Biochemical wastewater zero-discharge treatment process and treatment system

Abstract

The invention belongs to the field of water treatment and relates to a biochemical wastewater zero-discharge treatment process and a treatment system. The treatment process comprises that biochemical wastewater sequentially passes through a mechanical filter and an ultrafiltration system to obtain pretreated wastewater, and the pretreated wastewater enters a nanofiltration system to obtain first fresh water and first concentrated water; the first concentrated water passes through a SUPER NF membrane system to obtain second fresh water and second concentrated water, and the second concentrated water enters a concentrated solution collection tank 1; the first fresh water and the second fresh water sequentially pass through a reverse osmosis membrane system and a seawater reverse osmosis membrane system and a SUPER RO membrane system to be treated, and the obtained fifth concentrated water enters a concentrated solution collection tank 2; third fresh water obtained by the reverse osmosis membrane system, fourth fresh water obtained by the seawater reverse osmosis membrane system and fifth fresh water obtained by the SUPER RO membrane system are collected to a recycled water tank to be recycled; and the concentrated solution collection tank 1 and the concentrated solution collection tank 2 respectively enable the collected second concentrated water and fifth concentrated water to enter corresponding evaporation systems. The biochemical wastewater zero-discharge treatment process and the treatment system which are provided by the invention have the advantages that a series of treatment is carried out on the biochemical wastewater, and zero discharge of the biochemical wastewater is realized.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a zero-discharge treatment process and system for biochemical wastewater. Background technique [0002] Most of the traditional sewage treatment systems directly enter the biochemical wastewater into the MVR evaporation system, but due to the high COD, high content of suspended solids and high hardness in the biochemical wastewater, the MVR needs to be cleaned frequently, resulting in the processing capacity of the entire MVR system not reaching the design capacity. 80%. In order to improve the treatment capacity of reclaimed water reuse, improve the utilization rate of sewage, and strive to achieve the direct reuse of biochemical effluent after treatment, a series of researches have been carried out to solve the problems of high hardness and high COD, so as to meet the reuse water standard and realize zero discharge of biochemical wastewater . [0003] The common har...

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Problems solved by technology

Biochemical method is currently the most cost-effective means of removing organic pollution, but for wastewater with poor biochemical properties, non-biodegradable, and highly toxic, biochemical methods cannot meet the requirements.

[0005] For the reuse of reclaimed water and the advanced treatment of sewage, the commonly used technologies are the "UF+RO" process with conventional roll reverse osmosis as the core, but the recovery rate is generally 60-80%, and there is still 20-40% concentrated water It needs to be treated, this part of the concentrated water is basically evaporated by MVR, the energy consumption is high, the operating cost is high, and the factory cannot bear it

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