivity is about 7000 μ s/cm; Through handling, the water outlet of NF device be about COD about 40mg/L, specific conductivity is at 3600 μ s/cm.Said reverse osmosis units be a kind of be impellent with the pressure difference; From solution, isolate the membrane sepn operation of solvent; Compare with nanofiltration, univalent ion and molecular weight are lower than 200 organism to be had and holds back effect preferably, thereby in system, can further remove salt remaining in the nanofiltration water outlet; Reduce and produce water conductivity; Make it reach industrial make up water standard, this device water inlet COD of present embodiment is arranged on about 40mg/L, specific conductivity about 3600 μ s/cm, through treatment unit water outlet COD about 5mg/L, specific conductivity is below 180 μ s/cm; Said more medium filter need regularly carry out backwash to guarantee pretreating effect, and the water source can adopt membrane bioreactor water outlet, the dense water of nanofiltration or reverse osmosis concentrated water etc.Regularly strainer is carried out backwash owing to directly adopt the membrane bioreactor water outlet as the backwash water source; Nanofiltration and reverse osmosis unit are after operation for some time; Flux can descend; Need clean recovery timely with its processing power, this moment, scavenging pump capable of using cleaned the front end that the medicament that configures in the washing unit pumps into nanofiltration device or reverse osmosis unit.Need rinse-system after clean accomplishing, for nanofiltration device or reverse osmosis unit come into operation ready again.
In sum, coking chemical waste water bio-chemical effluent degree of depth recycling processing system according to the invention is provided with more medium filter after membrane bioreactor, and main purpose is the colloidalmaterial that interception penetrates MBR micro-filtration fenestra; More medium filter is through coagulation, and the small-particle colloidalmaterial with these leakages is condensed into " group ", and through low speed, Depth Filtration, effectively interception is before nanofiltration, reverse osmosis unit, with the steady running more of protection postchannel process.Because the MBR membrane bioreactor not only is suitable for operation under coking chemical waste water biochemical system mal-condition; Its effluent quality reaches the subsequent technique requirement again fully; Substitute, cancelled the various medicaments that need heavy addition in the traditional technology (materializations such as flocculation sediment, filtration are handled), reduced system operation cost significantly, so economical rationality; And more medium filter plays the guaranteeing role of depth type filtration in this technology, further guarantees to reach pretreated water quality requirement.(COD＞150mg/l), the nanofiltration technique (NF) that can adopt process control, feed separation film to form is removed organic superior functionality and tolerance to strengthen it to the remaining organic substance after the coking chemical waste water biochemical treatment; In addition, nf membrane has suitable clearance to divalent salts, and the soft water (having removed divalent ion) of process nanofiltration passes through reverse osmosis unit (RO) again, has not had fouling tendency, need not add any Scale inhibitors again.To the former water after the coking chemical waste water biochemical treatment; Its saltiness (TDS) is very high, sometimes even up to more than the 10000 μ s/cm (with electrical conductivity meter), only uses the first-stage reverse osmosis treat effluent; Can not stablize the industrial make up water standard (specific conductivity＜500 μ s/cm) that reaches; Also need set up the two-pass reverse osmosis treatment unit, therefore adopt the NF nanofiltration, not only can remove COD organism and hardness salt remaining in the coking chemical waste water as preceding road treatment process; Also can serve as the partial function (inorganic salt are with electrical conductivity meter clearance＞40%) of one-level RO, system only need set up one-level RO after nanofiltration both can stablize the industrial make up water standard that reaches.
Claims (6)
1. coking chemical waste water bio-chemical effluent degree of depth recycling processing system comprises membrane bioreactor (perhaps submergence decline, ultra-filtration equipment), raw water box, more medium filter, nano-filtration unit, intermediate water tank, reverse osmosis units, reverse osmosis produced water tank and washing unit.It is characterized in that: the inlet tube and outlet tube of said membrane bioreactor is connected with biochemistry pool and raw water box respectively; The rising pipe of said raw water box is provided with more medium filter; Said more medium filter rising pipe be linked in sequence successively nano-filtration unit, intermediate water tank and reverse osmosis units finally get into reverse osmosis produced water tank.
2. coking chemical waste water bio-chemical effluent degree of depth recycling processing system according to claim 1; It is characterized in that: utilize membrane bioreactor or other immersed microfiltration device to substitute biochemical second pond; And form pretreatment technology with more medium filter; Thereby replace the traditional technology of multiple tracks high energy consumptions such as deposition, coagulation and filtration and ultrafiltration, high running cost, guarantee follow-up nanofiltration and reverse osmosis unit influent quality.
3. coking chemical waste water bio-chemical effluent degree of depth recycling processing system according to claim 1 is characterized in that: higher to coking chemical waste water bio-chemical effluent organic substance, the nano-filtration unit that adopts the feed separation nf membrane to form is strengthened and is removed this type organic; High to coking chemical waste water bio-chemical effluent specific conductivity, utilize nf membrane to remove divalent ion etc., reduce follow-up reverse osmosis unit fouling tendency.
4. coking chemical waste water bio-chemical effluent degree of depth recycling processing system according to claim 1; It is characterized in that: still higher to coking chemical waste water bio-chemical effluent specific conductivity after nanofiltration is handled; Adopt r-o-that it is carried out subsequent processes, reach the purpose of further desalination.
5. coking chemical waste water bio-chemical effluent degree of depth recycling processing system according to claim 1; It is characterized in that: unite use nanofiltration and reverse osmosis technology to the coking wastewater biochemical water outlet carry out advanced treatment; Make water outlet satisfy industrial make up water standard, expand its reuse space.
6. coking chemical waste water bio-chemical effluent degree of depth recycling processing system according to claim 1; It is characterized in that: adopt " membrane bioreactor+more medium filter+nanofiltration+r-o-" technology to the coking wastewater biochemical water outlet carry out degree of depth Treatment for Reuse, system is stable, running cost is low.
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| CN102531278A (en) * | 2012-03-01 | 2012-07-04 | 董文艺 | Process and system for deeply treating drinking water through two-section membrane method |
| CN103253836A (en) * | 2013-06-07 | 2013-08-21 | 光大环保科技发展（北京）有限公司 | Deep purification and treatment device and method of landfill leachate |
| CN104926035A (en) * | 2015-06-11 | 2015-09-23 | 武汉钢铁(集团)公司 | Process and device for advanced treatment and reuse of comprehensive coking wastewater |
| CN106830503A (en) * | 2017-01-13 | 2017-06-13 | 安徽联科水基材料科技有限公司 | A kind of industrial dye waste water reuse technology |
| CN108101317A (en) * | 2018-01-22 | 2018-06-01 | 四会市宏创工业机械设备有限公司 | Electrophoresis waste water COD processing unit |
| CN108996809A (en) * | 2018-07-02 | 2018-12-14 | 大唐（北京）水务工程技术有限公司 | A kind of coal chemical industry wastewater treating method and device |
| CN109553185A (en) * | 2018-12-29 | 2019-04-02 | 肇庆市鹏凯环保装备有限公司 | A kind of film advanced treating integrated module device for landfill leachate |
| CN110862167A (en) * | 2019-08-29 | 2020-03-06 | 深圳中拓天达环境工程有限公司 | Electrode foil corrosion wastewater treatment system and treatment process thereof |
| CN111204843A (en) * | 2020-01-09 | 2020-05-29 | 深圳市水视界环保科技有限公司 | Energy-saving water filtering system combining reverse osmosis membrane and nanofiltration membrane |
| CN113582371A (en) * | 2021-06-09 | 2021-11-02 | 北京清新环境技术股份有限公司 | Membrane concentration treatment method for high-salinity wastewater |
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| CN110862167A (en) * | 2019-08-29 | 2020-03-06 | 深圳中拓天达环境工程有限公司 | Electrode foil corrosion wastewater treatment system and treatment process thereof |
| CN111204843A (en) * | 2020-01-09 | 2020-05-29 | 深圳市水视界环保科技有限公司 | Energy-saving water filtering system combining reverse osmosis membrane and nanofiltration membrane |
| CN113582371A (en) * | 2021-06-09 | 2021-11-02 | 北京清新环境技术股份有限公司 | Membrane concentration treatment method for high-salinity wastewater |
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Application publication date: 20120118 |