CN100465112C - Technological process of treating papermaking effluent for reuse based on membrane integrating technique - Google Patents
Technological process of treating papermaking effluent for reuse based on membrane integrating technique Download PDFInfo
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The technological process of treating papermaking effluent for reuse based on membrane integrating technique has membrane bioreactor, continuous membrane filter and reverse osmosis unit integrated for high efficiency treatment of papermaking effluent. The papermaking effluent treating process includes drum filtering and flocculating deposition to eliminate most suspended matter and colloid matter, anaerobic and aerobic biochemical treatment, filtering in membrane separating element, continuous membrane filtering, and treating with reverse osmosis membrane to reach the papermaking water standard. The present invention is especially suitable for treating hard-to-treat papermaking effluent.
Description
[technical field]
The invention belongs to the technical field of waste water processing of environment protection, particularly a kind of paper waste is handled the environmental pollution improvement's new technology with reuse.
[background technology]
Along with the development of paper industry, the waste water that discharges in its production process has become one of current topmost pollution source of water body.At present, there are family surplus the sum 10000 of large, medium and small paper mill, the BOD in the paper waste in China
5More than 200 ten thousand tons of annual emissions account for BOD in the total discharging of national waste water
525%, year waste discharge amount accounts for 1/10th of national waste water total release up to billion cubic meter more than 40, occupies second in trade effluent.Though China's gross amount of water resources occupies the 6th in the world, only has 7% of world's fresh water amount, is the country of shortage of water resources, be one of 12 poor-water countries in the world.Therefore, exploitation technological process for the treatment of papermaking and reuse technology have important practical significance to promoting ecological environmental protection and paper industry Sustainable development very urgent.
Paper waste is a high concentrated organic wastewater, contains pollutents such as lignin, residual alkali, sulfide, muriate, is characterized in that wastewater flow rate is big, COD content height, and the fibre suspension in the waste water is many, and contains divalent sulfur, the band look, and the thio-alcohol foul odour is arranged.Paper waste mainly contains three sources: pulping waste liquor (black liquor), middle section water, paper machine white water.The main method of paper waste processing at present mainly contains physics method, chemical oxidization method and bioremediation.
Physical method mainly comprises methods such as absorption method, air supporting method, flocculence.The adsorption phenomena that absorption method mainly utilizes some material with very large specific surface area to produce is adsorbed deliquescent organism, but can not remove insoluble substances such as colloid and SS.The purify waste water principle of treatment technology of air supporting method is a large amount of micro-bubbles that induce one to greatest extent in waste water, add flocculation agent or flotation agent simultaneously, make in the water fine suspension such as impurity, particulate and bubble adhered to one another, form the buoyancy aid of global density less than water, rely on buoyancy to float then and be removed to the water surface, realize solid-liquid separation, thereby reach the purpose of purifying liquid waste.Polymeric flocculant has good flocculation, decoloring ability and uses easy to operate.In general, flocculence can only be removed the large particulate matter in the waste water, also needs darker processing as further purifying liquid waste.
Chemical oxidization method mainly is to utilize chemical reaction, transforms, separates, recycles pollutants in waste water matter, comprises hydrothermal oxidization method, photochemical catalytic oxidation, wet oxidation process, supercritical water oxidation method etc.The hydrothermal oxidization technology is a kind of effective new chemical oxidation technology, it is under the operational condition of High Temperature High Pressure, at hot aqueous phase air or oxygen and other oxygenant, with the organism of solubilised state in the paper waste and suspended state or go back the ortho states inorganics in hot aqueous phase oxygenolysis, the obvious characteristic of hydrothermal oxidization technology is reflected at hot aqueous phase exactly carries out, so energy consumption is higher.Though photocatalytic oxidation demonstrates good prospects for application, really be used for industrial requiring further study.Adopt wet oxidation process to handle black liquid, control certain reaction temperature, pressure make oxidation operation degraded in the black liquor, processed waste water CODc
rClearance can reach more than 90%.Water becomes the good solvent of nonpolar organic matter and oxygen under postcritical state, organic like this oxidizing reaction just can be carried out in the homogeneous phase of oxygen enrichment, be not subjected to the restriction of alternate transfer and make organism contained in the paper waste be resolved into simple harmless micromolecular compound such as water, carbonic acid gas by oxygen, thereby reach the purpose of purification, but this technology is had relatively high expectations to equipment and operational condition.
Biochemical treatment process is to utilize microbiological deterioration metabolism organism to handle waste water for inorganics.Environment by artificial creation is suitable for microorganism existence and breeds makes it a large amount of breedings, to improve the organic efficient of its oxygenolysis.Kind according to using microorganism can be divided into aerobic method, anaerobic process and biological enzyme.Aerobic method is to make good use of the method that waste water is handled in oxygen animalcule catabolism under aerobic conditions, and aerobic treatment method commonly used has methods such as activated sludge process, biomembrance process, biological contact oxidation process, biological fluidized bed.Anaerobic process is under the condition of anaerobic, handles the method for waste water by anaerobion catabolism, and anerobe releases energy from molecule by anaerobic respiration.That develops at present has anaerobic pond method, anaerobic filter bed method, anaerobism fluidized bed method, anaerobic expanded bed method, anaerobism rotating disk method, upflow anaerobic sludge blanket process (UASB) method etc.Wherein use more UASB method, make waste water through sealing container bottom, the sludge blanket of forming by anaerobion is decomposed into methane and carbonic acid gas with the organism in the waste water.It is to form radical by enzyme reaction earlier that enzyme is handled organic mechanism, and radical generation chemical polymerization generates the macromolecular compound precipitation then.Compare with other microbiological treatment, enzyme is handled to have the catalysis efficiency height, the reaction conditions gentleness, wastewater quality and equipment situation is required lower, and speed of response is fast, to temperature, concentration and toxic substance wide accommodation, advantage such as can reuse.
The problem that exists: aspect materialization, though gac has the characteristics of advantages of good adsorption effect, regeneration of activated carbon difficulty, cost height, and also bad the deliquescent organism in water to other material removal effect, the sorbent material that many enterprises turn to other low prices, material to be easy to get respectively.It is not high that air supporting method and flocculation rule are removed efficient to dissolved organic matter.Though chemical method is to the organism treatment effect is fine but cost is higher, and the novel oxidation technology that has also is in the experimental study stage and the industrialization of being unrealized.Aspect biochemical, though processing cost is cheap relatively, floor space is very big and effluent quality is unstable, can only reach emission standard and can not satisfy reuse standard.
In sum, traditional method of wastewater treatment that generally adopt in present domestic most of paper mills can only be accomplished qualified discharge, and along with the raising that national environmental standard and wastewater recycle rate require, papermaking enterprise is in the face of increasing water and environmental protection pressure.Membrane separation and integration technology Processing Paper Wastewater and reuse technology are the effective means that addresses this problem.
Membrane separation technique has been applied to paper industry abroad as a kind of water prevention and cure of pollution method of new high-efficiency the seventies in 20th century.China also is introduced in the pulp and paper industry in recent years, is applied in the advanced treatment of pulping waste liquor, bleaching effluent, mthod of white water from paper making and middle-stage wastewater.
Membrane separation technique is a kind of separation of material in liquid or the gaseous media, isolation technique that concentrates and purify of being widely used in.Be used for the extremely trickle micropore that gathers on the membranous wall of liquid separation, during the side by film, solvent and low molecule solute see through membranous wall to be become through liquid stoste, and holds back than macromole solute tunicle, thereby reaches the purpose of separating substances or purifying under pressure.Membrane technique is a kind of advanced person's a isolation technique, and many advantages are arranged.For example, separation accuracy height, selectivity are strong, at normal temperatures the no phase-state change of operation, energy consumption is low, level of automation is high.The liquid separation membrane technique comprises membrane process such as micro-filtration, ultrafiltration, reverse osmosis, membrane bioreactor.
At present mainly ultra-filtration technique is used for the extraction recovery of papermaking wastewater useful matter, the aspects such as processing reuse of process waste water abroad.The test report of existing Membrane Bioreactor for Wastewater Treatment bleaching effluent, the test report of the integrated Processing Paper Wastewater of desalting technology such as ultra-filtration technique and electrodialysis is also arranged, but do not have membrane bioreactor and Continuous Membrane Filtration technology and reverse osmosis desalination technology integrated technique to handle the report of papermaking terminal comprehensive wastewater.
[summary of the invention]
The objective of the invention is to solve the prior art above shortcomings, a kind of processing method based on membrane integrating technique Processing Paper Wastewater and reuse is provided,, and make it to be back to use in the production process with the efficient processing of realization paper waste.
The crucial membrane technique that the present invention is used for waste water advanced processing and reuse comprises the biochemical process that is used for wastewater treatment and the membrane bioreactor (MBR) of membrane technique be combined into, the Continuous Membrane Filtration technology (CMF) and the reverse osmosis purification technique (RO) of reuse water advanced treatment.
MBR is a kind of novel sewage biochemical treatment system, and it is to be that catalyzer carries out chemical reaction or bio-transformation with enzyme, microorganism or animal and plant cells, constantly isolates reaction product by membrane separation technique simultaneously and holds back catalyzer and the device that reacts.It replaces second pond in the ordinary activated sludge technology with film separation unit, thereby has overcome because the settling tank solid-liquid separation efficiency is not high, the mud in the aeration tank is difficult to maintain higher concentration, causes the low shortcoming of treatment unit volumetric loading.Especially for bio-refractory organic waste water, owing to accumulated the slow microorganisms of rate of propagation such as a large amount of hardly degraded organic substance decomposers and nitrifier in the membrane bioreactor, they and organic duration of contact be greater than hydraulic detention time (HRT), thereby improved the clearance of hardly degraded organic substance greatly.It is good to have effluent quality, anti impulsion load, and floor space is little, can realize characteristics such as whole-course automation control.
CMF is the pre-treatment of the turbidity removal defecate and purify that aims at tap water, underground water, surface water, advanced treatment of wastewater reuse, large-scale RO system and separating technology that some are special and design.Continuous membrane filter can effectively be removed impurity in the water, reduces turbidity, suspended substance and colloidalmaterial, reduces pollution index (SDI), can guarantee the safe operation of RO system to greatest extent.
The RO technology can be removed the organic pollutant in the water effectively, removes most of hardness and other soluble solids of part in the water simultaneously, makes every index of sewage reach the reuse requirement.The RO film can reach more than 90% to organic decreasing ratio; Can reach more than 95% to bivalent ions decreasing ratio; Decreasing ratio to monovalent ion can reach more than 90%.
Processing method based on membrane integrating technique Processing Paper Wastewater and reuse provided by the invention, realize through following steps:
Waste water after the first step, process preliminary sedimentation tank are handled at first enters membrane bioreactor and handles, and membrane bioreactor comprises successively:
(1), anoxic pond is handled: hydraulic detention time is 0.5-10 hour, dissolved oxygen (DO) concentration 0.1-1.0mg/L;
(2), Aerobic Pond handles: hydraulic detention time is 5-30 hour, activated sludge concentration 5-15g/L, dissolved oxygen concentration 1-8mg/L, gas-water ratio is 10～20:1;
(3), the film filter filtration treatment: keep the certain aeration intensity in film district, dissolved oxygen concentration maintains 2-8mg/L, thickened sludge reflux ratio 1-8, the mixed solution that anoxic/aerobic biochemical is handled separates through membrane filtration, produces penetrating fluid, mud then is back to anoxic pond;
Second step, continuous membrane filter cell processing: the penetrating fluid that membrane bioreactor produces is through the continuous membrane filter cell processing, further removed the macromolecule contaminant in the membrane bioreactor product water, make the unitary water inlet of subsequent disposal SDI index be lower than 3 level all the time, reach feed water by reverse osmosis requirement index;
The 3rd step, reverse osmosis units are handled: reverse osmosis units uses reverse osmosis membrane further to remove impurity such as organism in the water, inorganic salt, the every after testing index of penetrating fluid after the processing all is better than the paper water, but direct reuse is in paper technology, the reverse osmosis concentrated liquid allow compliance with emission standards can qualified discharge.
The preferred 0.1-0.5mg/L of dissolved oxygen concentration during the first step anoxic pond is handled; The preferred 3-6 of thickened sludge reflux ratio in the film district.
Film filter is immerseable or external placed type in the first step; A cycle of operation of membrane bioreactor is 4-30 minute, and backwash 5-30 second, backwash water is that membrane bioreactor produces water.
The membrane module that constitutes film filter in the first step is column or curtain type film assembly, used form membrane is the external-compression type hollow-fibre membrane, and membrane material is a kind of in hydrophilic polyethersulfone (PES), polyvinylidene difluoride (PVDF) (PVDF), polyvinyl chloride (PVC), the polyethylene (PE).Preferentially select the special-purpose mould material of membrane bioreactor of wetting ability and membrane pore size narrowly distributing for use, the aperture of film is 0.01～0.45 micron.
The cleaning of film is divided into online dosing reinforcement backwash and off-line matting in the film filter; It is 1-4 time/week that the backwash cycle is strengthened in online dosing; Off-line matting clean-out system is acid, alkali, oxygenant or sterilant, and the cleaning interval is 180-360 days.
In second step, the continuous membrane filter unit equipment mainly is made up of membrane filter unit, cleaning unit and ECU; Membrane filter unit mainly is the module that the technical scale membrane module assembles; Cleaning unit comprises that mainly dosing, air purge, washing and backwash system form; Automatically controlled and data gathering is finished by PLC and industrial computer.
Used film is commercially available hollow-fibre membrane, and membrane material is wetting ability PES, PVDF, and PVC, preferred: wetting ability PES, the aperture of film is the 0.005-0.2 micron.
The membrane module diameter is 4 cun, 6 cun, 8 cun, 10 cun a technical scale membrane module in the continuous membrane filter unit, and filter type is an inner pressed, or external-compression type; Filtered model is that cross-flow or full dose are filtered; The film auto-programming cleans, and mode has water flushing, gas/water flushing, matting and backwash.
In the 3rd step, reverse osmosis units equipment adopts the pollution resistant composite film reverse osmosis membrane assembly, and membrane module form is the coiled reverse osmosis membrane assembly; Its operation scheme is multistage multi-stage type, intakes to the continuous membrane filter unit produces water, and the rate of recovery is more than 60%; Water inlet adds Scale inhibitors and reductive agent.
Advantage of the present invention and beneficial effect:
Processing method of the present invention is integrated membrane bioreactor (MBR), continuous membrane filter (CMF) and three kinds of unit membrane processes of reverse osmosis (RO), realized the efficient advanced treatment of paper waste, the paper technology water is satisfied in water outlet, but direct reuse has been realized the cycling and reutilization of paper waste in paper.Three unit are controlled automatically by PLC, the degree of integration height, and operation is handled with the water quality data online acquisition.
The present invention has reduced the ton paper blowdown flow rate and the comprehensive water loss of ton paper of paper, improved the reclamation rate of water, this is to reducing the paper industry gross contamination emission, improving water utilization rate, promote the healthy Sustainable development of paper industry, have positive effect to the friendly of environment with to the contribution of Green GDP.
The inventive method can be used for, and slurrying factory effluent, paper waste water, waste paper reclaim other waste water and sanitary sewage and the later wastewater treatment of unusual rainwater mixing in deinking wastewater, the production.
[description of drawings]
Fig. 1 is that the paper waste that the present invention is based on membrane integrating technique is handled and recovering process flow skeleton symbol figure.
[embodiment]
The invention will be further described below in conjunction with technical process Fig. 1.
Described paper waste is slurrying factory effluent, paper waste water, waste paper recovery deinking wastewater and other waste water of producing and sanitary sewage and the later waste water of unusual rainwater mixing, mainly contains organic matters such as fiber fines, waste paper impurity and a small amount of pectin, wax, carbohydrate in the waste water.
Waste water at first filters solid-liquid separation through rotary drum, and composite waste is being mixed well the pond after Load Regulation, adds a certain amount of coagulating agent, and flocculation sediment is removed most suspended substances body and colloidal type material, and COD is controlled at 1200～3000mg/L.The preliminary sedimentation tank water outlet is as the water inlet of membrane bioreactor.
The membrane separation technique integrated system that is used for paper waste processing and reuse mainly comprises three major portions: MBR unit, CMF unit and RO unit.Three unit are controlled automatically by PLC, the degree of integration height, and operation is handled with the water quality data online acquisition.
In the MBR unit, preliminary sedimentation tank waste water at first enters an anoxic pond, again through two Aerobic Ponds to membrane cisterna, the membrane filtration water outlet enters the CMF unit.The membrane cisterna mixed solution is back to anoxic pond through reflux pump.Membrane cisterna liquidometer control water inlet and water outlet, water inlet is driven into anoxic pond by lift pump, and the film water outlet is finished by a suction pump.Four ponds all are communicated with by valve, and aeration is provided by a gas blower, and flow is controlled by glass rotameter.Cycle of operation of MBR is 5-20 minute, backwash 10-30 second.Backwash water is that MBR produces water.
The MBR system preferentially selects the special-purpose mould material of the MBR of wetting ability and membrane pore size narrowly distributing for use, improves the MBR effluent characteristics, improves the antifouling property of MBR film significantly, improves the cycle of operation of film.Membrane module is column or curtain type film assembly, because the columnar membrane assembly has reduced the membrane module aeration rate, has reduced the gas-water ratio (gas-water ratio is 10-15:1) of membrane module, has reached the energy-conservation effect that reduces cost, preferred columnar membrane assembly.
The unitary biochemical process condition of MBR is as follows: anoxic section hydraulic detention time is 0.5-10 hour, the preferred 0.1-0.5mg/L of dissolved oxygen (DO) concentration.The aerobic section hydraulic detention time is 5-30 hour, and gas-water ratio is 10-20:1, and aerobic zone DO maintains 2-8mg/L; Activated sludge concentration (MLSS) 5-15g/L.Keep the certain aeration intensity in film district, DO maintains 2-8mg/L.The thickened sludge preferred 3-6 that refluxes.
MBR film operation process such as following table 1:
Table 1 MBR film operation process
CMF equipment mainly is made up of membrane filter unit, cleaning unit and ECU, and membrane filter unit mainly is the module that plant-scale membrane module assembles; Cleaning unit comprises that mainly dosing, air purge, washing and backwash system form; Automatically controlled and data gathering is finished by PLC and industrial computer.In the CMF unit, water inlet is squeezed into through security personnel's strainer by pump, can establish cross-flow, two kinds of filtered models of full dose filtration.The film auto-programming cleans, and mode has water flushing, gas/water flushing, matting and backwash.
Used film can be commercially available hollow-fibre membrane in the CMF technology, and the aperture of preferred film is 0.01 micron wetting ability PES.Membrane module can be that diameter is technical scale membrane modules such as 4 cun, 6 cun, 8 cun, 10 cun, and filter type can be an inner pressed, also can be external-compression type.
Reverse osmosis membrane is the polyamide-based reverse osmosis composite membrane of antipollution low pressure, and membrane module form is the coiled reverse osmosis membrane assembly.In the RO unit, operation scheme is multistage multi-stage type, intakes to CMF produces water, and the rate of recovery is more than 60%.Water inlet adds Scale inhibitors and reductive agent.
Embodiment 1
Certain paper mill, south is a raw material with merchantable timber and reclaimed waste paper, waste water quality: COD
CrBe 1500～3500mg/l, SS is 1400～3000mg/l, pH6～9.After mixing well pond, coagulation, cooling and primary deposition, this water enters integrated film system, system throughput 2m
3/ h.
Used MBR membrane module is 6 cun immersion column polyethersulfone hollow fiber film assemblies, 0.1 micron of the filtering accuracy of film.The CMF membrane module is that diameter is 6 cun technical scale inner pressed polyethersulfone hollow fiber film assemblies, and 0.01 micron of the filtering accuracy of film, filtered model are that full dose is filtered.The RO membrane module is commercial goods 8 cun anti-pollution coiled reverse osmosis membranes assembly.
The operational conditions of MBR: a cycle of operation is 8 minutes, stops to produce water 2 minutes, backwash 20 seconds, and backwash water is that membrane bioreactor produces water.MBR biochemical process condition: activated sludge concentration (MLSS) 11500mg/l, 30 days ages of mud.Anoxic section hydraulic detention time is 4.5 hours, dissolved oxygen (DO) concentration 0.1mg/L; The aerobic section hydraulic detention time is 18 hours, and gas-water ratio is 20:1, and aerobic zone DO maintains 4.0mg/L; Keep the certain aeration intensity in film district, gas-water ratio is 10:1, and DO maintains 4.5mg/L; Thickened sludge reflux ratio 4.0.
This system handles the results are shown in Table 2.
The effect of table 2 membrane integrating technique Processing Paper Wastewater
| COD/(mg/L) | SS/(mg/L) | Turbidity/NTU | Colourity/PCU | SDI | Specific conductivity/(μ s/cm) | |
| System's water inlet | 928 | 180 | 1770 | |||
| MBR produces water | 44 | 0.5 | 0.15 | 50 | 2.54 | 1670 |
| CMF produces water | 40 | 0.15 | 0.08 | 48 | 2.3 | 1670 |
| RO produces water | 10 | Do not detect | 0.05 | 9 | 50 | |
| The RO condensed water | 92 | 0.2 | 0.1 |
Embodiment 2
The water quality of waste water is identical with example 1 with treatment capacity.
Used MBR membrane module is 6 cun immersion column polyvinylidene difluoride (PVDF) hollow fiber film assemblies, 0.05 micron of the filtering accuracy of film.CMF membrane module and RO membrane module are with example 1.
The operational conditions of MBR: a cycle of operation is 10 minutes, stops to produce water 2 minutes, backwash 30 seconds, and backwash water is that membrane bioreactor produces water.MBR biochemical process condition: activated sludge concentration (MLSS) 8500mg/l, 60 days ages of mud.Anoxic section hydraulic detention time is 1.5 hours, dissolved oxygen (DO) concentration 0.15mg/L; The aerobic section hydraulic detention time is 20 hours, and gas-water ratio is 15:1, and aerobic zone DO is maintained to 3.5mg/L; Keep the certain aeration intensity in film district, gas-water ratio is 10:1, and DO maintains 4.0mg/L; Thickened sludge reflux ratio 4.5.
The result of this system's different units sees Table 3.
The effect of table 3 membrane integrating technique Processing Paper Wastewater
| COD/(mg/L) | SS/(mg/L) | Turbidity/NTU | Colourity/PCU | SDI | Specific conductivity/(μ s/cm) | |
| System's water inlet | 828 | 155 | 2260 | |||
| MBR produces water | 51.5 | 1.0 | 0.10 | 43 | 2.85 | 2180 |
| CMF produces water | 46 | 0.25 | 0.08 | 41 | 2.2 | 2180 |
| RO produces water | 15 | Do not detect | 0.05 | 9 | 76 | |
| The RO condensed water | 108 | 0.3 | 0.1 |
Embodiment 3
The water quality of waste water and wastewater treatment capacity are identical with example 1.
Used MBR membrane module is 6 cun immersion column PVC hollow fiber membrane assemblies, 0.15 micron of the filtering accuracy of film.CMF membrane module and RO membrane module are with example 1.
The operational conditions of MBR: a cycle of operation is 15 minutes, stops to produce water 2 minutes, backwash 30 seconds, and backwash water is that membrane bioreactor produces water.MBR biochemical process condition:: activated sludge concentration (MLSS) 4800mg/l, 30 days ages of mud.Anoxic section hydraulic detention time is 2.5 hours, dissolved oxygen (DO) concentration 0.3mg/L; The aerobic section hydraulic detention time is 18 hours, and gas-water ratio is 15:1, and aerobic zone DO is maintained to 3.0mg/L; Keep the certain aeration intensity in film district, gas-water ratio is 10:1, and DO maintains 4.0mg/L; Thickened sludge reflux ratio 5.0.
The result of this system's different units sees Table 4.
The result of table 4 membrane integrating technique Processing Paper Wastewater
| COD/(mg/L) | SS/(mg/L) | Turbidity/NTU | Colourity/PCU | SDI | Specific conductivity/(μ s/cm) | |
| System's water inlet | 640 | 153 | 2220 | |||
| MBR produces water | 71 | 1.3 | 0.17 | 33 | 2.64 | 2040 |
| CMF produces water | 67 | 0.5 | 0.07 | 31 | 1.9 | 2040 |
| RO produces water | 18 | Do not detect | 0.02 | 8.5 | 56 | |
| The RO condensed water | 146 | 0.6 | 0.09 |
Embodiment 4
The water quality of waste water, equipment operational conditions and wastewater treatment capacity are identical with example 1.
MBR biochemical process condition: activated sludge concentration (MLSS) 6500mg/l, 30 days ages of mud.Anoxic section hydraulic detention time is 0.5 hour, dissolved oxygen (DO) concentration 0.1mg/L; The aerobic section hydraulic detention time is 25 hours, and gas-water ratio is 20:1, and aerobic zone DO is maintained to 4.0mg/L; Keep the certain aeration intensity in film district, gas-water ratio is 10:1, and DO maintains 4.5mg/L; Thickened sludge reflux ratio 4.0.
The result of this system's different units sees Table 5.
The effect of table 5 membrane integrating technique Processing Paper Wastewater
| COD/(mg/L) | SS/(mg/L) | Turbidity/NTU | SDI | Colourity/PCU | Specific conductivity/(μ s/cm) | |
| System's water inlet | 687 | 148 | 1991 | |||
| MBR produces water | 58 | 0.8 | 0.12 | 3.0 | 48 | 1884 |
| CMF produces water | 53 | 0.4 | 0.08 | 2.1 | 45 | 1884 |
| RO produces water | 20 | Do not detect | 0.06 | 8.5 | 66 | |
| The RO condensed water | 127 | 0.6 | 0.09 |
Claims (10)
1, a kind of processing method based on membrane integrating technique Processing Paper Wastewater and reuse is characterized in that this processing method realizes through following steps:
Waste water after the first step, process preliminary sedimentation tank are handled at first enters membrane bioreactor and handles, and membrane bioreactor comprises successively:
(1), anoxic pond is handled: hydraulic detention time is 0.5-10 hour, dissolved oxygen concentration 0.1-1.0mg/L;
(2), Aerobic Pond handles: hydraulic detention time is 5-30 hour, activated sludge concentration 5-15g/L, dissolved oxygen concentration 1-8mg/L, gas-water ratio is 10～20:1;
(3), the film filter filtration treatment: keep the certain aeration intensity in film district, dissolved oxygen concentration maintains 2-8mg/L, thickened sludge reflux ratio 1-8, the mixed solution that anoxic/aerobic biochemical is handled separates through membrane filtration, produces penetrating fluid, mud then is back to anoxic pond;
Second step, continuous membrane filter cell processing: the penetrating fluid that membrane bioreactor produces is through the continuous membrane filter cell processing, further removed the macromolecule contaminant in the membrane bioreactor product water, make the unitary water inlet of subsequent disposal SDI index be lower than 3 level all the time, reach feed water by reverse osmosis requirement index;
The 3rd step, reverse osmosis units are handled: reverse osmosis units use reverse osmosis membrane is further removed organism and the inorganic salt impurity in the water, the every after testing index of penetrating fluid after the processing all is better than the paper water, but direct reuse is in paper technology, the reverse osmosis concentrated liquid allow compliance with emission standards can qualified discharge.
2, processing method according to claim 1 is characterized in that dissolved oxygen concentration is 0.1-0.5mg/L in the processing of the first step anoxic pond; The thickened sludge reflux ratio is 3-6 in the film district.
3, processing method according to claim 1 is characterized in that film filter is immerseable or external placed type in the first step; A cycle of operation of membrane bioreactor is 4-30 minute, and backwash 5-30 second, backwash water is that membrane bioreactor produces water.
4, processing method according to claim 1, it is characterized in that in the first step, the membrane module that constitutes film filter is column or curtain type film assembly, and used form membrane is the external-compression type hollow-fibre membrane, and membrane material is a kind of in hydrophilic polyethersulfone, polyvinylidene difluoride (PVDF), polyvinyl chloride and the polyethylene.
5, processing method according to claim 4 is characterized in that in the membrane bioreactor system, and employing wetting ability and membrane pore size are the special-purpose mould material of 0.01～0.45 micron membrane bioreactor.
6, processing method according to claim 1 is characterized in that the continuous membrane filter unit equipment mainly is made up of membrane filter unit, cleaning unit and ECU in second step; Membrane filter unit mainly is the module that the technical scale membrane module assembles; Cleaning unit mainly comprises dosing, air purge, washing and backwash system; Automatically controlled and data gathering is finished by PLC and industrial computer.
7, processing method according to claim 6 is characterized in that used film is commercially available hollow-fibre membrane in the continuous membrane filter unit, and membrane material is hydrophilic polyethersulfone, polyvinylidene difluoride (PVDF) or polyvinyl chloride, and the aperture of film is the 0.005-0.2 micron.
8, processing method according to claim 7 is characterized in that membrane material is a hydrophilic polyethersulfone.
9, according to claim 6 or 7 or 8 described processing methodes, it is characterized in that membrane module diameter in the continuous membrane filter unit is the technical scale membrane module of 4 cun, 6 cun, 8 cun or 10 cun, filter type is inner pressed or external-compression type; Filtered model is that cross-flow or full dose are filtered.
10, processing method according to claim 1 is characterized in that reverse osmosis units equipment adopts the pollution resistant composite film reverse osmosis membrane assembly in the 3rd step, and membrane module form is the coiled reverse osmosis membrane assembly; Its operation scheme is multistage multi-stage type, intakes to the continuous membrane filter unit produces water, and the rate of recovery is more than 60%; Water inlet adds Scale inhibitors and reductive agent.
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| AU2008261116B2 (en) * | 2008-09-30 | 2013-02-07 | Central Gippsland Region Water Corporation | Process and plant for treating a water stream |
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