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Closed treatment method of paper-making waste water with sulfite

A pulping wastewater and sulfite technology, applied in the regeneration of sulfite waste liquid, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of lack of treatment methods for papermaking red liquor, and achieve operating costs Low, reduce the effect of investment

Inactive Publication Date: 2002-10-16
尤丹丹
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a lack of effective treatment methods for papermaking red liquor.

Method used

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  • Closed treatment method of paper-making waste water with sulfite
  • Closed treatment method of paper-making waste water with sulfite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] A paper company uses amorpha as raw material to produce ammonium sulfite pulp, with an annual output of 25,000 tons of paper, located in a saline-alkali area short of water. Most of the sewage is reused after being stored in the big pond.

[0021] The method of the present invention is used for treatment, and the sewage enters the anaerobic tank, and then adds the seed liquid cultivated by the old red liquor. Temperature T=30-45°C, residence time: HRT=5h, then enter the aeration tank, T=20-30°C, HRT=5h.

[0022] Raw water COD cr mg / L

[0023] When performing fine treatment, it will be treated with a microporous filter and an ozone generator. After drying, the sludge can be sent to a nearby brick factory or recycled chemicals.

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Abstract

The closed treatment of papermaking waste water with sulfites, including ammonium sulfite and sodium sulfite, consists of bacteria strain culture, biochemical treatment, separation of lignin and other matters in alkali or neutral condition, gas floating, filtering, and returning filtrate for reuse in digestion and pulp making. The present invention has the advantages of complete treatment, recovery of all water and reduced investment and running cost.

Description

field of invention [0001] The invention relates to the field of environmental protection, and relates to a treatment method for sulfite pulping and papermaking wastewater. Background technique [0002] Sulphite pulp and paper wastewater contains large amounts of lignosulfonates, hemicelluloses and sugars. Because of their strong hydrophilicity, simple acid analysis is difficult to use. Adopting the concentration method requires large investment and high energy consumption, making it difficult to implement. Therefore, a large number of manufacturers failed to complete the governance work and were facing closure or had already closed down. cause serious socioeconomic problems. A reliable and thorough approach to governance is urgently needed. Chinese Patent Announcement 1245845 discloses "A Treatment Method for Closed Papermaking Wastewater", which describes the closed treatment method for black liquor, middle water and white water. However, there is still a lack of effec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14D21C11/02
Inventor 尤丹丹
Owner 尤丹丹
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