Novel sewage sub-zero discharge treatment method and novel sewage sub-zero discharge treatment device

Abstract

The invention relates to a novel sewage sub-zero discharge treatment method and a novel sewage sub-zero discharge treatment device. The treatment method comprises the following steps of: (1) chemical-membrane filtration treatment, namely rapidly transmitting pre-treated sludge which is added with proper amounts of a precipitant and a crystallization aggregating agent, transmitting the sludge in a slow mixer, adding to a precipitator, implementing precipitation and separation, and timely discharging sludge on the bottom; lifting sewage in the precipitator to a tubular ultrafiltration membrane device through a circulating pump, and implementing cross-flow membrane filtration to the chemically treated sewage through the tubular ultrafiltration membrane; transmitting filtered water to a pH regulator and regulating pH value to 8-10; (2) high-concentration reverse osmosis treatment, namely transmitting the filter water with pH value regulated to a cartridge filter through a reverse osmosis water feeding lifting pump, and transmitting the water to a reverse osmosis membrane component through a reverse osmosis high-pressure pump and implementing reverse osmosis desalting treatment, to obtain reverse osmosis produced water and reverse osmosis concentrated water. The treatment method simultaneously improves reverse osmosis pretreatment and reverse osmosis design, so that the recovery rate of reverse osmosis is 90-95%.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a novel sewage treatment method and a device thereof, in particular to a novel sewage sub-zero discharge treatment method and a device used in the method. Background technique [0002] Water resources are very important and extremely precious natural resources for human beings. With the development of modern industry and the improvement of people's living standards, there are more and more industrial wastewater and domestic sewage, and water resources are becoming more and more scarce. With the increasing importance of environmental protection and stricter industrial wastewater discharge standards, water treatment technology has been paid more and more attention. [0003] Reverse osmosis (RO) was first researched in the United States in the early 1950s to solve the problem of seawater desalination. Today, it has been widely used in water treatment. Seawater desalination,...

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Problems solved by technology

[0008] However, the so-called "zero emission" is based on complex technology and a large amount of investment. It can be realized purely from a technical point of view, but it is not "economical" from an economic point of view, which seriously restricts its industrial application.

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