Novel waste paper papermaking waste water comprehensive treatment method and system

Abstract

The invention relates to the technical field of waste paper papermaking waste water comprehensive treatment methods. The waste paper papermaking waste water comprehensive treatment method provided by the invention comprises the following steps of: recycling fibers by filtering waste water with an inclined screen of 80-100 meshes; introducing the waste water filtered by the inclined screen into a primary sedimentation tank, sequentially adding flocculant and coagulant aid, introducing waste water at the upper part into a condensation tank A, and sedimenting the waste water at the lower part and recycling the fibers, wherein the condensation tank A comprises an acidification hydrolysis tank and a tank O; according to waste water treatment requirements and the condition of meeting the standard or not, introducing the waste water, which flows out from the tank O and stays for 1-3 hours in a secondary sedimentation tank, into a high-efficiency cavitation air floatation tank, and then filtering by virtue of a rotary table filter; and disinfecting clear liquid after filtering by ultraviolet light and then introducing the disinfected clear liquid into a papermaking workshop to be recycled. The waste paper papermaking waste water comprehensive treatment method provided by the invention can carry out deep treatment on dissolvable substances, suspension solid matters and bacterial population in waste water, the purified waste water can be directly recycled, part of the waste water can be directly discharged, and fine fibers obtained during treatment can be utilized, so that resource is really recycled and energy-saving effect is good.

Description

technical field [0001] The invention relates to a wastewater comprehensive treatment system, in particular to a production wastewater comprehensive treatment system utilizing waste paper for papermaking. Background technique [0002] The pollutants in papermaking wastewater using waste paper as raw material mainly include hemicellulose, lignin, inorganic salts, fine fibers, starch, titanium dioxide, ink, dyes, etc. Lignin, hemicellulose, starch, etc. mainly form CODcr and BOD in wastewater 5 ; Fine fibers mainly form suspended solids. Among them, COD is divided into soluble COD and insoluble COD, and insoluble COD is the main one. When the suspended matter in wastewater is removed, most of the insoluble CODcr is also removed at the same time, leaving more difficult to remove. Soluble COD. [0003] In the paper production process, many additives such as preservatives, bactericides, defoamers, etc. have a low retention rate in the pulp, and a considerable part is discharged...

AI Technical Summary

Problems solved by technology

At the same time, in order to reduce pollution and save power consumption, the current papermaking workshop has established a white water circulation system. The water consumption of the system has been greatly reduced and the degree of closed circulation of papermaking white water has been improved, so that these soluble substances accumulate in the system. As a result, the soluble COD in the wastewater gradually increased, and the treatment of papermaking wastewater became more difficult.

[0004] In addition, the national, provincial and municipal papermaking wastewater discharge water quality standards are constantly improving, which also makes the traditional single wastewater treatment mode unable to meet the treatment requirements. For papermaking wastewater with increasingly complex components, it has become inevitable to develop a new comprehensive wastewater treatment system.

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