Method and device for improving water quality of reclaimed water

Abstract

The invention provides a method and device for improving the water quality of reclaimed water. The method includes the following steps: (1) the to-be-treated reclaimed water is subjected to ozone oxidation treatment to obtain oxidized reclaimed water; and (2) the oxidized reclaimed water is subjected to electrodialytic treatment to obtain desalted reclaimed water and salt-rich reclaimed water. Themethod and device for improving the water quality of the reclaimed water is used for reclaimed water treatment in refinery enterprises by combining ozone oxidation and electrodialytic desalting processes, the COD, conductivity, alkalinity, hardness, chloride ion concentration, sulfate ion concentration and the like of the reclaimed water in the refinery enterprises are reduced, the problems of corrosion and scaling in the process of reclaimed water recycling for circulating water are relieved, and the concentration ratio of the circulating water in the refinery enterprises is increased.

Description

technical field [0001] The invention relates to a water treatment process, in particular to a method and device for improving the quality of reclaimed water, belonging to the technical field of water treatment. Background technique [0002] Reclaimed water is considered as an important non-drinking water resource and is gradually applied to industrial fields. It is an important measure to alleviate the shortage of water resources in my country and improve the efficiency of water use in my country by reusing reclaimed water instead of fresh water in the circulating cooling system. Many enterprises in our country use reclaimed water as the supplementary water of the circulating cooling system, and have achieved good results, achieving a win-win situation of environmental and economic benefits. [0003] Among them, the oily sewage of refining and chemical enterprises mainly includes low-concentration production sewage discharged from newly-built refinery units, ethylene units ...

AI Technical Summary

Problems solved by technology

The COD, conductivity, turbidity, iron ion, chloride ion and other water quality indicators of reclaimed water are higher than those of new water. After reclaimed water is reused as circulating water, the content of various impurities and soluble salts increases, the water quality deteriorates, and the sewage of the system The increase in the amount of water treatment chemicals and the increase in the use of water treatment chemicals will cause abnormal control indicators of circulating water and cause difficulties in the operation and management of circulating water

[0006] Second, increase the risk of corrosion and scaling in the circulating water system

After the reclaimed water reuses the circulating water, the corrosive and scaling ions in the system will increase, and the concentration will increase with the evaporation and concentration of the circulating water, which will increase the risk of corrosion and scaling in the system

In addition, the concentration of bacteria, inorganic salt ions and nutrients introduced by reclaimed water is gradually increasing. The suitable temperature, pH and sufficient dissolved oxygen of the circulating water system lead to the rapid growth and reproduction of microorganisms in the circulating water system, which is easy to cause system slime fouling, fouling

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