CN101348313A - Papermaking waste water processing technological process based on membrane biological reactor - Google Patents

Papermaking waste water processing technological process based on membrane biological reactor Download PDF

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CN101348313A
CN101348313A CNA2008101432365A CN200810143236A CN101348313A CN 101348313 A CN101348313 A CN 101348313A CN A2008101432365 A CNA2008101432365 A CN A2008101432365A CN 200810143236 A CN200810143236 A CN 200810143236A CN 101348313 A CN101348313 A CN 101348313A
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nanofiltration membrane
treatment
waste water
aerobic treatment
membrane
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CN101348313B (en
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陈介南
何钢
熊晓妹
周再魁
詹鹏
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Central South University of Forestry and Technology
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Central South University of Forestry and Technology
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    • 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 technological method for treating paper-making wastewater based on a membrane biological reaction device. The technological method comprises the following steps that after treated by a primary sedimentation tank, the wastewater undergoes aerobic treatment at first; during aerobic treatment, degradation of wastewater is carried out by means of dominant bacteria; moreover, the adding amount of dominant bacteria suspension is between 15 and 30g/L, while hydraulic residence time is controlled between 8 and 30 hours and the concentration of dissolved oxygen is controlled between 2 and 8mg/L; the mixed solution is settled for 0.5 to 2 hours after aerobic treatment, and then is filtered and separated by a nanofiltration membrane filter under the condition that the concentration of dissolved oxygen is controlled between 2 and 8mg/L; and generated penetrating fluid is reclaimed for recycling or is discharged directly. The technological method improves the utilization rate of bacteria and further simplifies both treatment process and treatment steps; moreover, the technological method improves the treatment effect on the paper-making wastewater.

Description

Based on membrane biological reaction apparatus process for treating papermaking waste water method
Technical field
The invention belongs to sewage treatment area, relate in particular to a kind of bio-reactor and film filter coupling process for treating papermaking waste water method.
Background technology
Paper industry is a mainstay industry of China, and according to statistics, national paper industry waste discharge amount was 35.6 hundred million tons in 2007, accounted for 16.1% of national trade effluent total release, occupied second; The COD quantity discharged is 168.2 ten thousand tons in the waste discharge, accounts for 33.0% of COD total emission volumn in the national trade effluent, is national first pollution industry.The raw material of China's papermaking enterprise is based on non-wood, the black liquid of slurrying production process discharging is the principal pollutant of environment, paper-making effluent concentration height, COD, BOD content are big, the treatment technology of straw pulp black liquor worldwide also solves fully, and particularly the papermaking enterprise of middle scale more is weak in this respect, we can say, with the straw pulp is the medium and small paper mill of raw material, produces promptly representing and pollutes.At present, timber accounts for more than 93% in the global paper making raw material.Main in the world papermaking country; as the U.S., Canada, Japan, Sweden, Finland etc. almost all use lumber fibre papermaking; why extensively adopting timber papermaking, is because timber is more suitable for the every requirement of modern paper industry to industrial scale, technological improvement, quality product and environment protection.Select timber as paper making raw material, can enlarge scope of the enterprise, improve product quality, and aspect the control pollution sophisticated technology is being arranged also; Simultaneously, can impel industry to develop as raw material, so China also greatly develops pulping wood papermaking in recent years to the recycling economy direction with timber.
The compound that paper-making effluent contains is mainly derived from the chemical that adds in the used timber of slurrying or other plant fiber material and the production process.Raw material that adopts and production process can greatly influence the composition of waste water, and wherein pulping process is particularly remarkable to the waste water composition influence.Adopt characteristics such as the high yield cooking Technology has the pulping yield height, raw material consumption is low, pollution is light, the paper pulp suitability is extensive; Adopt do not produce organic chloride newly float agent, it is a lot of that BOD, COD in the bleaching effluent and AOX equal size are lacked than chemical pulp, the pollution load of production process discharging waste liquid alleviates, the recycling of waste liquid is fairly simple, the waste water of discharging has biodegradability.
The bio-reactor that is applied to pulp and paper effluent treatment both at home and abroad at present mainly contains aerobic type and anaerobic type bio-reactor, as high-efficient biological reactor (high performance compact reactor HCR), biological fluidized bed, BAF (biological aerated filter, be called for short BAF), membrane bioreactor (membrane biology reactor, MBR), up-flow anaerobic sludge blanket, other composite type bioreactor, floating stuffing biological reactor etc.Along with high yield pulping wood paper-making technique replaces the non-wood pulping paper-making technique, original bio-reactor has been subjected to the challenge that requires from each side.So develop, study and use new and effective biological process of wastewater treatment,, become the important topic of countries in the world water pollution control engineering area research as bio-reactor and the combination of membrane separation apparatus, the combination process that biological treatment combines with chemical treatment.
Nanosecond science and technology are the theme science in forward position in the leading science of 21 century, nano material and technology are subject branch most active in the nanosecond science and technology field, that research contents is very abundant, if nanotechnology can be applied in the paper waste bio-reactor, and in conjunction with nanofiltration membrane bio-reactor and high-efficiency aerobic type bio-reactor, develop a kind of combination process of novel wood pulp papermaking wastewater treatment, this will have high practical value and realistic meaning to the processing of paper-making industrial waste water from now on.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, provide that a kind of bioavailability height, processing step are simple, good waste water treatment effect based on membrane biological reaction apparatus process for treating papermaking waste water method.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is a kind of based on membrane biological reaction apparatus process for treating papermaking waste water method, may further comprise the steps:
(1) aerobic treatment: influent waste water is handled the back advanced person oxygen of acting charitably through first settling tank and is handled, and utilizes dominant bacteria that waste water is carried out sedimentation and degraded in the aerobic treatment process, and the addition of dominant bacteria bacteria suspension is 15～30g/L; Hydraulic detention time during aerobic treatment is 8～30 hours, and dissolved oxygen concentration is controlled at 2～8mg/L; Described dominant bacteria generally is with the synchronized culture method screening of concentrated back is tamed, separated to active sludge to obtain, described dominant bacteria can be any one bacterium in Rhodopseudomonas, the Gordona, toxic organic pollutants such as the xylogen in its paper waste of can effectively degrading, arene;
(2) precipitation process: the mixed solution precipitation 0.5～2h after aerobic treatment;
(3) membrane filtration is handled: the clear liquor after the precipitation process is through nanofiltration membrane strainer filtering separation, the nanofiltration membrane strainer is to filter under the condition of 2～8mg/L at dissolved oxygen concentration, filter penetrating fluid recycling use or directly discharging that the back produces, dominant bacteria can continue on for the aerobic treatment operation after refluxing.
Above-mentioned influent waste water mainly is meant the waste water that derives from the different workshop sections of wood pulp papermaking, mainly contain fiber fines and the timber organic matter that becomes to grade in the different workshop sections waste water, different workshop sections waste water is at first through solid-liquid separation, and chemical oxygen demand (COD) (CODcr) enters preliminary sedimentation tank as influent waste water after being controlled at 1200～3000mg/L.
Above-mentioned aerobic treatment process is to carry out in the aerobic treatment pond, above-mentioned precipitation process process is to carry out in settling tank, and the membrane filtration processing is to be undertaken by the nanofiltration membrane strainer, described aerobic treatment pond, settling tank and nanofiltration membrane strainer constitute membrane biological reaction apparatus, each assembly of membrane biological reaction apparatus all can be controlled automatically, the degree of integration height, but service data and water quality data online acquisition are handled.Described nanofiltration membrane strainer can adopt intrusive mood or external placed type to install, and the material of the nanofiltration membrane that the nanofiltration membrane strainer is selected for use is that the hydrophilic inorganic of modification supports mesoporous material, preferred nanometer titanium dioxide silicon materials; The aperture of described nanofiltration membrane is preferably 2～50nm.
A processing cycle of above-mentioned processing method (being a cycle of operation of membrane biological reaction apparatus) is 5～20 minutes, backwash 5～30 seconds, and backwash water is that membrane biological reaction apparatus produces water (penetrating fluid that promptly obtains after treatment).The cleaning of nanofiltration membrane adopts online dosing reinforcement backwash to combine with the off-line matting in the nanofiltration membrane strainer, clean weekly, and chemical agent acid, alkali, oxygenant or sterilant, the life cycle of nanofiltration membrane is 360 days.
Biological treatment is as economic, reasonable, effective water pollution control means, remain indispensable important component part in the paper waste processing, compare with existing simple biologic treating technique, the invention has the advantages that and used membrane biological reaction apparatus, this has increased the retention time of dominant bacteria in membrane biological reaction apparatus greatly, making it can be repeatedly, use continuously, has improved the utilization ratio of biological bacterium; And at the characteristics of high-efficiency cleaning pulping wood paper waste, the present invention adopts membrane biological reaction apparatus that nanofiltration membrane strainer and high-efficiency aerobic type biological respinse treating pond the combine main equipment as processing method, utilize the absorption of nanofiltration membrane to hold back biochemical treatment with dominant bacteria, make pulping wood technological process for the treatment of papermaking effect be greatly improved, step is also simplified greatly.In addition, the present invention adopts nano material to carry out the preparation of nanofiltration membrane filter assemblies, this has not only strengthened the fractionation by adsorption of membrane biological reaction apparatus to pollutent, reduced the film pollution, and because the nano material particle diameter is little, specific surface is big, bioavailability with can further improving membrane biological reaction apparatus after the biological treatment coupling improves the usefulness of wastewater treatment.
Therefore, the advantage of processing method of the present invention is integrated nanofiltration membrane filtration process and biological respinse treatment process, realized the efficient advanced treatment of paper waste, the every after testing index of penetrating fluid after the processing all is better than the paper water, satisfy the water requirement of paper technology, but direct reuse has been realized the cycling and reutilization of paper waste in paper; Simultaneously, the penetrating fluid after the processing is allow compliance with emission standards also, directly qualified discharge.Processing method of the present invention can be widely used in the processing of slurrying factory effluent, paper waste water, and the improvement that environment protection and water are polluted has positive effect.
Description of drawings
Fig. 1 is the process flow sheet of processing method of the present invention.
Embodiment
Embodiment 1
Certain paper mill is paper making raw material with the poplar, and the water quality detection indication range of different workshop sections waste water is: chemical oxygen demand (COD) (CODcr) 1800～6000mg/L, and suspended solids (SS) is 700～1500mg/L, the pH value is 7～9.Mainly contain fiber fines and the timber organic matter that becomes to grade in the different workshop sections waste water.As shown in Figure 1, the water inlet as treatment process of the present invention after solid-liquid separation of different workshop section's waste water enters preliminary sedimentation tank, behind preliminary sedimentation tank, enter membrane biological reaction apparatus, membrane biological reaction apparatus mainly is made of aerobic treatment pond, settling tank and nanofiltration membrane strainer, each assembly is controlled automatically by PLC, and the wastewater treatment capacity of this device is 0.1m 3/ h.
As shown in Figure 1, paper waste behind preliminary sedimentation tank at first enters in the aerobic treatment pond, be added with dominant bacteria---the Pseudomonas alcaligenes (Pseudomonas alcaligenes) that from the active sludge of paper waste domestication, filters out in the aerobic treatment pond, the addition of bacteria suspension is 15g/L, hydraulic detention time 16 hours, dissolved oxygen concentration maintains 4mg/L; Carry out membrane filtration again and handle behind the precipitation of the mixed solution after aerobic treatment 0.5h, the nanofiltration membrane area of nanofiltration membrane strainer is 1m 2, and adopt the hydrophilic inorganic of 40nm to support mesoporous silicon dioxde film, and keeping the certain aeration intensity of nanofiltration membrane, dissolved oxygen concentration maintains 4mg/L, and the penetrating fluid that produces after membrane filtration is handled is recyclable to be recycled or directly discharging.The cycle of operation of whole membrane biological reaction apparatus is 8 minutes, backwash 20 seconds.
The water treatment effect of present embodiment is as follows:
Figure A20081014323600061
Embodiment 2:
The wastewater treatment capacity of waste water quality, membrane biological reaction apparatus and membrane biological reaction apparatus that present embodiment is pending is all identical with embodiment 1.
As shown in Figure 1, paper waste behind preliminary sedimentation tank at first enters in the aerobic treatment pond, be added with dominant bacteria---the genial Gordon Salmonella (Gordonia amicalis) that from the active sludge of paper waste domestication, filters out in the aerobic treatment pond, the bacteria suspension addition is 20g/L, hydraulic detention time 18 hours, dissolved oxygen concentration maintains 4mg/L; Carry out membrane filtration again and handle behind the precipitation of the mixed solution after aerobic treatment 0.5h, the nanofiltration membrane area of nanofiltration membrane strainer is 1m 2, and adopt the hydrophilic inorganic of 20nm to support mesoporous silicon dioxde film, and keeping the certain aeration intensity of nanofiltration membrane, dissolved oxygen concentration maintains 6mg/L, and the penetrating fluid that produces after membrane filtration is handled is recyclable to be recycled or directly discharging.The cycle of operation of whole membrane biological reaction apparatus is 12 minutes, backwash 20 seconds.
The water treatment effect of present embodiment is as follows:
Figure A20081014323600062

Claims (5)

1, a kind of based on membrane biological reaction apparatus process for treating papermaking waste water method, may further comprise the steps:
(1) aerobic treatment: influent waste water is handled the back advanced person oxygen of acting charitably through first settling tank and is handled, utilize dominant bacteria that waste water is carried out sedimentation and degraded in the aerobic treatment process, the addition of dominant bacteria bacteria suspension is 15～30g/L, hydraulic detention time 8～30 hours, and dissolved oxygen concentration is controlled at 2～8mg/L;
(2) precipitation process: mixed solution precipitation 0.5～2h after aerobic treatment;
(3) membrane filtration is handled: the clear liquor after the precipitation process is through nanofiltration membrane strainer filtering separation, and the nanofiltration membrane strainer is to filter under the condition of 2～8mg/L at dissolved oxygen concentration, filters the penetrating fluid recycling use that the back produces or directly discharges.
2, processing method according to claim 1 is characterized in that described dominant bacteria is with the synchronized culture method screening of concentrated back is tamed, separated to active sludge to obtain, and described dominant bacteria is any one bacterium in Rhodopseudomonas, the Gordona.
3, processing method according to claim 1, it is characterized in that described nanofiltration membrane strainer is to adopt intrusive mood or external placed type to install, the material of the nanofiltration membrane that the nanofiltration membrane strainer is selected for use is that the hydrophilic inorganic of modification supports mesoporous material, and the aperture of described nanofiltration membrane is 2～50nm.
4, processing method according to claim 3 is characterized in that it is the nanometer titanium dioxide silicon materials that described hydrophilic inorganic supports mesoporous material.
5, processing method according to claim 1 is characterized in that a processing cycle of described processing method is 5～20 minutes, backwash 5～30 seconds, the penetrating fluid of backwash water for obtaining after treatment.
CN2008101432365A 2008-09-18 2008-09-18 Papermaking waste water processing technological process based on membrane biological reactor Active CN101348313B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104229985A (en) * 2014-10-17 2014-12-24 苏州新协力环保科技有限公司 Activated sludge purifying and processing method for wastewater

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104229985A (en) * 2014-10-17 2014-12-24 苏州新协力环保科技有限公司 Activated sludge purifying and processing method for wastewater

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