Reverse osmosis concentrated water oxidizing and desalting method and system of organic wastewater

Abstract

The invention provides a reverse osmosis concentrated water oxidizing and desalting method and system of organic wastewater. The method comprises the following steps: S1, performing primary reverse osmosis treatment on the organic wastewater to obtain primary reverse osmosis wastewater; S2, performing an oxidizing reaction on the primary reverse osmosis wastewater under the action of an oxidant to obtain oxidized wastewater; S3, softening the oxidized wastewater under the action of a softener to obtain softened wastewater; S4, coagulating the softened wastewater under the action of a coagulant and a coagulant aid; S5, precipitating a product in the S4 to obtain supernatant wastewater; S6, performing a neutralizing reaction on the supernatant wastewater; S7, performing multimedia filtration on the wastewater neutralized in the S6 to obtain primary filtered wastewater; S8, ultra-filtering the primary filtered wastewater to obtain secondary filtered wastewater; and S9, performing secondary reverse osmosis on the secondary filtered wastewater to obtain secondary concentrated water and reclaimed water.

Description

technical field [0001] The invention belongs to the technical field of waste water recycling and treatment, and relates to a method and system for oxidation and desalination of organic waste water reverse osmosis concentrated water. Background technique [0002] my country's per capita water resources are about 2,000 cubic meters, which is a moderate water shortage level according to international standards. In addition, due to the differences in regions and schedules of water resource distribution in my country, about two-thirds of the country's 600 cities are "severely water-deficient" or "water-deficient" cities. Among them, 16 provinces are in moderate water shortage level, and 6 provinces are in extreme water shortage level. However, restricted by people's awareness of environmental protection and water treatment facilities, a large amount of untreated or substandard treated wastewater enters rivers and lakes, posing a huge threat to the water environment. The shortag...

AI Technical Summary

Problems solved by technology

The main problem of the "ultrafiltration + reverse osmosis" double-membrane process is that the water production rate of the reverse osmosis membrane technology is generally less than 75%, and about 30% of the concentrated water is produced.

However, this reverse osmosis concentrated water treatment method uses electrochemical flocculation, electrocatalytic redox, electric floatation, high-efficiency precipitation and multimedia filtration processes to pretreat reverse osmosis concentrated water and then enters ultrafiltration and reverse osmosis devices for concentrated water desalination. This pretreatment process has no reverse osmosis concentrated water softening process and has a limited effect on the removal of organic matter in reverse osmosis concentrated water, making ultrafiltration, reverse osmosis, and electrodialysis membranes easy to clog, reducing the service life of the membrane and not suitable for high organic content reverse osmosis Reprocessing of Concentrated Water

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