CN101186413A

CN101186413A - Treatment for paper plant sewage

Info

Publication number: CN101186413A
Application number: CNA200710156789XA
Authority: CN
Inventors: 韩国庆
Original assignee: Wujiang Fangxia Enterprise Information Consultation Co Ltd
Current assignee: Wujiang Fangxia Enterprise Information Consultation Co Ltd
Priority date: 2007-11-28
Filing date: 2007-11-28
Publication date: 2008-05-28

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

The processing of paper plant sewage

Technical field

The present invention relates to a kind of method of sewage disposal, especially the treatment process of paper plant sewage.

Background technology

Paper factory sewage disposal is used chemical agent such as NaoH in a large number at present, water glass, tensio-active agent etc., the main pulping of handling from waste paper, screening, the waste water that produces in flotation and the paper-making process, major ingredient in the waste water is tiny suspension fiber, papermaking filler, waste paper impurity and a small amount of pectin, wax, all kinds of organic and mineral compound that adds in carbohydrate and the paper process, not only there is chemical agent also to contain printing ink in the sewage after the processing, principal pollutant are COD, BOD, SS, emission concentration is COD=1200-1600mg/L, BOD=350～450mg/L, SS=1000mg/L, PH=6-7, the pollution concentration of such waste water is higher, biodegradability is relatively poor, directly the discharging meeting pollutes environment, could discharge after must handling, but chemical process is adopted in existing sewage disposal usually, increased chemical agent environment has been caused new pollution, and undesirable to the removal effect of printing ink.

Summary of the invention

It is little to the purpose of this invention is to provide a kind of used chemical dose, the treatment process of the paper plant sewage that treatment effect is good.

For realizing that technical scheme provided by the present invention is:

A kind of treatment process of paper plant sewage, it is characterized in that sewage is through artificial grid, remove big particle such as plastics bag, branch, leaf etc., tiltedly net the receipts slurry through 60 order nylon, heavy clear back water advances people's stabilization pond and discharges or reuse behind electrostatic sterilization, and the sedimentary sludge part of settling pool is back to the aeration tank, excess sludge enters mud storage pond, again through lift pump to 6 hours pump well residence time regulating pondage, add coagulating agent, filter with tubular fibre at last.

SS clearance 85%-98% in the sewage that present method is handled, COD clearance 60%-80%, but fiber fines is removed with Microfilter in the macrofiber direct reuse workshop of reclaiming, and reduces the biochemical treatment load, and effluent quality is good, the portion water reuse helps water pollutant and removes, and suspension chain bio-aeration system requires low to the pond, help water pollutant and remove, saved capital cost.

Embodiment

In the actually operating, sewage is through artificial grid, remove big particle such as plastics bag, branch, leaf etc., tiltedly net the receipts slurry through 60 order nylon, heavy clear back water advances people's stabilization pond and discharges or reuse behind electrostatic sterilization, and the sedimentary sludge part of settling pool is back to the aeration tank, excess sludge enters mud storage pond, again through lift pump to 6 hours pump well residence time regulating pondage, add coagulating agent, filter with tubular fibre at last.

Preparation method of the present invention is following steps:

The sewage that produces in the paper-making process is squeezed into preliminary sedimentation tank by pump, in preliminary sedimentation tank, remove big particle such as plastics bag, branch, leaf etc., tiltedly net the receipts slurry through 60 order nylon, to guarantee the yield and the effluent quality of slurry, solids is dropped to below the 800mg/kg, the sewage inflow flocculation sedimentation tank of handling through preliminary sedimentation tank carries out flocculation sediment, the dose that adds by 10-12mg/kg adds flocculation agent, solid substance is dropped to below the 180mg/kg,, make solid substance drop to 60mg/L by adding polyacrylamide except that the sewage behind the removal ink flows into the coagulation basin precipitation through the water behind the flocculation sediment, adding dose is 4mg/L, can remove 90% ink particle, send into the cotton filtration of PP through water pump again, remove the impurity of diameter greater than 20um, through after the filtration of quartz sand, filter through one-level PP is cotton again, arrive emission standard greatly, can directly discharge.

Below in conjunction with embodiment content of the present invention is described further:

Embodiment one

Equipment: the oblique net of 60 order nylon, polyacrylamide, one-level PP cotton;

The preparation method:

Embodiment two

Equipment: the oblique net of 60 order nylon, polyacrylamide, one-level PP cotton, its preparation method are with embodiment one, and difference is that the sedimentary sludge part of settling pool is back to the aeration tank, and excess sludge enters mud storage pond and does the fertilizer use.

The treatment process of paper plant sewage of the present invention, it is low to locate dirty cost, saves capital cost, helps water pollutant and removes, and better economic and social benefit are arranged.

Claims

1. the treatment process of a paper plant sewage, it is characterized in that: sewage is through artificial grid, remove big particle such as plastics bag, branch, leaf etc., tiltedly net the receipts slurry through 60 order nylon, heavy clear back water advances people's stabilization pond and discharges or reuse behind electrostatic sterilization, and the sedimentary sludge part of settling pool is back to the aeration tank, excess sludge enters mud storage pond, again through lift pump to 6 hours pump well residence time regulating pondage, add coagulating agent, filter with tubular fibre at last.

2. according to claim 1, it is characterized in that the preparation method is following steps: the sewage that produces in the paper-making process is squeezed into preliminary sedimentation tank by pump, in preliminary sedimentation tank, remove big particle such as plastics bag, branch, leaf etc., tiltedly net the receipts slurry through 60 order nylon, to guarantee the yield and the effluent quality of slurry, solids is dropped to below the 800mg/kg, the sewage inflow flocculation sedimentation tank of handling through preliminary sedimentation tank carries out flocculation sediment, the dose that adds by 10-12mg/kg adds flocculation agent, solid substance is dropped to below the 180mg/kg, except that the sewage behind the removal ink flows into the coagulation basin precipitation through the water behind the flocculation sediment, make solid substance drop to 60mg/L by adding polyacrylamide, adding dose is 4mg/L, can remove 90% ink particle, send into the cotton filtration of PP through water pump again, remove the impurity of diameter,, filter through one-level PP is cotton again through after the filtration of quartz sand greater than 20um, big to emission standard, can directly discharge.