Advanced treatment method and processing system for wastepaper pulping and papermaking waste water

Abstract

The invention discloses a wastewater advanced treatment method of pulping and paper making from waste paper and a treatment system thereof. The system is a wastewater advanced treatment system formed in a way that a pre-coagulation tank, a coagulation reaction tank, a coagulation sedimentation tank, an advanced oxidation treatment device, a catalytic ozonation device and a biomembrane contact oxygenation device are connected in sequence. The system can realize the organic combination of the coagulation sedimentation treatment, the advanced oxidation treatment, catalytic ozonation treatment and biomembrane contact oxygenation treatment. The wastewater treatment of pulping and paper making from waste paper is carried out by the combination of physical, chemical and biological treatments, and can achieve better treatment result on the premise that low operation cost is guaranteed. After treatment, the effluent can not only meet the first class discharge standard, but also meet the requirements of industrial reused water.

Description

technical field [0001] The invention relates to a wastewater treatment technology, in particular to a treatment method and a treatment system for advanced treatment of waste paper pulping and papermaking wastewater to meet the national industrial reuse water standard, and belongs to the field of circular economy and water treatment. Background technique [0002] At present, there are many methods used in the advanced treatment of papermaking wastewater, which are mainly divided into biochemical methods, physical methods and chemical methods. [0003] Biological aerated filter technology is a new sewage treatment process developed on the basis of ordinary biological filters in the late 1980s and early 1990s by referring to the water supply filter process. It is suitable for tertiary treatment of wastewater. Since ordinary biochemical methods cannot meet the requirements of advanced treatment, the use of biological aerated filter can make up for this deficiency to a certain ex...

AI Technical Summary

Problems solved by technology

However, due to the increasingly stringent discharge indicators of papermaking wastewater in various places, this technology that only uses coagulation and filtration can no longer meet the more stringent treatment requirements of water quality indicators

[0005]Membrane technology is a relatively mature advanced treatment process. After membrane filtration, the quality of effluent water can fully meet the requirements for reuse, but there are still 10% to 25% concentrated water problems There is no way to solve it. The biodegradability of this part of the water is even worse, and the concentration of pollutants in it is high, so it still needs to be treated. This makes the membrane treatment process unable to complete the advanced treatment requirements alone. If other treatment facilities are added, it will inevitably make the already high processing costs continue to increase

Moreover, for papermaking wastewater, there will be many fine fibers in the wastewater. These fibers are easy to block the membrane pores and are difficult to clean, which reduces the life of the membrane module and leads to higher membrane treatment costs.

[0006]Due to the complexity of papermaking wastewater, the existing single treatment process has been unable to meet the treatment requirements, but how to reduce operating costs and investment costs as much as possible, and achieve the goal of papermaking The requirement for advanced treatment and reuse of wastewater is a problem that needs to be solved

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