CN1710193A - Process for realizing waste-water zero-discharge of papermaking from waste paper by anaerobic-aerobic treatment - Google Patents
Process for realizing waste-water zero-discharge of papermaking from waste paper by anaerobic-aerobic treatment Download PDFInfo
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- CN1710193A CN1710193A CN 200510042779 CN200510042779A CN1710193A CN 1710193 A CN1710193 A CN 1710193A CN 200510042779 CN200510042779 CN 200510042779 CN 200510042779 A CN200510042779 A CN 200510042779A CN 1710193 A CN1710193 A CN 1710193A
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Abstract
The invention discloses anaerobic-aerobic process achieving making paper with waste paper without waste water emission. Filter the fiber in waste water from production line as raw material. The waste water in which fiber is recycled is then sent to a sink pool and water pool 1, the rest sent to an anaerobic reactor softening and removing organic pollution by micorbion. With bio-technique of low cost, the waste water soften and purify are achieved at the same time, resolving
Description
Technical field
The present invention relates to environmental project, water pollution control and water-saving technology field are particularly realized the reuse of paper-making industrial waste water and the treatment process of zero-emission.
Background technology
It is the technology that domestic and international water pollution control field primary study solves that paper-making industrial waste water is administered technology always.Notion in the circulation of paper machine room whitewater closure has been proposed both at home and abroad very early, some European paper mills also once waste paper be raw material factory work the trial of zero-emission.Zero-emission means the saving of water resource and the control fully that water pollutes, and also means the recovery of the material and the energy, is the important technology that embodies recycling industries and clean production thought.But, paper-making process waste water recycle the accumulation that must cause harmful substance.In common production system, for certain output, the concentration of waste water and its displacement are inversely proportional to, and draining is few more, and concentration is big more.And for the Zero discharging system that does not have discharge of wastewater fully, pollutant must run up to high level, if there is not rational circulating water treatment to eliminate this accumulation, and reaches the requirement of paper-making process to quality, and zero-emission is impossible realize.
Meanwhile, advantages such as the Anaerobic Treatment technology of waste water is low with its operating cost, energy savings, surplus sludge volume is few, sludge treatment is easy are just being brought into play increasing effect in wastewater treatment.At present the Anaerobic Treatment technology abroad in the paper industry main field of using comprise Waste Water of Pulp and Paper Making from Waste Paper, mechanical pulp and chemi-mechanical pulp (TMP, CTMP and APMP) waste water, semi-chemical pulp (NSSC) waste water and alkaline process black liquor vaporizing condensate liquid.But the anaerobism technology is but seldom used in China's paper industry wastewater treatment, and the anaerobism technology is polluted at China's paper-making industrial waste water and had big gap and very big development space in the control field.
Recycling of paper-making process from waste paper water generally is easy to generate following problem:
(1) growth of microorganism problem
The microorganism that forms mucus and filamentous growth is because of being easy to growth attached to wall, and the microorganism of agglomerating band mucus forms so-called rotten the slurry with fiber, causes the paper defects such as cavity, brocken spectrum of paper, even causes the broken end of manufacturing paper with pulp.
The raised growth of microorganism mainly due to closed circulation after dissolved organic matter matter accumulate (for example a large amount of volatile fatty acids) in a large number, simultaneously water temperature rises, for growth of microorganism has been created condition.
(2) sicker
Sicker is meant the hydrophobic with adhesivity that forms in the technical process and the material of part hydrophobic, perhaps from the printing-ink in the wastepaper as raw material, adhesive, coating component and various additives.Sicker may reside in the water, also can be deposited on felt, copper mesh and miscellaneous equipment surface, the harm paper-making process.
(3) anion
Anionic trash is the anion harmful to paper-making process dissolving or colloid, and they can cause the paper making wet part additive amount to increase or the speed of a motor vehicle reduces.
Anion is mainly from the additive of paper-making process, for example the coating component of converted starch, carboxymethyl cellulose and paper.
(4) accumulation of salt and etching problem
CaCO in the waste water
3With a large amount of volatile fatty acid (VFA) slow reactions, generate CO
2, cause bubble and foam, influence the paper machine operation, produce paper defects and broken end.Ca
2+Also can with VFA, resin acid, SO
4 2-Particularly wet end forms calcium resinate and gypsum dirt layer on the surface of paper machine, causes the operating trouble of sticking with paste similar pitch troubles such as net.
The accumulation of salt also can cause chemistry and electrochemical corrosion.SO
4 2-Play an important role in corrosion, corrosion is caused by high concentration VFA that also the growth of bacterium causes etching problem equally.The rising of temperature has increased corrosion rate.
Summary of the invention
The object of the invention is to provide a kind of and handles waste paper making wastewater by anaerobic-aerobic, can realize the reuse of paper waste and non-wastewater discharge completely, be zero-emission, and can reduce paper production cost and cost for wastewater treatment, energy savings, water resource and raw material.
Technical scheme of the present invention is achieved in that
At first, the waste water D that board production is produced is a recirculated water, the fiber in garden net filtration recovery waste water, and as paper making raw material paper pushing board production line, garden net mesh is 60 orders, the waste water after the recycled fiber enters a heavy pond and 1 in proper order
#Collecting tank, the flow rate of water are controlled to be paper 30-60 cubic meter per ton, 1
#40-70% water can be used as recycle-water A feedboard production line in the collecting tank, and all the other water are sent into anaerobic reactor, under following controlled condition, by the removal of microorganisms organic pollution and produce biological emollescence; Load 8-12kgCOD/m
3.d under the condition, it is that 6.8-7.2, sludge concentration 25-30gVSS/L, mud 150-200 in age day, water outlet volatile fatty acid are less than 3mmol/l that the service condition of anaerobic reactor (4) is controlled to be pH;
Secondly, Aerobic Pond is sent in the water outlet of anaerobic reactor carried out the aerobe processing, the volumetric loading of Aerobic Pond is 1-2kgCOD/m
3.d, the condition of Aerobic Process for Treatment is: pH is 7.5-8.0, hydraulic detention time 10-16 hour, oxygen content 1-4mg/L, in Aerobic Pond, adopt Gas feeding low pressure stream aerator, water after the Aerobic Process for Treatment flows into second pond, second pond carries out mud-water separation, surface loading is 1.0-1.2m3/m2.h, bottom mud is sent anaerobic reactor back to, the sludge quantity of sending anaerobic reactor back to is the one thousandth of papermaking output, and the top clear water is to have removed organic matter and softening recirculated water, chemical oxygen demand COD＜100mg/l, biochemical oxygen demand (BOD) BOD＜30mg/l, they enter 2
#Collecting tank, wherein 50-60% is back to board production as recycle-water B, and remainder is through rapid filter, and rate of filtration 7-8m3/m2.h enters 3
#Collecting tank, as recycle-water C, its concentration of suspension is less than 30mg/l, the paper pushing board production line, the mud that anaerobic reactor produces send the anaerobic sludge pond, thereby finishes the closed cycle and the wastewater zero discharge of whole production water.
Technique effect of the present invention:
(1) the present invention can realize the non-wastewater discharge completely of paper-making process from waste paper, and the clear water consumption is reduced to about 2-3 rice
3/ ton paper.Thereby preventing and remedying pollution, having tangible environment and economic benefit aspect the conserve water resource.
Advantages such as (2) anaerobic waste water-aerobic biological treatment process of adopting of the present invention has that operating cost is low, energy savings, sludge treatment are easy.
(3) by the effect of anaerobic and aerobic reactor, volatile fatty acid can easily be removed in anaerobic processes in the waste water system, and clearance is up to 99%.In the Waste Water Treatment, pollutants such as chemical oxygen demand COD, biochemical oxygen demand (BOD) BOD, ss suspended solid and Ca, Mg ion there is good effect of removing.After treatment, the viscosity of water descends, and BOD and SS drop to very low, and clarity improves, and recirculated water is no longer rotten, and rotten slurry problem can not take place, and hardness of water is controlled at certain scope, satisfies the needs of water reuse fully.The present invention can solve the problem that comprises organic acid and salt accumulation cause after closed circulation and the zero-emission the rotten slurry of burn into, product stink, operating condition worsens, the secondary sicker causes pitch trouble, the water hardness rising that the wet end additive consumption increases, the calcium accumulation causes that " anionic trash " causes, equipment scaling, the increase of paper machine broken end effectively.
(4) the present invention is by anaerobic and aerobic technology, and when removing pollutant, the biology of finishing recirculated water is softening.Through biological treatment, anaerobic reactor is removed CaCO
3Speed reach 0.15kg/m
3.d, the softening efficient of aerobic reactor reaches 0.21kg/m
3.d, the CaCO of waste water
3Hardness maintains below the 4.5mmol/L.
(5) treatment process of the present invention, one ton of paper of every production only produces 1.2 kilograms of residue biological sludges, saved the Treatment of Sludge expense greatly, the concentration basin that generally can not need mud to concentrate, the mechanical dewatering equipment that does not also need sludge dewatering, therefore also omitted the dissolving metering of supporting dehydration machine room, dehydrating agent and the flushing pump of dispensing device and filter press, cost obviously reduces.
Description of drawings
Accompanying drawing is a process chart of the present invention.
The specific embodiment
Below content of the present invention is described further:
With reference to shown in Figure 1, the waste water D that board production 10 is produced is a recirculated water, and through the fiber that garden net filtration 1 reclaims in the waste water, as paper making raw material paper pushing board production line 10, garden net mesh is 60 orders, and the waste water after the recycled fiber enters a heavy pond 2 and 1 in proper order
#Collecting tank 3, the flow rate of water are controlled to be paper 30-60 cubic meter per ton, 1
#40-70% water can be used as recycle-water A feedboard production line 10 in the collecting tank 3, and all the other water are sent into anaerobic reactor 4, under following controlled condition, and by the removal of microorganisms organic pollution and produce biological emollescence, load 8-12kgCOD/m
3.d under the condition, the service condition of anaerobic reactor 4 is controlled to be: pH is that 6.8-7.2, sludge concentration 25-30gVSS/L, mud 150-200 in age day, water outlet volatile fatty acid are less than 3mmol/l;
Secondly, Aerobic Pond 5 is sent in the water outlet of anaerobic reactor 4 carried out the aerobe processing, the volumetric loading of Aerobic Pond 5 is 1-2kgCOD/m
3.d, the condition of Aerobic Process for Treatment is: pH is 7.5-8.0, hydraulic detention time 10-16 hour, oxygen content 1-4mg/L, in Aerobic Pond 5, adopt Gas feeding low pressure stream aerator, water after the Aerobic Process for Treatment flows into second pond 6, second pond 6 carries out mud-water separation, surface loading is 1.0-1.2m3/m2.h, bottom mud is sent anaerobic reactor 4 back to, the sludge quantity of sending anaerobic reactor 4 back to is the one thousandth of papermaking output, and the top clear water is to have removed organic matter and softening recirculated water, chemical oxygen demand COD＜100mg/l, biochemical oxygen demand (BOD) BOD＜30mg/l, they enter 2
#Collecting tank 7, wherein 50-60% is back to board production 10 as recycle-water B, and remainder is through rapid filter 8, and rate of filtration 7-8m3/m2.h enters 3
#Collecting tank 9, as recycle-water C, its concentration of suspension is less than 30mg/l, paper pushing board production line 10, the mud that anaerobic reactor 4 produces send anaerobic sludge pond 11, thereby finishes the closed cycle and the wastewater zero discharge of whole production water.
In wastewater zero discharge, the production of paper per ton also will replenish about 2-3 ton clear water, the moisture loss that forms in order to links such as the aeration of the evaporation process of balance paper dryer, wastewater treatment and paper screenings.
The reuse of recirculated water is adopted the segmentation grading recycle according to the water quality requirement in this technology, and on the basis of reducing water consumption, the wastewater flow rate that enters water treatment system reduces, the concentration of waste water increases.Adopt the anaerobism+aerobic treatment process of low mud, only produce a small amount of mud, in addition can the long period spoil disposal not.The anaerobic sludge that anaerobic reactor produces, annual discharging is two to four times under the normal condition, so the sludge treatment system is greatly simplified, cost reduces greatly.Anaerobic sludge can be used as the seed sludge of other reactor, also can be used as senior fertilizer.Owing to have only a spot of residual organic substances to enter Aerobic Process for Treatment, the surplus sludge volume that Aerobic Pond produces also seldom in addition.In this technology, these a spot of aerobic excess sludges also will enter further digestion in the anaerobic reactor, and total surplus sludge volume that 1 ton of paper of final every production obtains has only 1.5 kilograms (over dry), and its character changes the anaerobic sludge of stabilisation into.Simplify operation and cost of investment so greatly, also simplified operation.
The processing of recirculated water is divided into one, two, three again, so that satisfy the reuse requirements in water quality of different quality requirement, realizes minimum cost of water treatment simultaneously.It is primary treatment that one-level is handled, and mainly realizes Separation of Solid and Liquid, can finish by a heavy pond, and the recirculated water part reuse after the recycled fiber, part enters two stage treatment (i.e. biological treatment).
Two stage treatment is the core of circulating water treatment, and it is made up of the anaerobic-aerobic bioreactor, and its function is to remove a large amount of organic pollutions and realize that the biology of water is softening.Here, waste water is successively by the anaerobic and aerobic bioreactor, under action of microorganisms, most pollutant (comprise the VFA that causes rotten slurry and stink, to disadvantageous anionic trash of paper-making process and sicker) is broken down into harmless objects such as water, carbon dioxide, for example volatile fatty acid (VFA) can be removed more than 99%, and biochemical oxygen demand (BOD) (BOD) can be removed more than 97%.Anaerobic Treatment produces a large amount of CO
2, CO in the water
2Be in hypersaturated state, thereby with water in Ca
+ 2Ionization produces CaCO
3Precipitation, hardness of water descends, and has therefore solved the Ca of recirculated water
+ 2The ion accumulation problem.CaCO
3Precipitate in the Aerobic Process for Treatment after part occurs in anaerobism, the aeration effect makes CO
2Gas is carried and being removed, and the rising of pH makes partial C aCO again
3Precipitation takes place.CaCO
3Removal amount and raw material in CaCO
3Content is relevant, and after biological treatment system was handled, the concentration of general recirculated water was at 4-5mmol CaCO
3/ l.Circulating water quality through biological treatment has satisfied most industrial water requirements.
Some enters tertiary treatment system (being deep level of processing) recirculated water of process two stage treatment, so that obtain the very high water outlet of clarity, satisfies the highest industrial water requirement of water quality requirement, the requirement of for example felt washing, vavuum pump water seal etc.
Claims (1)
1, anaerobic-aerobic is handled and is realized the waste paper making wastewater Zero-discharge treating process, it is characterized in that, carries out according to the following steps:
At first, the waste water D that board production (10) is produced is a recirculated water, fiber in garden net filtration (1) recovery waste water, as paper making raw material paper pushing board production line (10), garden net mesh is 60 orders, waste water after the recycled fiber enters a heavy pond (2) and a 1# collecting tank (3) in proper order, the flow rate of water is controlled to be paper 30-60 cubic meter per ton, 40-70% water can be used as recycle-water A feedboard production line (10) in the 1# collecting tank (3), all the other water are sent into anaerobic reactor (4), under following controlled condition, by the removal of microorganisms organic pollution and produce biological emollescence: load 8-12kgCOD/m
3.d under the condition, it is that 6.8-7.2, sludge concentration 25-30gVSS/L, mud 150-200 in age day, water outlet volatile fatty acid are less than 3mmol/l that the service condition of anaerobic reactor (4) is controlled to be pH;
Secondly, Aerobic Pond (5) is sent in the water outlet of anaerobic reactor (4) carried out the aerobe processing, the volumetric loading of Aerobic Pond (5) is 1-2kgCOD/m
3.d, the condition of Aerobic Process for Treatment is: pH is 7.5-8.0, hydraulic detention time 10-16 hour, oxygen content 1-4mg/L, in Aerobic Pond (5), adopt Gas feeding low pressure stream aerator, water after the Aerobic Process for Treatment flows into second pond (6), second pond (6) carries out mud-water separation, surface loading is 1.0-1.2m3/m2.h, bottom mud is sent anaerobic reactor (4) back to, the sludge quantity of sending anaerobic reactor (4) back to is the one thousandth of papermaking output, the top clear water is to have removed organic matter and softening recirculated water, chemical oxygen demand COD＜100mg/l, biochemical oxygen demand (BOD) BOD＜30mg/l, they enter 2# collecting tank (7), wherein 50-60% is back to board production (10) as recycle-water B, remainder is through rapid filter (8), rate of filtration 7-8m3/m2.h, enter 3# collecting tank (9), as recycle-water C, its concentration of suspension is less than 30mg/l, paper pushing board production line (10), the mud that anaerobic reactor (4) produces send anaerobic sludge pond (11), thereby finishes the closed cycle and the wastewater zero discharge of whole production water.
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| CN100484891C (en) * | 2006-11-28 | 2009-05-06 | 厦门大学 | Integrative anaerobic-aerobic circulation biological method for treating organic wastewater |
| CN100534932C (en) * | 2006-08-18 | 2009-09-02 | 宜宾长毅浆粕有限责任公司 | Synthetic treating process for pulp waste water |
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| CN106946418A (en) * | 2017-05-15 | 2017-07-14 | 浙江荣晟环保纸业股份有限公司 | The pulping wastewater treatment and method of comprehensive utilization of a kind of low emission |
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| DE4042224A1 (en) * | 1990-12-29 | 1992-07-02 | Pwa Industriepapier Gmbh | METHOD FOR LEADING AND TREATING THE PRODUCTION WATER IN A PAPER FACTORY WITH WASTE PAPER TREATMENT PLANT |
| AUPM452794A0 (en) * | 1994-03-17 | 1994-04-14 | Amcor Limited | Waste water recovery system |
| NL1013491C2 (en) * | 1999-11-04 | 2001-05-07 | Paques Water Systems B V | Recycled paper industry. |
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| CN100484891C (en) * | 2006-11-28 | 2009-05-06 | 厦门大学 | Integrative anaerobic-aerobic circulation biological method for treating organic wastewater |
| CN101708916B (en) * | 2009-09-14 | 2012-06-27 | 陕西科技大学 | Closed circulation and zero emission processes for papermaking wastewater |
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| CN105174605A (en) * | 2015-07-21 | 2015-12-23 | 阿尔诺维根斯(衢州)特种纸有限公司 | Ecological recycling device for treating paper machine sewage and coating sewage |
| CN105174605B (en) * | 2015-07-21 | 2017-06-30 | 阿尔诺维根斯(衢州)特种纸有限公司 | A kind of paper machine sewage and coating sewage treatment ecological recycling device |
| CN105369666A (en) * | 2015-10-13 | 2016-03-02 | 新疆国力源投资有限公司 | White water processing technology of papermaking machine |
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| CN106946418A (en) * | 2017-05-15 | 2017-07-14 | 浙江荣晟环保纸业股份有限公司 | The pulping wastewater treatment and method of comprehensive utilization of a kind of low emission |
| CN110642382A (en) * | 2019-11-07 | 2020-01-03 | 山东环发科技开发有限公司 | Anaerobic and aerobic composite biological treatment desalting method |
| CN110963646A (en) * | 2019-12-16 | 2020-04-07 | 彭吉成 | Method for recycling pulping and papermaking sewage |
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