Technological process of treating papermaking effluent for reuse based on membrane integrating technique

A process method and technical treatment technology, applied in the field of wastewater treatment of environmental protection, can solve the problems of poor removal of other substances, no comprehensive wastewater report, difficulty in regeneration of activated carbon, etc., so as to promote healthy and sustainable development and improve water quality. Resource utilization rate and the effect of reducing comprehensive water consumption per ton of paper

Active Publication Date: 2007-12-19
安徽森诺膜技术有限公司 +1
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AI Technical Summary

Problems solved by technology

[0007] Existing problems: In terms of physicochemistry, although activated carbon has the characteristics of good adsorption effect, it is difficult to regenerate activated carbon, the cost is high, and the removal effect of other substances except soluble organic matter in water is not good. Many enterprises turn to other cheap, Adsorbents with readily available materials
There are test reports on the treatment of bleaching wastewater by membrane bioreactor, and there are also test reports on the integrated treatment of papermaking wastewater by ultrafiltration technology and desalination technology such as electrodialysis, but there is no integrated process of membrane bioreactor, continuous membrane filtration technology and reverse osmosis desalination technology. Report on Treatment of Comprehensive Wastewater from Papermaking Terminals

Method used

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  • Technological process of treating papermaking effluent for reuse based on membrane integrating technique

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Experimental program
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Effect test

Embodiment 1

[0051] A paper mill in the south uses commercial wood and recycled waste paper as raw materials, and the quality of wastewater: COD cr 1500~3500mg / l, SS 1400~3000mg / l, pH6~9. After going through the mixing tank, coagulation, cooling and initial precipitation, the water enters the integrated membrane system with a treatment capacity of 2m 3 / h.

[0052] The MBR membrane module used is a 6-inch submerged columnar polyethersulfone hollow fiber membrane module, and the filtration accuracy of the membrane is 0.1 micron. The CMF membrane module is an industrial-scale internal pressure polyethersulfone hollow fiber membrane module with a diameter of 6 inches. The filtration accuracy of the membrane is 0.01 micron, and the filtration mode is full filtration. The RO membrane module is a commercially available 8-inch pollution-resistant roll-type reverse osmosis membrane module.

[0053] The operating conditions of the MBR: one operating cycle is 8 minutes, the water production is st...

Embodiment 2

[0058] The water quality and treatment capacity of waste water are identical with example 1.

[0059] The MBR membrane module used is a 6-inch submerged columnar polyvinylidene fluoride hollow fiber membrane module, and the filtration accuracy of the membrane is 0.05 micron. CMF membrane module and RO membrane module are the same as Example 1.

[0060] The operating conditions of the MBR: one operating cycle is 10 minutes, the water production is stopped for 2 minutes, and the backwash is 30 seconds. The backwash water is the water produced by the membrane bioreactor. MBR biochemical process conditions: activated sludge concentration (MLSS) 8500mg / l, sludge age 60 days. The hydraulic retention time in the anoxic section is 1.5 hours, and the dissolved oxygen (DO) concentration is 0.15 mg / L; the hydraulic retention time in the aerobic section is 20 hours, the gas-water ratio is 15:1, and the DO in the aerobic section is maintained at 3.5 mg / L; Maintain a certain aeration inte...

Embodiment 3

[0065] The water quality of waste water and waste water treatment capacity are identical with example 1.

[0066] The MBR membrane module used is a 6-inch submerged columnar polyvinyl chloride hollow fiber membrane module, and the filtration accuracy of the membrane is 0.15 microns. CMF membrane module and RO membrane module are the same as Example 1.

[0067] The operating conditions of the MBR: one operating cycle is 15 minutes, the water production is stopped for 2 minutes, and the backwash is 30 seconds. The backwash water is the water produced by the membrane bioreactor. MBR biochemical process conditions: activated sludge concentration (MLSS) 4800mg / l, sludge age 30 days. The hydraulic retention time in the anoxic section is 2.5 hours, and the dissolved oxygen (DO) concentration is 0.3mg / L; the hydraulic retention time in the aerobic section is 18 hours, the gas-water ratio is 15:1, and the DO in the aerobic section is maintained at 3.0mg / L; Maintain a certain aeration...

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Abstract

The technological process of treating papermaking effluent for reuse based on membrane integrating technique has membrane bioreactor, continuous membrane filter and reverse osmosis unit integrated for high efficiency treatment of papermaking effluent. The papermaking effluent treating process includes drum filtering and flocculating deposition to eliminate most suspended matter and colloid matter, anaerobic and aerobic biochemical treatment, filtering in membrane separating element, continuous membrane filtering, and treating with reverse osmosis membrane to reach the papermaking water standard. The present invention is especially suitable for treating hard-to-treat papermaking effluent.

Description

【Technical field】 [0001] The invention belongs to the technical field of wastewater treatment for environmental protection, and in particular relates to a new technology for environmental pollution control of papermaking wastewater treatment and reuse. 【Background technique】 [0002] With the development of the paper industry, the wastewater discharged during its production has become one of the most important sources of water pollution. At present, there are more than 10,000 large, medium and small paper mills in my country, and BOD in papermaking wastewater 5 The annual discharge is more than 2 million tons, accounting for BOD in the total discharge of wastewater in the country 5 25% of the total, and the annual discharge of wastewater is as high as more than 4 billion cubic meters, accounting for one-tenth of the total discharge of wastewater in the country, ranking second in industrial wastewater. Although my country's total water resources ranks sixth in the world, it...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/44C02F3/30C02F103/28
Inventor 陈玉海李大维马春明叶丰马競金建强
Owner 安徽森诺膜技术有限公司
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