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Treatment process for recycling water in pulping and papermaking wastewater

A technology of pulping and papermaking and treatment process, which is applied in the direction of waste water treatment in the processing process, multi-stage water/sewage treatment, oxidized water/sewage treatment, etc. The effect of simple process and simple management

Active Publication Date: 2012-07-04
SHANGHAI EMPEROR OF CLEANING HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects that existing methods for treating pulping and papermaking wastewater are difficult to effectively treat pulping and papermaking wastewater to reach the discharge standard, let alone realize the reuse of reclaimed water, and provide a method for effectively treating pulping and papermaking wastewater. Pulping and papermaking wastewater reclaimed water treatment process for realizing reuse of reclaimed water

Method used

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  • Treatment process for recycling water in pulping and papermaking wastewater

Examples

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Comparison scheme
Effect test

Embodiment 1

[0057] A trial production test was carried out on the pulping wastewater produced by a pulp and paper mill (see attached figure 1 ), the design water volume of the system is 1800m 3 / d. Influent water (most of the data) indicators are: COD is 3000-4000mg / L, BOD is 800-1300mg / L, SS is 600-800mg / L, and chroma is 300-450 times.

[0058] Pulping and papermaking wastewater water reuse treatment process: the pulping and papermaking wastewater is treated by anaerobic treatment after removal of suspended solids, then aerobic treatment by oxidation ditch, and then enters the secondary settling tank for sedimentation to separate mud and water, and then coagulates and settles , filter, and then carry out ozone catalytic oxidation treatment; wherein,

[0059] The removal of suspended solids is through coagulation reaction and primary sedimentation treatment: the dosage of polyaluminum chloride in the coagulation reaction is 250mg / L, the dosage of polyacrylamide is 2mg / L, and the reactio...

Embodiment 2

[0069] A trial production test was carried out on the production wastewater of a pulp and paper mill. The design water volume of the system is 3000m 3 / d. Influent water (most of the data) indicators are: COD is 2500-3500mg / L, BOD is 700-1000mg / L, SS is 500-800mg / L, and chroma is 280-400 times.

[0070] Pulping and papermaking wastewater water reuse treatment process: the pulping and papermaking wastewater is treated by anaerobic treatment after removal of suspended solids, then aerobic treatment by oxidation ditch, and then enters the secondary settling tank for sedimentation to separate mud and water, and then coagulates and settles , filter, and then carry out ozone catalytic oxidation treatment; wherein,

[0071] The removal of suspended solids is through coagulation reaction and primary sedimentation treatment: the dosage of polyaluminum chloride in the coagulation reaction is 200mg / L, the dosage of polyacrylamide is 2mg / L, and the reaction time is 25min, the sedimentat...

Embodiment 3

[0081] A trial production test was carried out on the production wastewater of a pulp and paper mill. The design water volume of the system is 3500m 3 / d. Influent water (most of the data) indicators are: COD is 2000-3000mg / L, BOD is 600-1000mg / L, SS is 400-700mg / L, and chroma is 250-400 times.

[0082] Pulping and papermaking wastewater water reuse treatment process: the pulping and papermaking wastewater is treated by anaerobic treatment after removal of suspended solids, then aerobic treatment by oxidation ditch, and then enters the secondary settling tank for sedimentation to separate mud and water, and then coagulates and settles , filter, and then carry out ozone catalytic oxidation treatment; wherein,

[0083] The removal of suspended solids is through coagulation reaction and air flotation treatment: the dosage of polyferric sulfate in the coagulation reaction is 180mg / L, and the dosage of polyacrylamide is 2mg / L , the reaction time is 20min, the residence time of th...

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Abstract

The invention discloses a treatment process for recycling water in pulping and papermaking wastewater. The treatment process comprises the following steps of: removing suspended matters of the pulping and papermaking wastewater and carrying out anaerobic treatment; and then, carrying out aerobic treatment through an oxidation ditch and inputting the wastewater into a secondary sedimentation basin to precipitate and carry out mud-water separation; and then, carrying out coagulating sedimentation and filtering; and finally, carrying out ozone catalytic oxidation treatment to obtain the water. The treatment process provided by the invention has the advantages of simple process flow, lower construction and operation cost and simplicity in management, and can effectively treat the pulping and papermaking wastewater and realize reuse of reclaimed water, so that the treatment process has an extremely good application prospect.

Description

technical field [0001] The invention relates to a water reuse treatment process for pulping and papermaking wastewater. Background technique [0002] The shortage of water resources has long attracted the attention of the international community. More than 100 countries around the world are short of water, including China. my country's total water resources are considerable, ranking fourth in the world, but its per capita water resources rank 109th in the world. [0003] In my country, the discharge of pulp and paper industry wastewater is as high as more than 4 billion m 3 , accounting for 1 / 10 of the country's total wastewater discharge. There are many types of pollutants in pulping and papermaking wastewater, and the pollution concentration is high. Generally, COD is 2000mg / L-5000mg / L, BOD is 700mg / L-1800mg / L, and SS (suspended solids in water quality) is 500mg / L-1200mg / L. The chromaticity is 250-800 times, and the structure of the pollutants is complex, which is the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/78C02F103/28
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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