Zero-emission recycling device for water paper or raw cement board papermaking wastewater

Abstract

The invention discloses a zero-emission recycling device for water paper or raw cement board papermaking wastewater. The outlet of a wastewater conveying component (2) is communicated with a total wastewater collecting tank (1); exhaust ports of a pulping wastewater pond (3), a screening wastewater pond (4), a sheet forming wastewater pond (5) and a squeezing wastewater pond (6) are communicated with the wastewater conveying component; a water inlet of a first wastewater recycling pump (2) is communicated with the total wastewater collecting tank (1); a water outlet of the first wastewater recycling pump (7) is connected with a recycle water conveying tube (7a) for providing recycle water to a pulper (8); the sheet forming wastewater pond is provided with a wastewater outlet for providing dilution water to a paper pulp diluting pond (10); the screening wastewater pond is provided with a wastewater outlet for providing recycle water to the pulper; the water inlet of the second wastewater recycling pump (11) is connected with the squeezing wastewater pond; and the water outlet of the second wastewater recycling pump (11) is connected with a recycle water tube (11a) for cleaning a papermaking blanket. According to the zero-emission recycling device disclosed by the invention, the wastewater can be completely recycled without emission; and precipitates and suspended solids of each wastewater pond are recycled for producing, so that the preparation cost and the operation cost are reduced.

Description

technical field [0001] The invention relates to a zero-discharge recycling device for papermaking wastewater, in particular to a zero-discharge recycling device for papermaking wastewater used in the production of firecrackers, firecrackers and leads, etc., from waste paper or raw pulp boards, and is also applicable to the production of corrugated paper and yellow cardboard , kraft paper and other papermaking wastewater zero discharge. Background technique [0002] Waste paper papermaking wastewater includes pulping wastewater, pulp screening wastewater, paper machine operation wastewater, paper machine operation wastewater is also called paper machine wastewater, paper machine wastewater includes paper forming wastewater, press wastewater, and cleaning wastewater for cleaning felts. At present, there are devices for treating waste paper and papermaking wastewater. After dosing, first use high-efficiency shallow air flotation equipment for treatment, or after sedimentation t...

AI Technical Summary

Problems solved by technology

The "zero discharge process of papermaking wastewater" involves the process of paper machine wastewater treatment and reuse, including the separation of concentrated white water and dilute white water. Pool filtration and radial flow sedimentation tank sedimentation processes involve many unit facilities and high manufacturing costs, and only involve paper machine wastewater treatment and reuse in papermaking wastewater, and the generated sediment sludge needs to be processed After it is made into slag cake, it can be reused, and the sediment cannot be directly used for production, and there are many processes

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