Processing method for reducing and recycling organic waste water and processing system

Abstract

The invention provides a processing method for reducing and recycling organic waste water. The method comprises steps: (1) pre-treating waste water to obtain pre-treated out-water; (2) treating the out-water obtained from the step (1) through solid-liquid separation; (3) nano-filtering the out-water obtained from step (2); (4) treating nano-filtered concentrated water obtained from the step (3) to obtain out-water subjected concentrated water nano-filtering, returning to the step (3) for mixing the out-water subjected to concentrated water nano-filtering with the out-water subjected to solid-liquid separation, and performing nano-filtering; (5) performing first reverse osmosis treatment on out-water obtained from the step (3) through nano-filtering; (6) performing second reverse osmosis treatment on concentrated water obtained from the step (5) through first reverse osmosis treatment; and (7) evaporating and crystallizing a concentrated liquid obtained from the step (6) through second reverse osmosis treatment in order to obtain crystallized salt and evaporated concentrated water. The invention further provides a processing system of the method. Through the method and system, waste water is truly reduced and recycled.

Description

technical field [0001] The invention relates to the technical field of waste water treatment, in particular to a treatment method for organic waste water reduction and resource recovery, and an organic waste water reduction and resource recovery treatment system for implementing the method. Background technique [0002] At present, the emission standards of industries such as coal chemical industry, petrochemical industry, and printing and dyeing industry are becoming increasingly stringent. Wastewater reduction and resource utilization have gradually become an inevitable choice for all industries and society. In the actual treatment process, due to the constraints of treatment technology and treatment costs and other factors, the reclaimed water produced in the treatment process is mainly divided into two types: the first kind of reclaimed water is the filtered water after biochemical treatment, and this kind of reclaimed water can be recycled It is subdivided into multi-me...

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Problems solved by technology

The first kind of reclaimed water has many problems such as more foam, peculiar smell, corrosiveness and / or strong fouling in the actual use process due to the large residual macromolecular refractory organic matter and multivalent ions, and the scope of use is greatly restricted big limit

The second type of reclaimed water is water produced by reverse osmosis. Its water quality is better, but the treatment cost is expensive, and reverse osmosis produces a large amount of concentrated organic wastewater with high concentration of various pollutants, which cannot be discharged.

Although this process proposes a treatment method for nanofiltration concentrated water and reverse osmosis concentrated water, due to the large amount of nanofiltration concentrated water and reverse osmosis concentrated water, the concentration of organic matter in nanofiltration concentrated water is low, and the calorific value is low, so sintering treatment is adopted. The treatment cost is expensive; although the concentrated reverse osmosis water has been concentrated, its salt content is still low, and if it is treated by evaporation, the treatment cost is high

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