CN104743750B - Method for treating pulp papermaking industrial wastewater - Google Patents

Method for treating pulp papermaking industrial wastewater Download PDF

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Publication number
CN104743750B
CN104743750B CN201510143907.8A CN201510143907A CN104743750B CN 104743750 B CN104743750 B CN 104743750B CN 201510143907 A CN201510143907 A CN 201510143907A CN 104743750 B CN104743750 B CN 104743750B
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waste water
tank
water
wastewater
sludge
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CN104743750A (en
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李佳林
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Shantou Guanghua Paper Making Co., Ltd.
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Shantou Guanghua Paper Making Co Ltd
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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

A kind of processing method of pulp and paper industry waste water
Technical field
The present invention relates to pulp and paper industry technical field of waste water processing, more particularly, to a kind of paper The processing method of pulp and paper industry waste water.
Background technology
Paper industry produces and is divided into two main technique stages, i.e. slurrying and copy paper.Slurrying is handle Fiber separation in plant material out, makes slurry, then through bleaching;Copy paper is then that slurry is dilute Release, molding, squeezing, dry, make paper.This two techniques all consume substantial amounts of water.? China, producing 1 ton of paper about needs 100 tons of water (wood pulp) to 400 tons (straw pulp), wherein big portion It is allocated as discharging for waste water.BOD (Biochemical oxygen demand) and SS (float) is contained in paper waste Dense, and contain a large amount of chemical drugss and impurity.
The waste water that slurrying produces, pollution is the most serious.Discharging waste water during pulp washing is in pitchy, claims For black liquor.Often produce 1 ton of paper pulp, discharge about 10 tons of the black liquor of 10 Baume degrees (10 ° of Be '). Pollutant levels in black liquor are very high, and BOD is up to 5000~40000 mg/litre, fiber total amount Sometime up to product population more than 15%.Also contain a large amount of inorganic salts and pigment.Bleaching process is arranged Also the materials such as acid, alkali are contained in the waste water going out.In copy paper technique, paper machine front end is discharged Waste water, referred to as plain boiled water, wherein contain a large amount of fibers and the filler adding in process of production and glue Material, is utility mostly.Black liquor and plain boiled water are the main waste water of paper industry.
At present, the feature according to pulp and paper industry waste water, general handling process is:Waste water In grid pond, thick floating thing in waste water is removed by grid maker through grid, waste water enters afterwards Enter regulating reservoir, on the one hand because the flow of waste water has lack of uniformity in time, in order to ensure Follow-up water treatment system stable operation, need to arrange regulating reservoir, equalize water quantity and quality.Have simultaneously The function of fine particle in precipitation waste water;Still further aspect can add medicament to adjust pH with here, So that subsequent treatment is processed under conditions of neutrality.Due in the technical process of paper waste SS comparision contents are high, it is contemplated that removing SS with the method for coagulating sedimentation, passing through coagulation simultaneously and sinking The method formed sediment, BOD and COD in sewage also has very big clearance, so for this technique For be a very important ring;Again because comparatively the biodegradability of this waste water can compare Good, biological degradable, but still there are a lot of non-differentiabilities biodegradable, day processes the water yield relatively Greatly, adopt biodegradable cost relatively low from the point of view of economical rationality, effect, because The process of this this waste water adopts the activity in current application most commonly used Aerobic biological process method Sludge.This method is the waste water being continuously passed through air in Aeration tank, after a while, The floccule body (activated sludge) with a large amount of aerobic microbiologicals can be produced among waste water, and Absorption organic pollution materials participate in metabolism, and these aerobic microbiologicals are made with organic pollution materials Constantly multiply for foodstuff.Meanwhile, organic pollution materials are decomposed.Produced work Property mud after precipitate and separate, partly as planting mud, be back to Aeration tank and participate in biological fall The circulation of solution, partial discharge is processed, and the water outlet of clarification can be with reuse or discharge.Activated sludge Method is also one of most widely used method in pulp and paper industry wastewater treatment, has BOD The high feature of clearance, the organic compound of low-molecular-weight of can effectively degrading, but for The treatment effect of COD and colourity is poor.Therefore, activated sludge process is usually and coagulating sedimentation It is used in combination, to improve the clearance of COD and the colourity reducing waste water.
In above-mentioned technological process, add the step that flocculant is non-the normally off key;But it is current The low molecule flocculant such as iron salt such as the aluminium salt such as aluminum sulfate, aluminum chloride system and iron chloride and iron sulfate System, the shortcomings of flocculating effect is poor, medicine consumption is high;And high polymer coagulant such as alkali formula polyaluminium Aluminum (PAC), polyaluminium sulfate, bodied ferric sulfate etc., overcome the presence of low molecule flocculant The low shortcoming for the treatment of effeciency, but the problems such as it is relatively costly.
Content 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 passes through to add the flocculant combination especially prepared in processing method Thing, during pulp and paper industry waste water, not only amount of consumption of drugs is few, flocculating effect is good, and possesses efficiently CODcr remove function.
For reaching above-mentioned purpose, this invention takes following technical scheme:
A kind of pulp and paper industry method of wastewater treatment, including following technical step:
(1) pulp and paper industry waste water removes after larger impurity through grid, enters regulating reservoir, Carry out effective regulation of water quantity and quality;
(2) and then with pump it is lifted into inclined-plate clarifying basin and carries out pretreatment, in this stage, be Insoluble COD and SS in removing waste water, adds composite flocculation agent ensureing effectively to go Except effect;After composite flocculation agent adds waste water, mix homogeneously stands 35~45min, compound Flocculant dosage is 30~50mg/L waste water;
(3) waste water after enters to be advanced into Aerobic Pond and carries out biochemical treatment, and water outlet enters two and sinks Pond carries out mud-water separation, discharge of wastewater up to standard;A mud part for second pond is back to aerobic Chi Qian, a part drains into sludge-tank;
(4) mud that each stage produces can be to transport outward after concentrating and carrying out sludge press filtration dehydration To landfill or burning;Waste water after filter pressing is back to regulating reservoir again.
In technique scheme, described composite flocculant, in parts by weight, by with the following group It is grouped into:
Graphite powder:30~50, iron powder:10~20, zinc powder:1~5,
Kieselguhr:1~5, iron sulfate:1~2, aluminum sulfate:10~15,
Flyash:1~5, ferrosilite:10~20, Ammonium persulfate. 2~8.
Described composite flocculant preparation technology is:By proportioning, after each component is mixed, stir Mix after being uniformly dispersed to obtain finished product.
The composite flocculant of the present invention can be used for high organic pollution CODcr and high suspended matter The Industrial Wastewater Treatment of SS, control throwing amount is 30~50mg/L waste water.
The principle of the present invention is:Iron powder and graphite powder are immersed in pulp and paper industry waste water When in leading portion, due to the difference in Electrode Potential between ferrum and graphite powder, can be formed numerous in waste water Micro- galvanic element.These trickle batteries are to become anode with the low ferrum of current potential, and the high carbon of current potential does the moon , there is electrochemical reaction in the aqueous solution containing acidic electrolyte bath in pole.The result of reaction is ferrum It is subject to the iron ion that corrosion becomes bivalence to enter solution.Because iron ion has coagulation, it with In pollutant, there is a natural attraction between the sexes for the microgranule with faint negative charge, the more stable flocculate of formation ( It is iron cement) and remove, in order to increase potential difference, promote the release of iron ion, in iron-graphite bed Middle addition certain proportion copper powder.The wherein low ferrum of current potential becomes anode, and the high carbon of current potential becomes cloudy , there is electrochemical reaction in pole, its course of reaction as follows in acid condition:
Anode (Fe):Fe-2e→Fe2+,
Negative electrode (C):2H++2e→2[H]→H2,
In reaction, the Fe2+ of nascent state and atom H of generation, they have high chemism, The structure of many Organic substances and characteristic in waste water can be changed, make Organic substance that chain rupture, open loop etc. to occur Effect.
The OH generating in reaction-It is the reason water outlet pH value raises, and aoxidized by Fe2+ and generate Fe3+ gradually hydrolyze and generate big Fe (OH) the 3 colloid flocculant of the degree of polymerization, compound wadding simultaneously Ferric-polysilicate in solidifying agent can be effectively promoted absorption, the pollutant condensing in water, thus increasing The strong clean-up effect to industrial wastewater.
Compared with prior art, the present invention has the advantages that:
The present invention adds the composite flocculation agent of special preparation in waste water treatment process, this compound wadding The feature of solidifying agent is:Not only iron powder and graphite powder can form countless light electrolysis, and react Product Fe after generation2+And Fe3+Itself it is also a kind of good flocculant, rise with ferric-polysilicate To good flocculation synergism, reach high organic pollution CODcr's and high suspended matter SS Dual removal;So that pulp and paper industry waste water is efficiently treated.
Specific 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, including following technical step:
(1) pulp and paper industry waste water removes after larger impurity through grid, enters regulating reservoir, Carry out effective regulation of water quantity and quality;
(2) and then with pump it is lifted into inclined-plate clarifying basin and carries out pretreatment, in this stage, be Insoluble COD and SS in removing waste water, adds composite flocculation agent ensureing effectively to go Except effect;After composite flocculation agent adds waste water, mix homogeneously stands 35~45min, compound Flocculant dosage is 30~50mg/L waste water;
(3) waste water after enters to be advanced into Aerobic Pond and carries out biochemical treatment, and water outlet enters two and sinks Pond carries out mud-water separation, discharge of wastewater up to standard;A mud part for second pond is back to aerobic Chi Qian, a part drains into sludge-tank;
(4) mud that each stage produces can be to transport outward after concentrating and carrying out sludge press filtration dehydration To landfill or burning;Waste water after filter pressing is back to regulating reservoir again.
In technique scheme, described composite flocculant, in parts by weight, by with the following group It is grouped into:
Graphite powder:30, iron powder:10, zinc powder:1,
Kieselguhr:1, iron sulfate:1, aluminum sulfate:10,
Flyash:1, ferrosilite:10, Ammonium persulfate. 2.
Above-mentioned composite flocculant is added in leading portion in pulp and paper industry waste water in proportion, mixes Close and uniformly stand 35~45min, composite flocculant dosage is 30~50mg/L.
Above-mentioned reacted clear liquid is taken to carry out COD CODcr and ss suspended solid mensure, Obtain following result:CODcr clearance is more than 95%, SS clearance and is more than 85%.
Embodiment 2
With embodiment 1, it is compound that the present embodiment is used the wastewater treatment operation of the present embodiment Type flocculant, in parts by weight, composed of the following components:
Graphite powder:40, iron powder:15, zinc powder:3,
Kieselguhr:3, iron sulfate:1.5, aluminum sulfate:13,
Flyash:3, ferrosilite:15, Ammonium persulfate. 5.
Above-mentioned composite flocculant is added in leading portion in pulp and paper industry waste water in proportion, mixes Close and uniformly stand 35~45min, composite flocculant dosage is 30~50mg/L waste water.
Above-mentioned reacted clear liquid is taken to carry out COD CODcr and ss suspended solid mensure, Obtain following result:CODcr clearance is more than 90%, SS clearance and is more than 90%.
Embodiment 3
With embodiment 1, it is compound that the present embodiment is used the wastewater treatment operation of the present embodiment Type flocculant, in parts by weight, composed of the following components:
Graphite powder:50, iron powder:20, zinc powder:5,
Kieselguhr:5, iron sulfate:1, aluminum sulfate:15,
Flyash:5, ferrosilite:20, Ammonium persulfate. 8.
Above-mentioned composite flocculant is added in leading portion in pulp and paper industry waste water in proportion, mixes Close and uniformly stand 35~45min, composite flocculant dosage is 30~50mg/L waste water.
Above-mentioned reacted clear liquid is taken to carry out COD CODcr and ss suspended solid mensure, Obtain following result:CODcr clearance is more than 85%, SS clearance and is more than 95%.
In above-described embodiment, described composite flocculant preparation technology is:By proportioning, will be each Component mixing after, after dispersed with stirring is uniform finished product.
Raw material for preparing composite flocculation agent in above-described embodiment is all common commercially available prod.

Claims (1)

1. a kind of pulp and paper industry method of wastewater treatment is it is characterised in that include following skill Art step:
(1) pulp and paper industry waste water removes after larger impurity through grid, enters regulating reservoir, Carry out effective regulation of water quantity and quality;
(2) and then with pump it is lifted into inclined-plate clarifying basin and carries out pretreatment, in this stage, be Insoluble COD and SS in removing waste water, adds composite flocculation agent ensureing effectively to go Except effect;After composite flocculation agent adds waste water, mix homogeneously stands 35~45min, compound Flocculant dosage is 30~50mg/L waste water;
(3) waste water after enters to be advanced into Aerobic Pond and carries out biochemical treatment, and water outlet enters two and sinks Pond carries out mud-water separation, discharge of wastewater up to standard;A mud part for second pond is back to aerobic Chi Qian, a part drains into sludge-tank;
(4) mud that each stage produces must be transported outward after concentrating and carrying out sludge press filtration dehydration To landfill or burning disposal;Waste water after filter pressing is back to regulating reservoir again;
Described composite flocculant, in parts by weight, composed of the following components:
Graphite powder:30~50, iron powder:10~20, zinc powder:1~5,
Kieselguhr:1~5, iron sulfate:1~2, aluminum sulfate:10~15,
Flyash:1~5, ferrosilite:10~20, Ammonium persulfate. 2~8.
CN201510143907.8A 2015-03-30 2015-03-30 Method for treating pulp papermaking industrial wastewater Active CN104743750B (en)

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
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
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
CN106365391A (en) * 2016-11-15 2017-02-01 佛山迅拓奥科技有限公司 Method for treating alcohol 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

Citations (2)

* Cited by examiner, † Cited by third party
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
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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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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Inventor after: Li Jialin

Inventor before: Li Guilin

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