CN104743750A - Method for treating pulp papermaking industrial wastewater - Google Patents
Method for treating pulp papermaking industrial wastewater Download PDFInfo
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- CN104743750A CN104743750A CN201510143907.8A CN201510143907A CN104743750A CN 104743750 A CN104743750 A CN 104743750A CN 201510143907 A CN201510143907 A CN 201510143907A CN 104743750 A CN104743750 A CN 104743750A
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Abstract
The invention discloses a method for treating pulp papermaking industrial wastewater. The method comprises the following technical steps: (1) removing big impurities of the pulp papermaking industrial wastewater through a grid, putting into an adjusting tank to effectively adjust the water volume and water quality; (2) pumping to a lamella precipitation tank to preprocess, and adding a composite flocculant to guarantee the effective removing effect in the stage in order to remove the insoluble COD and SS in the wastewater; (3) performing biochemical treatment on the wastewater in an aerobiotic tank, separating the sludge and the water of the effluent in a secondary sedimentation tank to reach the wastewater discharge standard; refluxing one part of the sludge of the secondary sedimentation tank to the aerobiotic tank and discharging one part to the sludge tank; and (4) integrally performing sludge filter pressing and dewatering on the sludge generated in each stage and outward transporting to landfill or burn and reflowing the filtered wastewater to the adjusting tank.
Description
Technical field
The present invention relates to pulp and paper industry technical field of waste water processing, particularly relate to a kind for the treatment of process of pulp and paper industry waste water.
Background technology
Paper industry is produced and is divided into two main technique stages, i.e. slurrying and copy paper.Slurrying is the fiber separation in plant material out, makes slurry, then through bleaching; Copy paper be then pulp dilution, shaping, squeeze, dry, make paper.These two techniques all consume a large amount of water.In China, producing 1 ton of paper about needs 100 tons, water (wood pulp) to 400 tons (straw pulps), and wherein major part is discharged as waste water.Dense containing BOD (biochemical oxygen demand (BOD)) and SS (suspended substance) in paper waste, and containing a large amount of pharmaceutical chemicals and impurity.
The waste water that slurrying produces, pollutes the most serious.Discharging waste water during pulp washing is chocolate, is called black liquor.Often produce 1 ton of paper pulp, discharge the black liquor about 10 tons of 10 degree Beaume (10 ° of Be ').Pollutant levels in black liquor are very high, and BOD is up to 5000 ~ 40000 mg/litre, and fiber total amount is sometimes up to product population more than 15%.Also containing a large amount of inorganic salt and pigment.Also containing materials such as acid, alkali in the waste water that bleaching process is discharged.In copy paper technique, the waste water that paper machine front end is discharged, is called plain boiled water, wherein containing a large amount of fiber and the filler added in process of production and sizing material, is useful matter mostly.Black liquor and plain boiled water are the main waste water of paper industry.
At present, according to the feature of pulp and paper industry waste water, general treatment process is: waste water removes in waste water thick floating matter by grid maker through grid in grating tank, waste water enters equalizing tank afterwards, on the one hand because the flow of waste water has malconformation in time, in order to ensure follow-up water treatment system steady running, need equalizing tank be set, balanced water quantity and quality.There is the function of fine particle in precipitation waste water simultaneously; Medicament can be added at this on the one hand in addition and regulate pH, process under the condition of neutrality to make subsequent disposal.Because in the technological process of paper waste, SS comparision contents is high, so the method for consideration coagulating sedimentation removes SS, simultaneously by the method for coagulating sedimentation, BOD and COD in sewage also has very large clearance, so be a very important ring for this technique; Again because the biodegradability of this waste water can be relatively good comparatively speaking, biological easily degraded, but still there is a lot of non-differentiability biodegradable, the day process water yield is larger, consider to adopt biodegradable cost from the angle of economical rationality lower, effect might as well, therefore the process of this waste water adopts the activated sludge process of current application the most widely in Aerobic biological process method.This method is the waste water passed into continuously by air in aeration tank, after after a while, namely the flocs unit (active sludge) with a large amount of aerobic microbiological can be produced among waste water, and adsorb organic pollution materials and participate in metabolism, these aerobic microbiologicals are constantly multiplied using organic pollution materials as foodstuff.Meanwhile, organic pollution materials is decomposed.The active sludge produced is after precipitate and separate, and part is as planting mud, and be back to aeration tank and participate in biodegradable circulation, partial discharge process, the water outlet of clarification can reuse or discharge.Activated sludge process is also one of most widely used method in pulp and paper industry wastewater treatment, has the advantages that BOD clearance is high, low-molecular-weight organic compound of can effectively degrading, but poor for the treatment effect of COD and colourity.Therefore, activated sludge process is usually combined with coagulating sedimentation, to improve the clearance of COD and to reduce the colourity of waste water.
In above-mentioned technical process, adding flocculation agent is very crucial step; But current low molecule flocculation agent is as the aluminium such as Tai-Ace S 150, aluminum chloride salt system and the molysite such as iron(ic) chloride and ferric sulfate system, the shortcomings such as flocculating effect is poor, medicine consumption is high; And polymeric flocculant is as aluminum chloride hydrocarbon complex (PAC), polyaluminium sulfate, bodied ferric sulfate etc., overcome the low shortcoming of processing efficiency that low molecule flocculation agent exists, but the problem such as its cost is higher.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is to provide a kind of pulp and paper industry method of wastewater treatment.The present invention by adding the flocculating agent composition of special preparation in treatment process, and during pulp and paper industry waste water, not only amount of consumption of drugs is few, flocculating effect is good, and possess efficient CODcr removal function.
For achieving the above object, this invention takes following technical scheme:
A kind of pulp and paper industry method of wastewater treatment, comprises following technological step:
(1) pulp and paper industry waste water is removed after larger impurity through grid, enters equalizing tank, carries out effective adjustment of water quantity and quality;
(2) then entering inclined-plate clarifying basin with pump lifting and carry out pre-treatment, in this stage, in order to remove insoluble COD and SS in waste water, adding composite flocculation agent to ensure effective removal effect; After composite flocculation agent adds waste water, mix standing 35 ~ 45min, composite flocculant dosage is 30 ~ 50mg/L waste water;
(3) waste water after enters Aerobic Pond and carries out biochemical treatment, and water outlet enters second pond and carries out mud-water separation, discharge of wastewater up to standard; Before the mud part of second pond is back to Aerobic Pond, a part drains into sludge sump;
(4) mud of each stage generation just can be transported to outward landfill or burning after concentrating and carrying out sludge press filtration dehydration; Waste water after press filtration is back to equalizing tank again.
In technique scheme, described composite flocculant, with parts by weight, composed of the following components:
Graphite Powder 99: 30 ~ 50, iron powder: 10 ~ 20, zinc powder: 1 ~ 5,
Diatomite: 1 ~ 5, ferric sulfate: 1 ~ 2, Tai-Ace S 150: 10 ~ 15,
Flyash: 1 ~ 5, ferric metasilicate: 10 ~ 20, ammonium persulphate 2 ~ 8.
Described composite flocculant preparation technology is: by proportioning, after the mixing of each component, dispersed with stirring evenly after finished product.
Composite flocculant of the present invention can be used for the Industrial Wastewater Treatment of high organic pollutant CODcr and high suspended matter SS, and controlling throwing amount is 30 ~ 50mg/L waste water.
Principle of the present invention is: when iron powder and Graphite Powder 99 to be immersed in pulp and paper industry waste water in leading portion, due to the difference in Electrode Potential between iron and Graphite Powder 99, can form numerous micro-galvanic cell in waste water.These trickle batteries become anode with the iron that current potential is low, and the carbon that current potential is high does negative electrode, in containing the aqueous solution of acidic electrolyte bath, electrochemical reaction occurs.The result of reaction is that iron is corroded the iron ion becoming divalence and enters solution.Because iron ion has coagulation, there is a natural attraction between the sexes for particulate with faint negative charge in it and pollutent, forms more stable throw out (being also iron mud) and remove, in order to increase potential difference, promote the release of iron ion, in iron-graphite bed, add certain proportion copper powder.The iron that wherein current potential is low becomes anode, and the carbon that current potential is high becomes negative electrode, in acid condition electrochemical reaction occurs, and its reaction process is as follows:
Anode (Fe): Fe-2e → Fe2+,
Negative electrode (C): 2H++2e → 2 [H] → H2,
In reaction, the Fe2+ of the status nascendi of generation and atom H, they have high chemically reactive, can change many organic structure and characteristics in waste water, make the effects such as organism generation chain rupture, open loop.
The OH generated in reaction
-it is the reason that water outlet pH value raises, and the Fe3+ generated by Fe2+ oxidation is hydrolyzed large Fe (OH) the 3 colloid flocculation agent of the generation polymerization degree gradually, ferric-polysilicate simultaneously in composite flocculant effectively can promote the pollutent in absorption, cohesion water, thus strengthens the decontamination effect improving to trade effluent.
Compared with prior art, the present invention has following beneficial effect:
The present invention adds the composite flocculation agent of special preparation in waste water treatment process, and the feature of this composite flocculation agent is: not only iron powder and Graphite Powder 99 can form countless light electrolysis, and the product Fe after reaction generation
2+and Fe
3+itself be also a kind of good flocculation agent, play well to flocculate acting synergistically with ferric-polysilicate, reach the dual removal of high organic pollutant CODcr and high suspended matter SS; Thus pulp and paper industry waste water is processed effectively.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
Embodiment 1
A kind of pulp and paper industry method of wastewater treatment, comprises following technological step:
(1) pulp and paper industry waste water is removed after larger impurity through grid, enters equalizing tank, carries out effective adjustment of water quantity and quality;
(2) then entering inclined-plate clarifying basin with pump lifting and carry out pre-treatment, in this stage, in order to remove insoluble COD and SS in waste water, adding composite flocculation agent to ensure effective removal effect; After composite flocculation agent adds waste water, mix standing 35 ~ 45min, composite flocculant dosage is 30 ~ 50mg/L waste water;
(3) waste water after enters Aerobic Pond and carries out biochemical treatment, and water outlet enters second pond and carries out mud-water separation, discharge of wastewater up to standard; Before the mud part of second pond is back to Aerobic Pond, a part drains into sludge sump;
(4) mud of each stage generation just can be transported to outward landfill or burning after concentrating and carrying out sludge press filtration dehydration; Waste water after press filtration is back to equalizing tank again.
In technique scheme, described composite flocculant, with parts by weight, composed of the following components:
Graphite Powder 99: 30, iron powder: 10, zinc powder: 1,
Diatomite: 1, ferric sulfate: 1, Tai-Ace S 150: 10,
Flyash: 1, ferric metasilicate: 10, ammonium persulphate 2.
Added in proportion by above-mentioned composite flocculant in pulp and paper industry waste water in leading portion, mix standing 35 ~ 45min, composite flocculant dosage is 30 ~ 50mg/L.
Get above-mentioned reacted clear liquid and carry out chemical oxygen demand COD cr and ss suspended solid mensuration, obtain following result: CODcr clearance is greater than 95%, SS clearance and is greater than 85%.
Embodiment 2
The wastewater treatment operation of the present embodiment with embodiment 1, the composite flocculant that the present embodiment uses, with parts by weight, composed of the following components:
Graphite Powder 99: 40, iron powder: 15, zinc powder: 3,
Diatomite: 3, ferric sulfate: 1.5, Tai-Ace S 150: 13,
Flyash: 3, ferric metasilicate: 15, ammonium persulphate 5.
Added in proportion by above-mentioned composite flocculant in pulp and paper industry waste water in leading portion, mix standing 35 ~ 45min, composite flocculant dosage is 30 ~ 50mg/L waste water.
Get above-mentioned reacted clear liquid and carry out chemical oxygen demand COD cr and ss suspended solid mensuration, obtain following result: CODcr clearance is greater than 90%, SS clearance and is greater than 90%.
Embodiment 3
The wastewater treatment operation of the present embodiment with embodiment 1, the composite flocculant that the present embodiment uses, with parts by weight, composed of the following components:
Graphite Powder 99: 50, iron powder: 20, zinc powder: 5,
Diatomite: 5, ferric sulfate: 1, Tai-Ace S 150: 15,
Flyash: 5, ferric metasilicate: 20, ammonium persulphate 8.
Added in proportion by above-mentioned composite flocculant in pulp and paper industry waste water in leading portion, mix standing 35 ~ 45min, composite flocculant dosage is 30 ~ 50mg/L waste water.
Get above-mentioned reacted clear liquid and carry out chemical oxygen demand COD cr and ss suspended solid mensuration, obtain following result: CODcr clearance is greater than 85%, SS clearance and is greater than 95%.
In above-described embodiment, described composite flocculant preparation technology is: by proportioning, after the mixing of each component, dispersed with stirring evenly after finished product.
Common commercially available prod is all for the preparation of the raw material of composite flocculation agent in above-described embodiment.
Claims (2)
1. a pulp and paper industry method of wastewater treatment, is characterized in that, comprises following technological step:
(1) pulp and paper industry waste water is removed after larger impurity through grid, enters equalizing tank, carries out effective adjustment of water quantity and quality;
(2) then entering inclined-plate clarifying basin with pump lifting and carry out pre-treatment, in this stage, in order to remove insoluble COD and SS in waste water, adding composite flocculation agent to ensure effective removal effect; After composite flocculation agent adds waste water, mix standing 35 ~ 45min, composite flocculant dosage is 30 ~ 50mg/L waste water;
(3) waste water after enters Aerobic Pond and carries out biochemical treatment, and water outlet enters second pond and carries out mud-water separation, discharge of wastewater up to standard; Before the mud part of second pond is back to Aerobic Pond, a part drains into sludge sump;
(4) mud of each stage generation just can be transported to outward landfill or burning after concentrating and carrying out sludge press filtration dehydration; Waste water after press filtration is back to equalizing tank again.
2. a kind of pulp and paper industry method of wastewater treatment according to claim 1, is characterized in that, described composite flocculant, with parts by weight, composed of the following components:
Graphite Powder 99: 30 ~ 50, iron powder: 10 ~ 20, zinc powder: 1 ~ 5,
Diatomite: 1 ~ 5, ferric sulfate: 1 ~ 2, Tai-Ace S 150: 10 ~ 15,
Flyash: 1 ~ 5, ferric metasilicate: 10 ~ 20, ammonium persulphate 2 ~ 8.
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| CN201510143907.8A CN104743750B (en) | 2015-03-30 | 2015-03-30 | Method for treating pulp papermaking industrial wastewater |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186236A (en) * | 2016-08-28 | 2016-12-07 | 临沂润达水务有限公司 | A kind of containing ferric chloride, the sewage-treating agent of iron sulfate |
| CN106365391A (en) * | 2016-11-15 | 2017-02-01 | 佛山迅拓奥科技有限公司 | Method for treating alcohol wastewater |
| CN106477818A (en) * | 2016-11-15 | 2017-03-08 | 佛山迅拓奥科技有限公司 | A kind of processing method of food wastewater |
| CN106477819A (en) * | 2016-11-15 | 2017-03-08 | 佛山迅拓奥科技有限公司 | A kind of processing method of beer waste water |
| CN108083500A (en) * | 2017-12-26 | 2018-05-29 | 重庆丰望环保科技有限公司 | A kind of papermaking wastewater flocculation sediment processing system and flocculant |
| CN114956456A (en) * | 2022-05-25 | 2022-08-30 | 湖北华海纤维科技股份有限公司 | Method for treating pulping wastewater by using microorganisms and flocculating agent |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1609022A (en) * | 2003-10-24 | 2005-04-27 | 杨素叶 | Papermaking effluent treating method |
| CN102372401A (en) * | 2011-09-28 | 2012-03-14 | 同济大学 | Iron-carbon micro-electrolysis-dynamic membrane wastewater deep treatment process |
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2015
- 2015-03-30 CN CN201510143907.8A patent/CN104743750B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1609022A (en) * | 2003-10-24 | 2005-04-27 | 杨素叶 | Papermaking effluent treating method |
| CN102372401A (en) * | 2011-09-28 | 2012-03-14 | 同济大学 | Iron-carbon micro-electrolysis-dynamic membrane wastewater deep treatment process |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106186236A (en) * | 2016-08-28 | 2016-12-07 | 临沂润达水务有限公司 | A kind of containing ferric chloride, the sewage-treating agent of iron sulfate |
| CN106365391A (en) * | 2016-11-15 | 2017-02-01 | 佛山迅拓奥科技有限公司 | Method for treating alcohol wastewater |
| CN106477818A (en) * | 2016-11-15 | 2017-03-08 | 佛山迅拓奥科技有限公司 | A kind of processing method of food wastewater |
| CN106477819A (en) * | 2016-11-15 | 2017-03-08 | 佛山迅拓奥科技有限公司 | A kind of processing method of beer waste water |
| CN108083500A (en) * | 2017-12-26 | 2018-05-29 | 重庆丰望环保科技有限公司 | A kind of papermaking wastewater flocculation sediment processing system and flocculant |
| CN108083500B (en) * | 2017-12-26 | 2023-12-19 | 重庆丰望环保科技有限公司 | Papermaking sewage flocculation and precipitation treatment system and flocculant |
| CN114956456A (en) * | 2022-05-25 | 2022-08-30 | 湖北华海纤维科技股份有限公司 | Method for treating pulping wastewater by using microorganisms and flocculating agent |
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Inventor after: Li Guilin Inventor before: Qian Mingjiang |
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Effective date of registration: 20161008 Address after: Chenghai District of Guangdong city of Shantou Province on the 515833 lotus Lianmaolu middle Town Industrial Zone Applicant after: Shantou Guanghua Paper Making Co., Ltd. Address before: 313000 Wuxing District, Huzhou City, the town of the village of the town of the village should be the 2 bay Bay, the building of the eight Applicant before: HUZHOU HUADING TRADE CO., LTD. |
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