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Papermaking waste liquor ecologic treatment and recovery circulation use

A technology for papermaking wastewater and ecological treatment, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. Operation, papermaking wastewater treatment effect is not ideal, etc.

Inactive Publication Date: 2003-05-28
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely high concentration of pollutants in papermaking wastewater and the single and unbalanced nutrient structure, the existing ecological treatment systems often have unsatisfactory treatment effects on papermaking wastewater. Goals of resourcing and continuous operation

Method used

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Examples

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Embodiment Construction

[0012] The specific implementation of the present invention is illustrated by the following examples.

[0013] A paper mill in Jiangsu has an annual output of 18,000 tons of machine-made paper, and its technology adopts the traditional domestic straw pulp production process. After papermaking black liquor is recovered and treated by alkali in the factory, the comprehensive wastewater concentration COD Cr =2600~2800mg / L, SS=450~480mg / L, pH=9~10, the daily discharge of wastewater is 15,000 tons.

[0014] Papermaking wastewater is first discharged into the sedimentation tank for primary sedimentation, and livestock manure is added to adjust the BOD 5 / COD Cr To 0.45, the effluent is lifted into the stabilization pond system through the pumping station. The stable pond consists of four ponds: anaerobic pond I, anaerobic pond II, facultative pond I, and facultative pond II. Anaerobic pond I is connected in series with facultative pond I, and anaerobic pond II is connected in ser...

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PUM

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Abstract

A process for ecologically treating and reclaiming the sewage generated during making paper includes regulating the ratio of BOD5 to CODcr in setting tank, digestion in anaerobic pool and facultativepool, regulating the ratio of CODcr:N:P in regulating tank, flowing the water through the wet ground on the surface of earth, and returning the water back to aerobic pool and regulating tank.

Description

technical field [0001] The invention belongs to the field of waste water treatment in environmental engineering, and relates to a new technological method for effective treatment and resource utilization of papermaking waste water by ecological technology. technical background [0002] Papermaking wastewater (cooking black liquor, mid-stage wastewater, white water, etc.) occurs in large quantities, and the water consumption per ton of product in my country is generally 300-400m 3 Left and right, most of them are discharged as waste water. The pollutant concentration in the waste water is high, the composition is relatively complex, it contains a large amount of papermaking raw materials and chemicals, the oxygen consumption is serious, and the COD of black liquor Cr =18000~22000mg / L, COD of comprehensive wastewater Cr =2000~3000mg / L, SS is generally between 300~500mg / L, pH is often >10 (alkaline straw pulp), and the chroma is very high, which makes it difficult to treat ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 左玉辉唐亮柏益尧
Owner NANJING UNIV
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