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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 biggest shortcomings are the accumulation of organic pollutant concentration, salt accumulation and corrosion of equipment, secondary sticky matter Papermaking and quality effects, etc.

Method used

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  • Closed circulation and zero emission processes for papermaking wastewater

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Embodiment Construction

[0016] Referring to the drawings, the waste water first passes through the grid to cut off the paper scraps, foam paper, plastic paper and large particles in the water and enters the water collection adjustment tank to adjust the water volume and uniform water quality, and then use the pump to lift the water to the inclined screen for recycling After that, the waste water flows into the shallow air flotation tank for flocculation and air flotation reaction. It passes through the dynamic water outlet and the static water outlet, and the uplift distance is minimized, and it is not affected by the water outlet flow rate, so that the suspension floats vertically to the water surface in a relatively static environment. At the same time, according to a certain amount (depending on the water quality), add flocculant polyacrylamide (PAM) and polyaluminum chloride (PAC), the depth of the pool is only about 450mm, and the residence time of sewage in the air floatation is only 3-5min Trad...

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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...

Claims

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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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