CN101723495A - Process of zero discharge of paper-making waste water - Google Patents

Process of zero discharge of paper-making waste water Download PDF

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Publication number
CN101723495A
CN101723495A CN200810171975A CN200810171975A CN101723495A CN 101723495 A CN101723495 A CN 101723495A CN 200810171975 A CN200810171975 A CN 200810171975A CN 200810171975 A CN200810171975 A CN 200810171975A CN 101723495 A CN101723495 A CN 101723495A
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China
Prior art keywords
water
paper
enters
pulp
plain boiled
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CN200810171975A
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Chinese (zh)
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CN101723495B (en
Inventor
甘木林
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JINJIANG YOULANFA PAPER INDUSTRY Co Ltd
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JINJIANG YOULANFA PAPER INDUSTRY Co Ltd
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Publication of CN101723495A publication Critical patent/CN101723495A/en
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Abstract

The invention relates to a treatment process of paper-making waste water. A waste water short recycling system is implemented in a workshop. The process of the invention comprises the following steps: (1) pulp enters a pulp mixing tank of a paper machine through a pulp pump and then reaches the paper machine; (2) the pulp is divided into two paths after passing through the paper machine; (3) thick white water below a screen enters a thick white water collecting tank to be recycled; and (4) thin white water below the screen enters a thin white water collecting tank to be pumped into a white water recoverer by a variable-frequency pump. After the white water and medicines are uniformly mixed, the mixture flows into a distribution reservoir, and the supernatant clear water is recycled for production after being filtered by a valveless filter; bottom sludge and valveless filter buffering water are pumped into a radial flow sedimentation tank by a pump, the supernatant liquid enters the valveless filter to be filtered, and the filtered clear water is recycled for production; and the filter residues obtained after filtering are prepared into filter cakes by using a belt press filter, and the filter cakes are used for production in packing paper workshops, thereby realizing zero discharge of the waste water.

Description

Paper making wastewater zero discharge technique
[technical field]
The present invention relates to a kind of technological process for the treatment of papermaking technology.
[background technology]
Paper industry is big, the heavy-polluted industry of water consumption, and it is about 25% that the organism (being COD) of paper waste discharging accounts for China's trade effluent total amount of organic, severe contamination environment.Therefore, paper making wastewater zero discharge is the production practical technique that a water saving and pollution treatment are laid equal stress on, and has favorable economic benefit, also has obvious social and environmental benefit, also is the necessary choice that paper industry is realized Sustainable development.
In the present domestic paper mill, also there is not the paper mill really to reach zero release.Be generally 5% discharging, what their adopted is the waste water second-stage treatment, and earlier in the workshop internal recycling, unnecessary water advances the workshop retention basin, uses pump suction coagulative precipitation tank then, the dosing precipitation process.Ton paper water loss is about 15 cubic metres at present, and working cost is relatively low, but still has portion water regularly to discharge.Abroad successful is the pyroprocessing waste water zero-discharge technology that finish jointly in German water treatment company and two tame paper mills, the core is that high temperature anaerobic is handled, and effect is better, at present the about 5-6 cubic meter of the paper grade (stock) water yield, but the cost of investment height is applicable to the enterprise that papermaking is larger.
[summary of the invention]
The objective of the invention is to overcome the defective of prior art, a kind of paper-making effluent treating process that is suitable for middle-size and small-size scale is provided, really realize the mthod of white water from paper making zero release.
The present invention realizes by following technical solution.
Internal implementation waste water weak point recycles system in the workshop, and technological line is as follows:
(1) paper pulp enters the paper machine by pulp pump and joins stock tank, arrives the paper machine then;
(2) paper pulp is divided into two strands after by the paper machine, is respectively enriched water off the net and rare plain boiled water off the net;
(3) enriched water off the net enters the enriched water collecting tank, recycles;
(4) rare plain boiled water off the net enters rare plain boiled water collecting tank, adopts variable frequency pump suction white water recycle device;
By recycling system at workshop internal implementation waste water weak point, rare enriched water is separated, enriched water separates, enriched water is fully recovering as far as possible, be used for the pulpboard size degradation and join the slurry use, unnecessary enriched water and rare plain boiled water enter internal gathering pond, workshop, adopt variable frequency pump suction white water recycle device.
The white water recycle device mainly acts on and makes plain boiled water accelerate precipitation, layering.A Buffer Pool is set on the white water recycle device.Plain boiled water is after tangential direction enters and behind the medicine uniform mixing, and through the pulse action by bell jar in the Buffer Pool, plain boiled water regularly flows into white water recycle device center distribution reservoir.The bell jar pulse is meant by the suction function in the bell jar, regularly produces syphonic effect, makes plain boiled water enter the center distribution reservoir at regular time and quantity.When plain boiled water liquid level in the Buffer Pool arrived the bell jar central nozzle, bell jar produced negative pressure, made the interior plain boiled water of Buffer Pool all enter the center distribution reservoir.Because of entering the interior white water pump of Buffer Pool is to adopt variable frequency control, stability of flow, and the time that arrives bell jar generation negative pressure also is certain.Distribution reservoir is cylindrical, evenly opens several circular holes on it, and some arms that distribute are opened several circular holes on each arm, and purpose is to make plain boiled water stablize flow velocity, uniform distribution, accelerate precipitation.The upper strata clear water is back to production after valveless filtering pool filters.Bottom mud and valveless filtering pool buffered water (being valveless filtering pool sewer and part mud after filtering) are pumped into radial-flow sedimentation tank.
Above-mentioned medicine is meant polymerize aluminum chloride and two kinds of chemical of polyacrylamide.Adsorb mutually by the paper pulp fiber in these two kinds of medicines and the plain boiled water, postprecipitation condenses.Polymerize aluminum chloride: polyacrylamide: plain boiled water=4: 1: 1000000 (1,000,000), promptly dose is about 5ppm.
Adopt radial-flow sedimentation tank to precipitate, sewage from settling tank bottom centre upwards, after cushioning evenly to around the diffusion, layering gradually, clear liquid enters valveless filtering pool and filters, it mainly is that sand by the different size size carries out coarse filtration that valveless filtering pool filters, and a large amount of impurity and suspended substance are filtered the back and discharged with buffered water.Clear water after the filtration is back to production, thereby realizes the production zero release.
The filter residue that obtains after the filtration adopts belt filter press to make filter cake, is used for the wrapping paper Workshop Production.At paper machine room three cylinder mould starchings are set, the intermediary cylinder mould is used to hang filter cake, makes tail layer slurry and uses, and starch adhesive and prime cement waste paper are raw material, add starch simultaneously and strengthen, and guarantee paper quality.
The key technical indexes of the present invention:
1, ton 4.2 tons of water consumptions of paper (be process water all, comprise paper moisture and drying cylinder vaporize water etc.).
2, to advance collecting tank amount ton paper be 20 cubic metres to white water recycle device discharge water, about 5 cubic metres of valveless filtering pool buffered water ton paper.
3, after biochemistry pool is handled, water-quality guideline: pH value 6.84COD-40mg/lBOD8mg/lSS-8mg/l
4, reuse water cost per ton is: 0.18 yuan of medicine: 0.05 yuan of labour cost: 0.03 yuan of depreciation funds: 0.07 yuan adds up to cost: 0.33 yuan of/ton water.
5, water generates filter cake 0.08kg per ton discharges 60 subtotals with ton paper, and reuse filter cake ton is about 48kg.Be used for the wrapping paper workshop and make raw material, remarkable in economical benefits.
Technology of the present invention is specially adapted to utilize office to mix with former gloomy slurry with the deinking slurry of waste paper after deinking and produces high-grade true qualities tissue paper, tissue paper at 3: 7, can reach all wastewater zero discharges.
[description of drawings]
Fig. 1 is the basic artwork of the short circulation of waste water.
Fig. 2 is the radial-flow sedimentation tank structural representation.
Fig. 3 is the structure iron of distribution reservoir.
[embodiment]
Further specify the present invention below by a concrete example.
Paper pulp mixes with former gloomy slurry with the deinking slurry of waste paper after deinking for office at 3: 7.With reference to figure 1, it is as follows to recycle system step at inside, workshop waste water weak point:
(1) paper pulp enters the paper machine by pulp pump and joins stock tank, arrives the paper machine then;
(2) paper pulp is divided into two strands after by the paper machine, is respectively enriched water off the net and rare plain boiled water off the net;
(3) enriched water off the net enters the enriched water collecting tank, recycles;
(4) rare plain boiled water off the net enters rare plain boiled water collecting tank, adopts variable frequency pump suction white water recycle device.
The white water recycle device is provided with a Buffer Pool.(concentration 5ppm, polymerize aluminum chloride: polyacrylamide=4: 1) behind the uniform mixing, through the pulse action by bell jar in the Buffer Pool, plain boiled water regularly flows into white water recycle device center distribution reservoir to plain boiled water with medicine after tangential direction enters.With reference to figure 3, uniform 24 diameters are 20 centimetres arm 1 on the distribution reservoir, and water is evenly distributed to these arms, and arrow 2 expression plain boiled waters flow to the direction of arm, 3 expression plain boiled water influxs.Have 72 diameters and be 3.6 centimetres circular hole 4 on each arm, plain boiled water to whole white water recycle device uniform distribution, reaches precipitation, stratified purpose after these circular holes 4 are discharged.The upper strata clear water is back to production after valveless filtering pool filters.Bottom mud and valveless filtering pool buffered water are pumped into radial-flow sedimentation tank.
With reference to figure 2, radial-flow sedimentation tank comprises water-in 1, water outlet 2 and slag-drip opening 3.Sewage from settling tank bottom centre upwards, after cushioning evenly to around diffusion, layering gradually, clear liquid enters valveless filtering pool and filters.Clear water after the filtration is back to production, thereby realizes the production zero release.
The filter residue that obtains after the filtration adopts belt filter press to make filter cake, is used for the wrapping paper Workshop Production.
Ton paper water consumption is 4.2 tons, all is moisture content and drying cylinder portion evaporation moisture content in the paper, does not have discharge water.Water quality after the biochemical treatment: pH value: 6.84 COD:40mg/lBOD:8mg/l SS:8mg/l fully recoverings.

Claims (5)

1. paper-making effluent treating process, internal implementation waste water weak point recycles system in the workshop, and technological line is as follows:
(1) paper pulp enters the paper machine by pulp pump and joins stock tank, arrives the paper machine then;
(2) paper pulp is divided into two strands after by the paper machine, is respectively enriched water off the net and rare plain boiled water off the net;
(3) enriched water off the net enters the enriched water collecting tank, recycles;
(4) rare plain boiled water off the net enters rare plain boiled water collecting tank, adopts variable frequency pump suction white water recycle device;
Described white water recycle device comprises a Buffer Pool, plain boiled water enters the back to be mixed with medicine, flow into white water recycle device center distribution reservoir, the upper strata clear water is back to production after valveless filtering pool filters, bottom mud and valveless filtering pool buffered water are pumped into radial-flow sedimentation tank, clear liquid enters valveless filtering pool and filters, and the clear water after the filtration is back to production;
Wherein said distribution reservoir is cylindrical, evenly opens several circular holes on it, and some arms that distribute are opened several circular holes on each arm,
Above-mentioned medicine is meant polymerize aluminum chloride and two kinds of chemical of polyacrylamide, and polymerize aluminum chloride: polyacrylamide: plain boiled water=4: 1: 1000000 (1,000,000), promptly dose is about 5ppm.
2. paper-making effluent treating process according to claim 1, the filter residue that obtains after wherein filtering adopts belt filter press to make filter cake, is used for the wrapping paper Workshop Production.
3. paper-making effluent treating process according to claim 1, wherein by the pulse action of bell jar in the Buffer Pool, plain boiled water is white water recycle device center distribution reservoir regularly.
4. paper-making effluent treating process according to claim 1, wherein said paper pulp is used to produce tissue paper or tissue paper for office mixes with former gloomy slurry with the deinking slurry of waste paper after deinking at 3: 7.
5. paper-making effluent treating process according to claim 1, uniform 24 diameters are 20 centimetres arm on the wherein said distribution reservoir, have 72 diameters and be 3.6 centimetres circular hole on each arm.
CN2008101719755A 2008-10-28 2008-10-28 Process of zero discharge of paper-making waste water Expired - Fee Related CN101723495B (en)

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CN2008101719755A CN101723495B (en) 2008-10-28 2008-10-28 Process of zero discharge of paper-making waste water

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CN101723495B CN101723495B (en) 2012-06-06

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102167471A (en) * 2011-02-25 2011-08-31 福建省晋江优兰发纸业有限公司 Treatment method of industrial papermaking wastewater
CN103088689A (en) * 2013-01-28 2013-05-08 钟立福 Zero discharging and recycling technology for waste paper or raw stock board papermaking wastewater
CN106007187A (en) * 2016-06-28 2016-10-12 福建省晋江优兰发纸业有限公司 High-end packaging paper production waste water reuse and treatment method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2004060A (en) * 1934-05-24 1935-06-04 Warner Elevator Mfg Company Residence elevator
SE518577C2 (en) * 2000-12-08 2002-10-29 Real Sverige Ab M Process for making paper with constant filler content
CN1185386C (en) * 2003-01-25 2005-01-19 无锡荣成纸业有限公司 Method for preparing kraft cardboard paper

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102167471A (en) * 2011-02-25 2011-08-31 福建省晋江优兰发纸业有限公司 Treatment method of industrial papermaking wastewater
CN103088689A (en) * 2013-01-28 2013-05-08 钟立福 Zero discharging and recycling technology for waste paper or raw stock board papermaking wastewater
CN103088689B (en) * 2013-01-28 2014-10-08 钟立福 Zero discharging and recycling technology for waste paper or raw stock board papermaking wastewater
CN106007187A (en) * 2016-06-28 2016-10-12 福建省晋江优兰发纸业有限公司 High-end packaging paper production waste water reuse and treatment method

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