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A kind of treatment method of pulp and paper industry wastewater

A technology of papermaking industry wastewater and treatment method, which is applied in the process of wastewater treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost, high drug consumption, poor flocculation effect, etc. , to achieve the effect of good flocculation synergy

Active Publication Date: 2017-02-08
汕头市广利造纸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above process flow, adding flocculant is a very critical step; however, the current low-molecular flocculants such as aluminum sulfate, aluminum chloride and other aluminum salts and iron salts such as ferric chloride and ferric sulfate have poor flocculation effect, High chemical consumption and other disadvantages; and polymer flocculants such as basic polyaluminum chloride (PAC), polyaluminum sulfate, polyferric sulfate, etc., overcome the shortcomings of low processing efficiency of low molecular flocculants, but their cost is high, etc. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A pulp and paper industry wastewater treatment method, comprising the following technical steps:

[0029] (1) After the pulp and paper industry wastewater passes through the grid to remove large impurities, it enters the adjustment tank to effectively adjust the water quantity and quality;

[0030] (2) Then use the pump to lift into the inclined plate sedimentation tank for pretreatment. At this stage, in order to remove the insoluble COD and SS in the wastewater, add a composite flocculant to ensure effective removal effect; after the composite flocculant is added to the wastewater, mix evenly Stand still for 35-45 minutes, the dosage of compound flocculant is 30-50mg / L wastewater;

[0031] (3) The subsequent wastewater enters the aerobic tank for biochemical treatment, and the effluent enters the secondary sedimentation tank for mud-water separation, and the waste water that meets the standard is discharged; part of the sludge in the secondary sedimentation tank flows...

Embodiment 2

[0040] The wastewater treatment process of this embodiment is the same as that of Example 1. The composite flocculant used in this embodiment consists of the following components in parts by weight:

[0041] Graphite Powder: 40, Iron Powder: 15, Zinc Powder: 3,

[0042] Diatomaceous earth: 3, iron sulfate: 1.5, aluminum sulfate: 13,

[0043] Fly ash: 3, iron silicate: 15, ammonium persulfate 5.

[0044] Add the above-mentioned composite flocculant to the front stage of the pulp and paper industry wastewater in proportion, mix evenly and let it stand for 35-45 minutes. The dosage of the composite flocculant is 30-50 mg / L wastewater.

[0045]The clear liquid after the above reaction was taken to measure the CODcr and suspended matter SS, and the following results were obtained: the removal rate of CODcr was greater than 90%, and the removal rate of SS was greater than 90%.

Embodiment 3

[0047] The wastewater treatment process of this embodiment is the same as that of Example 1. The composite flocculant used in this embodiment consists of the following components in parts by weight:

[0048] Graphite Powder: 50, Iron Powder: 20, Zinc Powder: 5,

[0049] Diatomaceous earth: 5, iron sulfate: 1, aluminum sulfate: 15,

[0050] Fly ash: 5, iron silicate: 20, ammonium persulfate 8.

[0051] Add the above-mentioned composite flocculant in proportion to the front stage of the pulp and paper industry wastewater, mix evenly and let it stand for 35-45 minutes. The dosage of the composite flocculant is 30-50mg / L wastewater.

[0052] The clear liquid after the above reaction was taken to measure the CODcr and suspended matter SS, and the following results were obtained: the removal rate of CODcr was greater than 85%, and the removal rate of SS was greater than 95%.

[0053] In the above examples, the preparation process of the composite flocculant is: according to the pr...

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PUM

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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 [0001] The invention relates to the technical field of pulp and paper industry wastewater treatment, in particular to a treatment method for pulp and paper industry wastewater. Background technique [0002] Paper industry production is divided into two main process stages, namely pulping and papermaking. Pulping is to separate the fibers in the plant raw materials, make pulp, and then bleach; papermaking is to dilute, shape, press, dry and make paper from the pulp. Both processes use large amounts of water. In China, it takes about 100 tons (wood pulp) to 400 tons (straw pulp) of water to produce 1 ton of paper, most of which are discharged as wastewater. Papermaking wastewater contains high concentrations of BOD (biochemical oxygen demand) and SS (suspended solids), and contains a large amount of chemicals and impurities. [0003] The wastewater produced by pulping is the most polluted. The wastewater discharged during pulp washing is dark brown and is c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/52C02F103/28
Inventor 李佳林
Owner 汕头市广利造纸有限公司