Papermaking white water circulating treatment method and treatment device

Abstract

The invention relates to a papermaking white water circulating treatment method and treatment device. The method comprises the following steps: 1) performing white water collection and preliminary precipitation on white water produced by a fourdrinier pit; 2) recovering fibers, fillers and the like precipitated at the bottom of a white water precipitation tank to a paper machine pulp beating procedure, overflowing the excessive post-precipitation supernatant white water into a white water storage tower for collection, then pumping to be mixed with flocculant, and passing through a fiber filter to further filter out fine particles in the white water; 3) filtering the producing water filtered by the fiber filter through a laminated filter; 4) filtering the producing water filtered by the laminated filter through an ultrafiltration device; and 5) collecting the water produced by the ultrafiltration device into a clean water tank, and connecting the water of the clean water tank to a spray water tank for use by equipment. According to the technical scheme adopted in the invention, white water in papermaking production is treated through a multi-stage filtration method; and the invention has the advantages of favorable treatment effect, low energy consumption, small occupied area, easy operation management and the like.

Description

technical field [0001] The invention relates to the field of papermaking clean production, in particular to a papermaking white water treatment method and a treatment device. Background technique [0002] Papermaking white water refers to the dehydration products of the wire section, press section, and vacuum system during the papermaking process, and contains a large amount of soluble colloidal substances such as fine fibers, suspended matter of inorganic fillers, and chemical additives. Generally, the indicators of dissolved COD and BOD in untreated papermaking white water are about 300~800mg / L and 100~300mg / L respectively, and the content of suspended solids is relatively high, about 900~3 500mg / L. The discharge of water in papermaking production is very large. If it is not treated for reuse and discharged directly, it will not only pollute the environment, but also waste water resources. [0003] Cleaner production is an inevitable trend for the sustainable development ...

AI Technical Summary

Problems solved by technology

However, there are many uncertain factors in the composition and content of various dissolved organic substances, inorganic substances and microorganisms in the white water of papermaking. Simple filtration treatment and reuse technology, when the white water system of the paper machine is closed, with the fresh water entering the system and the discharged water The amount of waste water is greatly reduced, and the harmful substances accumulated in the system will greatly increase, resulting in a decline in water quality. The papermaking system may produce foam, sludge, and PH out of control, which will bring a series of papermaking obstacles to the papermaking system.

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