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Method for treating and recycling waste paper making wastewater

A waste paper papermaking and wastewater treatment technology, which is applied in the directions of biological water/sewage treatment, adsorption water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of long biochemical residence time, save floor space, improve Recycling rate, effect of reducing concentration

Active Publication Date: 2009-09-30
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the residence time of facultative oxygen is generally more than several hours, and the biochemical residence time is longer

Method used

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  • Method for treating and recycling waste paper making wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] COD cr 1120mg / L, BOD 5 Waste paper and papermaking wastewater with a concentration of 340mg / L and a SS of 960mg / L enters the physical and chemical treatment unit, and the mesh holes of the inclined sieve are used to intercept the coarse fiber and recycle the fiber at the same time. The mesh size is 120 mesh; the effluent of the inclined sieve enters the high-efficiency sedimentation tank , add the coagulant polyaluminum chloride, the dosage of the coagulant is 10mg / L, and remove most of the suspended solids through coagulation and inclined plate sedimentation tank, in which the coagulation time is 9min, and the surface load of the inclined plate sedimentation tank 18m / h; the effluent from the high-efficiency sedimentation tank enters the sewage filter, which mainly relies on the filter material for filtration. The effluent of the nano-pollution filter enters the enhanced adsorption section of the biochemical treatment unit, and uses high-concentration sludge to absorb ...

Embodiment 2

[0027] COD cr 3458mg / L, BOD 5 680mg / L, SS 3000mg / L waste paper papermaking wastewater enters the physical and chemical treatment unit, uses the mesh holes of the inclined screen to intercept the coarse fiber, and recycles the fiber at the same time, the mesh size is 100 mesh; the water from the inclined screen enters the high-efficiency sedimentation tank , add the coagulant polyaluminum chloride, the dosage of the coagulant is 25mg / L, remove most of the suspended solids through coagulation and inclined plate sedimentation tank, the coagulation time is 12min, and the surface load of the inclined plate sedimentation tank 15m / h; the effluent from the high-efficiency sedimentation tank enters the sewage filter, which mainly relies on the filter material for filtration. The effluent of the nano-pollution filter enters the enhanced adsorption section of the biochemical treatment unit, and uses high-concentration sludge to absorb and absorb some pollutants. The hydraulic retention ...

Embodiment 3

[0029] COD cr 2373mg / L, BOD 5 540mg / L, SS 1800mg / L waste paper papermaking wastewater enters the physical and chemical treatment unit, uses the mesh holes of the inclined screen to intercept the coarse fiber, and recycles the fiber at the same time, the mesh size is 110 mesh; the water from the inclined screen enters the high-efficiency sedimentation tank , adding coagulant polyaluminum chloride, the dosage of coagulant is 13mg / L, most of the suspended solids are removed through coagulation and inclined plate sedimentation tank, the coagulation time is 12min, and the surface load of inclined plate sedimentation tank 16m / h; the effluent from the high-efficiency sedimentation tank enters the sewage filter, which mainly relies on the filter material for filtration. The effluent of the nano-pollution filter enters the enhanced adsorption section of the biochemical treatment unit, and uses high-concentration sludge to absorb and absorb some pollutants. The hydraulic retention time...

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Abstract

The invention discloses a method for treating and recycling waste paper making wastewater. The waste paper making wastewater enters a physicochemical treatment unit, crude fiber substances in the wastewater are intercepted by meshes of an inclined screen, and simultaneously fibers are reclaimed; then the wastewater enters an efficient sedimentation tank, a coagulation agent is added in a quick coagulation area of the efficient sedimentation tank, most suspended substances are removed through coagulation and inclined plate sedimentation, and a part of settled sludge reflows to the quick coagulation area; the yielded water of the efficient sedimentation tank flows into a sludge accommodating filter pool, and a part of the yielded water of the sludge accommodating filter pool is recycled; and the rest yielded water of the sludge accommodating filter pool enters a strengthening adsorption section of a biochemical treatment unit, a part of pollutants is adsorbed and absorbed by high-concentration sludge, then the yielded water enters an aerobic biochemical section and the pollutants are degraded by aerobic bacteria, the yielded water enters a sedimentation tank, a part of yielded water after sedimentation is recycled, and the rest processed water is discharged after reaching standards. The method adopts the efficient sedimentation tank to reduce the adding amount of agents and reduce anionic garbage in recycled sewage, and recycles sludge accommodating filtered water and biochemical treatment water twice to improve the recycling rate of the waste paper making wastewater.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for treating and reusing waste paper and papermaking wastewater. Background technique [0002] Compared with the use of native plant fiber pulping and papermaking, the wastewater pollution generated by waste paper and papermaking is greatly reduced, but it still far exceeds the discharge standard. About 50% of the fillers, 20% of the fine fibers and 95% of the ink in the waste paper enter the wastewater. At the same time, the addition of deinking agents also increases the difficulty of wastewater treatment to a certain extent. The common feature of waste paper and papermaking wastewater is that the content of insoluble pollutants such as suspended solids is high, and the soluble COD and BOD indicators in the wastewater are low (compared to chemical pulping). [0003] Pollutants in papermaking sewage can be roughly divided into three parts: 1. Short fibers, which refer to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14D21F1/82C02F1/52C02F1/28C02F3/12
CPCY02W10/10
Inventor 徐灏龙仝武刚
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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