Reverse osmosis membrane treatment process for recycling industrial sewage and realizing zero release

Abstract

The invention relates to a reverse osmosis membrane treatment process for recycling industrial sewage and realizing zero release. The reverse osmosis membrane treatment process is characterized by adopting a lime softening, alkaline-removing and clarifying tank, a filter tank, an ultrafiltration device and a primary reverse osmosis device as a first-stage concentrating and recycling system; adopting a weak acid type cation exchanger, a strong acid type cation exchanger, a carbon remover and a concentrated water reverse osmosis device as a second-stage concentrating and recycling system; adopting a concentrating reverse osmosis device as a third-stage concentrating and recycling system; adopting an evaporation crystallizer as a crystallizing and separating device for inorganic ions of the final concentrated liquid; and connecting the three systems in series to form the treatment process. The reverse osmosis membrane treatment process is especially suitable for reduction of industrial sewage and zero-release treatment projects of enterprises. The outlet water of the process system can be recycled as supplementing water for circulating and cooling water, a water source of boiler supplementing water and other purposes; the evaporation crystal substances can be used for a chemical raw material-brine; and other pollutants such as hard substances and suspended solids (SS) in the sewage are subjected to the solid-waste treatment in the form of dry sludge.

Description

technical field [0001] The invention relates to the fields of environmental protection sewage treatment and energy saving and emission reduction, in particular to a reverse osmosis membrane treatment process for industrial sewage reuse and zero discharge. Background technique [0002] Industrial enterprises need to use a lot of water in the production process. Usually surface water or groundwater is used as the water source, and through purification and chemical water treatment, process water of different qualities that meet the needs of production equipment is obtained. In the process of purification and chemical water treatment, a certain amount of wastewater will be produced while obtaining purified water, such as filter backwash drainage, reverse osmosis concentrated water, ion exchanger regeneration wastewater, etc. In the production process, some industrial equipment or process media need to be cooled, which requires circulating cooling water. During the circulation p...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a reverse osmosis membrane treatment process for industrial sewage reuse and zero discharge, aiming at the current environmental protection requirements of the country and the requirements of enterprises for zero discharge and high reuse rate of sewage, it mainly solves the problem of reverse osmosis under normal circumstances. The recovery rate of the permeable membrane in the treatment of industrial sewage is low, and the concentration ratio cannot be too high, resulting in the problems of excessive investment and poor operation of the subsequent evaporation device

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