Treatment method for reverse osmosis concentrated water

Abstract

The invention relates to a treatment method for reverse osmosis concentrated water, in particular to a standard treatment method for the reverse osmosis concentrated water which is produced during sewage reusing. The treatment method comprises the following steps: the pH value of the reverse osmosis concentrated water is regulated to be 2.0-4.0, and electrolytic catalysis oxidation is carried out; water produced from the electrolytic catalysis oxidation is subjected to redox reaction in an electrolytic reactor, which is filled with iron-carbon fillers obtained through sintering of iron and carbon; hydrogen peroxide is then added, so that oxygenolysis is further achieved; the pH value is regulated to be 6.0-8.0, and a flocculant is added for flocculent settling; a supernate obtained from the flocculent settling enters an aeration biological tank, and a co-substrate is added for biological degradation. The COD of the reverse osmosis concentrated water with lower biodegradability, which is obtained through reverse osmosis reusing treatment after standard biochemical treatment, is reduced from 70-200 milligrams per liter to below 50 milligrams per liter, so that the strictest local emission standards can be met.

Description

technical field [0001] The invention relates to a reverse osmosis concentrated water treatment method, in particular to a standard-reaching treatment method for reverse osmosis concentrated water generated in the process of sewage reuse. Background technique [0002] With the continuous development of my country's industrialization process, a large number of industrial pollutants have been discharged into the natural environment, bringing more and more serious pollution to natural water bodies. This pollution will not only increase the cost of human use of water resources, but also endanger The resulting water shortage has become an important factor restricting my country's economic and social development. Using advanced sewage reuse technology to recycle sewage after treatment can not only save a lot of water resources, but also greatly reduce the discharge of sewage. Therefore, the new technology of sewage reuse has attracted much attention and has been achieved after years...

AI Technical Summary

Problems solved by technology

Although the COD of the secondary biochemical effluent has reached the discharge standard of 50mg / L, due to its poor biodegradability, after physical concentration by ultrafiltration-reverse osmosis process, the biodegradability of reverse osmosis concentrated water is still very poor. The salt content of the water is relatively high, and the conductivity is usually above 5000μs. Conventional treatment methods cannot meet the most stringent emission standard of COD less than 50mg / L

The dosage of ozone in this invention is 120-145mg / L. The continuous and stable operation of the ozone generator and the cost of generating ozone are the problems that plague the current use of this technology.

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