CN103011502B - Method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using ultrafiltration membrane - Google Patents
Method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using ultrafiltration membrane Download PDFInfo
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- CN103011502B CN103011502B CN201210525476.8A CN201210525476A CN103011502B CN 103011502 B CN103011502 B CN 103011502B CN 201210525476 A CN201210525476 A CN 201210525476A CN 103011502 B CN103011502 B CN 103011502B
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Abstract
The invention discloses a method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using ultrafiltration membrane. The method for deeply treating waste paper pulping and papermaking comprehensive wastewater by using an ultrafiltration membrane comprises the following main steps of: filling outflowing water of a secondary treatment workstation of the waste paper pulping and papermaking wastewater into an intermittent plate-type membrane filter; and through an ultrafiltration membrane separation process, respectively obtaining concentrated solution and permeated solution of waste paper pulping and papermaking comprehensive wastewater after deep membrane separation, wherein the permeated solution can be directly recycled in a waste paper pulping and papermaking workstation or discharged out after reaching the standard. The method is quick, high in efficiency and free of secondary pollution, and is particularly applicable to a deep treatment process of the waste paper pulping and papermaking comprehensive wastewater; deep ultrafiltration membrane treatment is performed on the outflowing water of the secondary treatment workstation of the waste paper pulping and papermaking comprehensive wastewater, so that the wastewater purifying efficiency is further improved, a vast majority of the waste paper pulping and papermaking comprehensive wastewater is recycled, the clear water consumption in a production process is reduced, and the pollution load of the discharged wastewater is reduced; therefore, the method has a significant meaning in practical production.
Description
Technical field
The present invention relates to a kind of method of membrane sepn advanced treatment waste paper making wastewater, particularly a kind of method of utilizing ultra-filtration membrane advanced treatment wastepaper pulping and papermaking comprehensive wastewater, belongs to Pulp and Paper Engineering field.
Background technology
Paper industry is the important foundation starting material industry of national economy, and the consumption of paper and cardboard has become the important symbol of weighing a modernization of the country level and civilization degree.Utilize the pulping and papermaking processes that waste paper is raw material, not only can save natural fiber resource, reuse waste material, also can reduce paper-making process disposal of pollutants load, conservation of nature environment.Waste Water of Pulp and Paper Making from Waste Paper is mainly derived from the workshop sections such as slurrying, deinking, bleaching, making beating, purification screening and the wet end of machine of waste paper, has quantity discharged large, containing the suspended substances such as ink, fiber, filler and auxiliary agent, SS, COD
cr, BOD
5high etc. pollution index, color is darker, containing features such as toxicity muriates.At present, the waste water that wastepaper pulping and papermaking enterprise produces mainly adopts traditional second-stage treatment mode, and the waste water grid of first flowing through, holds back and remove light weight sundries; Then process settling pit is removed sandstone, settling tank is removed heavy foreign material; Enter again anaerobism+aerobic treatment system, remove the organic pollution materials that is colloid and dissolved state in waste water to reduce contaminated wastewater load.
On June 25th, 2008, Environmental Protection Department and State General Administration for Quality Supervision combine and have issued " pulp and paper industry pollution discharge standard " (GB3544-2008), and come into effect in 1 day August in 2008.With respect to GB3544-2001 standard, COD in " new standard "
cr, BOD
5, SS index emission limit reduced about 50-70%; colourity, total nitrogen, total phosphorus, ammonia nitrogen and AOX emission limit have been increased simultaneously; need the water body of laying special stress on protecting for easy generation water environment pollution problem, also formulated the special emission limit of water pollutant.Under this national policy background, if continuing to continue to use traditional second-stage treatment mode, wastepaper pulping and papermaking enterprise processes waste water, will be difficult to reach country's " new standard " emission request; On the other hand, if this kind of mode processed to water outlet direct reuse in wastepaper pulping and papermaking workshop section, dissolve organism and dissolved salt due to what have that second-stage treatment is difficult to remove, the constantly accumulation in process of production of these materials, easily cause " anionic trash " to gather in Waste Paper Handling system, not only can system operation be caused in various degree and be destroyed, and quality of finished paper can be produced and be had a strong impact on.
Introduce first pulp and paper industry field from 20 century 70 membrane separation techniques, experienced the development of more than 40 year, the bleaching liquor that is mainly used at present pulping and papermaking processes purifies, coating reclaims and the wastewater treatment working section such as paper waste water recycling.In Waste Water of Pulp and Paper Making from Waste Paper advanced treatment field, the advanced waste treatment system that Chinese patent (ZL200810119225.3) " a kind of deep treatment method of Waste Water of Pulp and Paper Making from Waste Paper and treatment system " utilization is in turn connected to form by Pre-coagulation pond, coagulation reaction tank, coagulative precipitation tank, advanced oxidation treatment unit, device for catalyzing and oxidating ozone and microbial film catalytic oxidation device is processed Waste Water of Pulp and Paper Making from Waste Paper, make water outlet not only reach first discharge standard, and can reach the requirement of industrial reuse water; Chinese patent (ZL200910098176.4) " a kind of waste paper making wastewater is processed and reuse method " adopts efficient sedimentation tank, reduce added amount of chemical, reduce the anionic trash of reusing sewage, water outlet and twice reusing sewage of biochemical treatment water outlet are filtered in the dirt of receiving, and have improved the reclamation rate of waste paper making wastewater; Chinese patent (ZL200910098178.3) " technique of composite anaerobic aerobic treatment waste paper making wastewater " utilizes anaerobic grain sludge to adsorb tiny fiber, reduce anaerobic filter filtrate balling, improve anaerobic treatment whole structure, realized sewage treatment facility steady running, reduced the object of sewage disposal running cost; United States Patent (USP) (US005846378A) " Treatment of solid containing material derived from effluent of wastepaper treating plant " adopts high-temperature calcination technical finesse deinked waste paper paper-making effluent, make organic substance and moisture decomposition evaporation in its waste water, obtain the inorganic components such as calcium oxide, for the production of filler; United States Patent (USP) (US005683590A) " Treatment of waste paper " adopts method persistently overheating in oxygen atmosphere to process Waste Water of Pulp and Paper Making from Waste Paper, make the organic substance oxygenolysis in its waste water, obtain finely dispersed carbon granule in the aqueous solution, for the preparation of other organic materialss.So far, yet there are no and utilize the related process technology of membrane separation technique advanced treatment wastepaper pulping and papermaking comprehensive wastewater to occur.
Therefore, in view of the sternness increasingly of paper industry Environmental Protection Situation, pollute to reach country's " new standard " emission request in order to realize reduction water outlet, increase the target that cyclically utilizing consumes to reduce clear water, the new membrane that exploitation is suitable for Waste Water of Pulp and Paper Making from Waste Paper separates advanced treatment cyclically utilizing technology, and meaning is particularly important.
Summary of the invention
High in order to overcome the ubiquitous wastewater emission amount of current wastepaper pulping and papermaking enterprise, ambient pollution burden is large, production rinse dosage is many, be difficult to reach the practical problemss such as country's " new standard ", the object of this invention is to provide a kind of method of utilizing ultra-filtration membrane advanced treatment wastepaper pulping and papermaking comprehensive wastewater.
For achieving the above object, technical scheme of the present invention is to adopt following steps:
1) wastepaper pulping and papermaking comprehensive wastewater is filtered through 60 order slanted screens, slanted screen setting angle 40 is spent, and obtains the pre-filtering waste water that solid substance particle diameter is less than or equal to 0.3mm;
2) to step 1) drop into 0.3 ~ 0.5mg/L polymerize aluminum chloride in the pre-filtering waste water that obtains, rapid stirring 5 ~ 10min, then drop into 0.1 ~ 0.2mg/L polyacrylamide, sedimentation 10 ~ 20min after stirring, carry out mud-water separation and get supernatant liquid, be flocculation sediment and process water outlet;
3) by step 2) flocculation sediment that obtains processes water outlet to add activated sludge concentration is in 2600 ~ 2800g/L aeration tank, continuous aeration 24h, above-mentioned aeration process dissolved oxygen is controlled between 4 ~ 5mg/L, carries out mud-water separation and gets supernatant liquid, is aerobic treatment water outlet;
4) by step 3) the aerobic treatment water outlet that obtains passes into intermittently board-like film filter, by adjusting intermittently board-like film filter mechanical stirring on-off control film filter internal rotor rotating speed 100 ~ 300rpm, by 30 ~ 50 ℃ of adjustment board-like film filter heater switch control pre-filtering wastewater temperatures at intermittence, by adjusting pressure 0.1 ~ 0.3MPa in board-like film filter nitrogen on-off control film filter at intermittence, separate and see through the long-pending controlling diaphragm sepn process volume minimizing of liquid factor arrival 0.8 ~ 0.9 by metering film, stop whole membrane sepn process, finally obtain respectively the concentrated solution of wastepaper pulping and papermaking comprehensive wastewater membrane sepn advanced treatment and see through liquid.
Described wastepaper pulping and papermaking comprehensive wastewater is the one in the comprehensive wastewater that produces of old corrugated container, outdated magazine paper, old newsprint pulping and papermaking processes.
Described ultra-filtration membrane is the one in poly (ether sulfone) film, PVDF membrane, regenerated cellulose film, and its molecular weight cut-off is 50 ~ 100kDa.
Above-mentioned steps 4) in volume reduce the factor (VRF) be Volume Reduction Factor, different documents has different translations, what have is called enrichment factor, the volume that is called having reduces the factor, as the patent ZL200910236506.1 " a kind of membrane concentration of alkaline hydrogen peroxide chemical-mechanical pulping waste water and reuse method " authorizing.
Compared with background technology, the beneficial effect that the present invention has is:
Ultra-filtration membrane advanced treatment is proceeded in the water outlet of wastepaper pulping and papermaking comprehensive wastewater tradition second-stage treatment workshop section by the present invention, further improve the purification efficiency of waste water, under the prerequisite of the operation of not impact system and quality product, realize wastepaper pulping and papermaking comprehensive wastewater overwhelming majority cyclically utilizing, thereby reduce the consumption of production process clear water, reduce efflux wastewater pollution load simultaneously, reached country's " new standard " emission request, there is important economic and social benefit.
Accompanying drawing explanation
Fig. 1 is the membrane flux temporal evolution curve that embodiment 1 utilizes poly (ether sulfone) film advanced treatment wastepaper pulping and papermaking comprehensive wastewater.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1:
1) comprehensive wastewater old corrugated container pulping and papermaking processes being produced filters through 60 order slanted screens, and slanted screen setting angle 40 is spent, and obtains the pre-filtering waste water that solid substance particle diameter is less than or equal to 0.3mm;
2) to step 1) drop into 0.5mg/L polymerize aluminum chloride in the pre-filtering waste water that obtains, rapid stirring 10min, then drop into 0.2mg/L polyacrylamide, sedimentation 20min after stirring, carry out mud-water separation and get supernatant liquid, be flocculation sediment and process water outlet;
3) by step 2) flocculation sediment that obtains processes water outlet to add activated sludge concentration is in the aeration tank of 2800g/L, continuous aeration 24h, above-mentioned aeration process dissolved oxygen is controlled at 5mg/L, carries out mud-water separation and gets supernatant liquid, is aerobic treatment water outlet;
4) by step 3) the aerobic treatment water outlet that obtains passes into intermittently board-like film filter, select the poly (ether-sulfone) ultrafiltration membrane of molecular weight cut-off 50kDa to carry out membrane sepn, by adjusting intermittently board-like film filter mechanical stirring on-off control film filter internal rotor rotating speed 300rpm, by 50 ℃ of adjustment board-like film filter heater switch control pre-filtering wastewater temperatures at intermittence, by adjusting pressure 0.3MPa in board-like film filter nitrogen on-off control film filter at intermittence, separate the volume minimizing factor arrival 0.85 that sees through the long-pending controlling diaphragm sepn process of liquid by metering film, stop whole membrane sepn process, finally obtain respectively the concentrated solution (a) of wastepaper pulping and papermaking comprehensive wastewater membrane sepn advanced treatment and see through liquid (a).
Embodiment 2:
1) comprehensive wastewater outdated magazine paper pulping and papermaking processes being produced filters through 60 order slanted screens, and slanted screen setting angle 40 is spent, and obtains the pre-filtering waste water that solid substance particle diameter is less than or equal to 0.3mm;
2) to step 1) drop into 0.3mg/L polymerize aluminum chloride in the pre-filtering waste water that obtains, rapid stirring 5min, then drop into 0.1mg/L polyacrylamide, sedimentation 10min after stirring, carry out mud-water separation and get supernatant liquid, be flocculation sediment and process water outlet;
3) by step 2) flocculation sediment that obtains processes water outlet to add activated sludge concentration is in the aeration tank of 2600g/L, continuous aeration 24h, above-mentioned aeration process dissolved oxygen is controlled at 4mg/L, carries out mud-water separation and gets supernatant liquid, is aerobic treatment water outlet;
4) by step 3) the aerobic treatment water outlet that obtains passes into intermittently board-like film filter, select the poly (ether-sulfone) ultrafiltration membrane of molecular weight cut-off 100kDa to carry out membrane sepn, by adjusting intermittently board-like film filter mechanical stirring on-off control film filter internal rotor rotating speed 200rpm, by 40 ℃ of adjustment board-like film filter heater switch control pre-filtering wastewater temperatures at intermittence, by adjusting pressure 0.2MPa in board-like film filter nitrogen on-off control film filter at intermittence, separate the volume minimizing factor arrival 0.9 that sees through the long-pending controlling diaphragm sepn process of liquid by metering film, stop whole membrane sepn process, finally obtain respectively the concentrated solution (b) of wastepaper pulping and papermaking comprehensive wastewater membrane sepn advanced treatment and see through liquid (b).
Embodiment 3:
1) comprehensive wastewater old newsprint pulping and papermaking processes being produced filters through 60 order slanted screens, and slanted screen setting angle 40 is spent, and obtains the pre-filtering waste water that solid substance particle diameter is less than or equal to 0.3mm;
2) to step 1) drop into 0.4mg/L polymerize aluminum chloride in the pre-filtering waste water that obtains, rapid stirring 10min, then drop into 0.2mg/L polyacrylamide, sedimentation 15min after stirring, carry out mud-water separation and get supernatant liquid, be flocculation sediment and process water outlet;
3) by step 2) flocculation sediment that obtains processes water outlet to add activated sludge concentration is in the aeration tank of 2700g/L, continuous aeration 24h, above-mentioned aeration process dissolved oxygen is controlled at 5mg/L, carries out mud-water separation and gets supernatant liquid, is aerobic treatment water outlet;
4) by step 3) the aerobic treatment water outlet that obtains passes into intermittently board-like film filter, select the poly (ether-sulfone) ultrafiltration membrane of molecular weight cut-off 100kDa to carry out membrane sepn, by adjusting intermittently board-like film filter mechanical stirring on-off control film filter internal rotor rotating speed 100rpm, by 30 ℃ of adjustment board-like film filter heater switch control pre-filtering wastewater temperatures at intermittence, by adjusting pressure 0.1MPa in board-like film filter nitrogen on-off control film filter at intermittence, separate the volume minimizing factor arrival 0.8 that sees through the long-pending controlling diaphragm sepn process of liquid by metering film, stop whole membrane sepn process, finally obtain respectively the concentrated solution (c) of wastepaper pulping and papermaking comprehensive wastewater membrane sepn advanced treatment and see through liquid (c).
What mensuration embodiment 1,2,3 obtained sees through liquid contamination index.The characterization result that see through liquid contamination index of table 1 for being obtained by embodiment 1,2,3.From table 1 data, what adopt ultra-filtration membrane separation advanced treatment of the present invention acquisition sees through liquid (a), (b), (c) total solid at 46 ~ 105mg/L, COD
crat 15 ~ 45mg/L, BOD
5at 10 ~ 30mg/L, colourity is at 5 ~ 25 times, all can meet the water requirement of recycled fiber pulping and paper-making workshop section, wherein reach pulp and paper industry Sewage Water Emissions " new standard " requirement through liquid (b), (c), directly outer row.
As Fig. 1, in embodiment 1, adopt poly (ether-sulfone) ultrafiltration membrane advanced treatment old corrugated container pulping and papermaking effluent, the waste water flux of membrane sepn process tends towards stability after 0.5h, maintains 15L/m
2.h, about, substantially can meet the waste water advanced processing demands of actual production.
Table 1
What more than enumerate is only specific embodiments of the invention.The invention is not restricted to above embodiment, can also have many distortion.All distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention, all should think protection scope of the present invention.
Claims (1)
1. a method of utilizing ultra-filtration membrane advanced treatment wastepaper pulping and papermaking comprehensive wastewater, is characterized in that, step is as follows:
1) wastepaper pulping and papermaking comprehensive wastewater is filtered through 60 order slanted screens, slanted screen setting angle 40 is spent, and obtains the pre-filtering waste water that solid substance particle diameter is less than or equal to 0.3mm;
2) to step 1) drop into 0.3～0.5mg/L polymerize aluminum chloride in the pre-filtering waste water that obtains, rapid stirring 5～10min, then drop into 0.1～0.2mg/L polyacrylamide, sedimentation 10～20min after stirring, carry out mud-water separation and get supernatant liquid, be flocculation sediment and process water outlet;
3) by step 2) flocculation sediment that obtains processes water outlet to add activated sludge concentration is in 2600～2800g/L aeration tank, continuous aeration 24h, above-mentioned aeration process dissolved oxygen is controlled between 4～5mg/L, carries out mud-water separation and gets supernatant liquid, is aerobic treatment water outlet;
4) by step 3) the aerobic treatment water outlet that obtains passes into intermittently board-like film filter, by adjusting intermittently board-like film filter mechanical stirring on-off control film filter internal rotor rotating speed 100～300rpm, by 30～50 ℃ of adjustment board-like film filter heater switch control pre-filtering wastewater temperatures at intermittence, by adjusting pressure 0.1～0.3MPa in board-like film filter nitrogen on-off control film filter at intermittence, separate and see through the long-pending controlling diaphragm sepn process volume minimizing of liquid factor arrival 0.8～0.9 by metering film, stop whole membrane sepn process, finally obtain respectively the concentrated solution of wastepaper pulping and papermaking comprehensive wastewater membrane sepn advanced treatment and see through liquid, described ultra-filtration membrane is PVDF membrane, one in regenerated cellulose film, its molecular weight cut-off is 50～100kDa, described wastepaper pulping and papermaking comprehensive wastewater is outdated magazine paper, one in the comprehensive wastewater that old newsprint pulping and papermaking processes produces.
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| CN103922505B (en) * | 2014-04-14 | 2015-11-04 | 浙江理工大学 | A kind of method utilizing nanofiltration membrane advanced treatment Tea Bag Paper mthod of white water from paper making |
| CN103991982B (en) * | 2014-05-26 | 2015-07-08 | 浙江理工大学 | Method for performing coagulation treatment on waste paper pulping comprehensive papermaking wastewater by utilizing cellulose-based flocculating agent |
| CN112777849A (en) * | 2020-12-15 | 2021-05-11 | 南京万德斯环保科技股份有限公司 | Comprehensive treatment system and method for landfill leachate |
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