Treatment technique for recycling waste water into industrial ultrapure water

Abstract

The invention discloses a treatment technique for recycling waste water into industrial ultrapure water, which comprises the following steps of: pretreatment, preposed activated carbon adsorption, first-stage reverse osmosis, post-positioned activated carbon adsorption, second-stage reverse osmosis and electro-deionization. After post-positioned activated carbon treated by reverse osmosis is absorbed for saturation, the post-positioned activated carbon can be repeatedly used for preposed activated carbon adsorption by simple operation. The treatment technique can be used for treating the waste water which is rich in organic cleaning agent and heavy metal ions into the ultrapure water with qualified TOC, ensures equipment to run stably, has the advantages of being simple, high-efficiency, stable and low in cost, has the water reuse rate of more than 60%, and can be widely applied to waste water treatment of industries such as electronics, semiconductor and the like which use a great deal of ultrapure water as well as waste water treatment of urban recycling water used for supplying water for boiler in the power plant.

Description

technical field [0001] The invention relates to the field of water, waste water or sewage treatment, in particular to a treatment process for recycling waste water into industrial ultrapure water. Background technique [0002] my country's water resources are extremely scarce, and saving water resources has great strategic significance. The development of circular economy is of great significance to improving resource utilization and building a resource-saving and environment-friendly society. [0003] Industrial fields such as electronics, semiconductors, solar photovoltaics, and coated glass require a large amount of ultrapure water for cleaning and dispensing, and the dosage is usually 10-150M 3 / h, the water quality requirement is 10MΩ.cm-18.2MΩ.cm. At present, most of the raw water produced by industrial ultrapure water uses urban tap water, and the mainstream production process is reverse osmosis plus mixed bed ion exchange integrated process. The cleaning water of ...

AI Technical Summary

Problems solved by technology

On the other hand, reverse osmosis membrane technology does not have a high rejection rate for organic matter below 100 molecular weight, especially organic solvents are more difficult and may even be destroyed. Ultra-pure water quality is affected by the heavy load of ultraviolet light

Therefore, industrial wastewater or urban reclaimed water is reused as ultra-pure water through reverse osmosis plus electrical deionization cleaning production technology. It is necessary to optimize the process design to solve the problem of excessive organic matter, heavy metal ions, hardness, and salt affecting ultra-pure water quality, membrane pollution and Device stability issues

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