Water circulation system for pulping and papermaking

Abstract

The invention discloses a water circulation system for pulping and papermaking, which comprises a pulping system, a papermaking system and a sewage system; the pulping system comprises a pulping section used for removing impurities after fiber raw materials are crushed and a pulping disc concentrator used for concentrating pulp; the papermaking system comprises a paper machine for removing moisture after forming paper and a papermaking disc thickener for concentrating white water of the paper machine, and the sewage system comprises a primary sewage treatment unit for mechanically treating sewage, a secondary sewage treatment unit for biologically treating the sewage and a tertiary sewage treatment unit for deeply treating the sewage. The water circulation system further comprises a recycling water tank, wherein the secondary sewage treatment unit is connected with the recycling water tank, the recycling water tank is connected with the pulping section, and the middle-section treated water discharged by the secondary sewage treatment unit is conveyed to the pulping section to serve as disintegrating white water. According to the invention, advanced sewage treatment cost is reduced, pulping and papermaking water circulation is accelerated, and accumulation of COD and anionic garbage in a pulping and papermaking workshop is reduced.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a water circulation system for pulping and papermaking. Background technique [0002] The pulp and paper industry consumes a lot of water resources, and all paper workers are committed to water conservation and emission reduction. With the innovation of technology and technological progress, the water consumption per ton of papermaking products has achieved results, but further water conservation has caused the water system to be closed. The increase of anionic garbage in the papermaking system reduces the effective components of papermaking auxiliaries and increases the cost. At the same time, it accelerates the growth of bacteria in the system, causing snot-like bacteria sludge to affect the product and operation. In addition, the COD of workshop drainage increases significantly, which brings a large load to sewage treatment, especially for waste pap...

AI Technical Summary

Problems solved by technology

[0002] The pulp and paper industry consumes a lot of water resources, and all paper workers are committed to water conservation and emission reduction. With the innovation of technology and technological progress, the water consumption per ton of papermaking products has achieved results, but further water conservation has caused the water system to be closed. The increase of anionic garbage in the papermaking system reduces the effective components of papermaking auxiliaries and increases the cost

At the same time, it accelerates the growth of bacteria in the system, causing the snot-like bacteria sludge to affect the product and operation. In addition, the COD of the workshop drainage is greatly increased, which brings a large load to the sewage treatment, especially the waste paper pulping and papermaking. The above problems are becoming more and more prominent.

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