Closed circulation and zero emission processes for papermaking wastewater

A closed-cycle, paper-making wastewater technology, applied in processing process wastewater treatment, aerobic and anaerobic process treatment, flotation water/sewage treatment, etc., can solve secondary sticky copying and quality impact, organic pollutant concentration Accumulation, equipment corrosion and other problems can be achieved to reduce the processing burden, reduce fiber loss, and ensure the effect of processing

Inactive Publication Date: 2010-05-19
SHAANXI UNIV OF SCI & TECH
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Problems solved by technology

[0006] At present, waste paper and papermaking wastewater at home and abroad mostly use physical and chemical + aerobic treatment process to treat papermaking wastewater. The bigge

Method used

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  • Closed circulation and zero emission processes for papermaking wastewater

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[0016] As shown in the attached drawings, the waste water passes through the grid to cut off the paper scraps, foamed paper, plastic paper and large particles in the water and enters the water collection regulating tank to adjust the water volume and uniform water quality, and then the water is lifted to the inclined net for recycling by a pump Fiber, then the waste water flows into the shallow air flotation tank for flocculation and air flotation reaction. It discharges the water statically through dynamic effluent, and the floating distance is minimized, and is not affected by the effluent flow rate, so that the floating body floats vertically to the surface in a relatively static environment At the same time, add the flocculating agent polyacrylamide (PAM) and polyaluminum chloride (PAC) according to a certain amount (depending on the water quality). The depth of the pond is only about 450mm, and the residence time of the sewage in the air flotation is only 3~5min ( Tradition...

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Abstract

The invention discloses closed circulation and zero emission processes for papermaking wastewater, which adopts the process flows of a super-efficient air floating device plus anaerobic biochemical treatment plus aerobic biochemical treatment, wherein the CODCr of effluent water, the BOD5, the concentration of suspended substances (SS) and the average value of the turbidity (10d) are 65.9mg/L, 26.7mg/L, 38.7mg/L and 23NTU respectively, and fully meet the national standard for recycling or discharge. The processes not only can effectively reduce the burden of wastewater treatment, ensure the treatment effect of the wastewater, but also can effectively reduce the fiber loss, reduce production cost, and can bring huge environmental and economic benefits to enterprises.

Description

technical field [0001] The invention is a technology for closed circulation of water in the pulping and papermaking process, and particularly relates to a closed circulation and zero discharge process for papermaking waste water. Background technique [0002] The essence of the closed cycle and "zero discharge" technology of wastewater is to reduce water consumption and comprehensively improve the utilization efficiency of water resources by continuously improving design, adopting advanced technology and equipment, improving and strengthening management, and comprehensive utilization. So as to achieve the goal of "win-win" economic and social benefits. It is an advanced technology adopted by paper-making enterprises in recent years to improve water efficiency and minimize environmental pollution caused by sewage discharge, and it is also an advanced management concept. Compared with the traditional papermaking industrial process and the process of papermaking wastewater con...

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Application Information

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IPC IPC(8): C02F9/14C02F9/02C02F1/24C02F1/52C02F3/30C02F103/28
Inventor 王森张安龙杜飞景立明任涛樊砥钢肖琳
Owner SHAANXI UNIV OF SCI & TECH
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