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Treatment for paper plant sewage

A sewage and paper mill technology, applied in biological water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of chemical pollution, poor biodegradability, high pollution concentration, etc., to achieve Reduce the load of biochemical treatment, save infrastructure costs, and have low requirements for the pool

Inactive Publication Date: 2008-05-28
FANGXIA ENTERPRISE INFORMATION CONSULTING WUJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, a large number of chemical agents such as NaoH, sodium silicate, surfactants, etc. are used in the sewage treatment of paper mills. Suspended fibers, papermaking fillers, waste paper impurities and a small amount of pectin, wax, sugar, and various organic and inorganic compounds added in the papermaking process. The treated sewage contains not only chemical agents but also ink. The main pollutants are COD, BOD, SS, discharge concentration is COD=1200-1600mg / L, BOD=350~450mg / L, SS=1000mg / L, PH=6-7. Poor, direct discharge will cause pollution to the environment, and must be treated before discharge, but the existing sewage treatment usually uses chemical methods, adding chemical agents to cause new pollution to the environment, and the removal effect of ink is not ideal

Method used

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Examples

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preparation example Construction

[0008] The preparation method of the present invention is the following steps:

[0009] The sewage generated in the papermaking process is pumped into the primary sedimentation tank through the pump, and coarse particles such as plastic bags, branches, leaves, etc. are removed in the primary sedimentation tank, and the pulp is collected through a 60-mesh nylon inclined net to ensure the recovery of pulp and the quality of effluent water. The solid content is reduced to below 800mg / kg, and the sewage treated in the primary sedimentation tank flows into the flocculation sedimentation tank for flocculation and sedimentation, and the flocculant is added according to the dosage of 10-12mg / kg, so that the solid content is reduced to below 180mg / kg, and the ink is removed The final sewage after flocculation and sedimentation flows into the coagulation tank for precipitation, and the solid content is reduced to 60mg / L by adding polyacrylamide, and the dosage is 4mg / L, which can remove ...

Embodiment 1

[0012] Equipment: 60-mesh nylon inclined net, polyacrylamide, first-grade PP cotton;

[0013] Preparation:

[0014] The sewage generated in the papermaking process is pumped into the primary sedimentation tank through the pump, and coarse particles such as plastic bags, branches, leaves, etc. are removed in the primary sedimentation tank, and the pulp is collected through a 60-mesh nylon inclined net to ensure the recovery of pulp and the quality of effluent water. The solid content is reduced to below 800mg / kg, and the sewage treated in the primary sedimentation tank flows into the flocculation sedimentation tank for flocculation and sedimentation, and the flocculant is added according to the dosage of 10-12mg / kg, so that the solid content is reduced to below 180mg / kg, and the ink is removed The final sewage after flocculation and sedimentation flows into the coagulation tank for precipitation, and the solid content is reduced to 60mg / L by adding polyacrylamide, and the dosag...

Embodiment 2

[0016] Equipment: 60-mesh nylon inclined net, polyacrylamide, and first-grade PP cotton. The preparation method is the same as in Example 1. The difference is that part of the sludge deposited in the settling tank flows back to the aeration tank, and the remaining sludge enters the sludge storage tank for further processing. Fertilizer use.

[0017] The method for treating sewage in paper mills of the invention has low pollution treatment cost, saves infrastructure costs, is beneficial to the removal of pollutants in water, and has better economic and social benefits.

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PUM

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Abstract

The invention provides a sewage treatment method for a paper making plant with small chemical dosage and good treatment effect. Large particles of sewage such as plastic bags, branches and leaves and so on are eliminated through man-made grate, slurry is collected through 60 meshes nylon inclined web, after settled down, water enters a stabilization tank to be discharged or sterilized by static and recycled, part of sludge settled down by a settlement tank returns to an aeration tank, and the residual sludge comes into a sludge storage tank, pumped up by a lift pump to a collecting well and staying for 6 hours to regulate water flow, then the residual sludge is added with coagulant and finally filtered by hollow fiber. The elimination ratios of SS and COD in sewage of the invention are respectively 85 to 98 percent and 60 to 80 percent, and the recovered long fiber can be recycled by a paper making workshop; tiny fibers are removed by a micro-strainer, biochemical treatment load is cut down, and the effluent quality is good, some water is recycled, which is beneficial to wiping off contaminants in water; a suspension train biological aeration system of the invention has low requirements for the tank, and is helpful for eliminating contaminants in water and saves the expenses of infrastructure.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a paper mill sewage treatment method. Background technique [0002] At present, a large number of chemical agents such as NaoH, sodium silicate, surfactants, etc. are used in the sewage treatment of paper mills. Suspended fibers, papermaking fillers, waste paper impurities and a small amount of pectin, wax, sugar, and various organic and inorganic compounds added in the papermaking process. The treated sewage contains not only chemical agents but also ink. The main pollutants are COD, BOD, SS, discharge concentration is COD=1200-1600mg / L, BOD=350~450mg / L, SS=1000mg / L, PH=6-7. Poor, direct discharge will cause pollution to the environment, must be treated before discharge, but the existing sewage treatment usually uses chemical methods, adding chemical agents to cause new pollution to the environment, and the ink removal effect is not ideal. Contents of the invention [0003] The p...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/10C02F3/12C02F1/52C02F103/28
CPCY02W10/10
Inventor 韩国庆
Owner FANGXIA ENTERPRISE INFORMATION CONSULTING WUJIANG
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