Zero discharge treatment system of high salt wastewater

Abstract

The invention relates to a zero discharge treatment system of high salt wastewater. The zero discharge treatment system comprises a cycle pretreatment unit, a cycle reduction unit and a zero discharge unit, and is characterized in that the cycle pretreatment unit is used for discharging contributing water after reaction of the high salt wastewater and pretreatment agentia to the cycle reduction unit after the contributing water is filtered by a tube-type microstrainer, the cycle reduction unit performs preliminary reduction treatment on the contributing water treated by the cycle pretreatment unit by a reverse osmosis device, and performs deep concentration treatment by a multi-level electrically-driven ionic membrane device composed of at least one electrically-driven ionic membrane device, so as to further perform reduction to separate water in the high salt wastewater to a water tank of fresh water for reuse, a concentrated mixed salt solution obtained by deep concentration is discharged to the zero discharge unit, the zero discharge unit recycles nitrate and sodium salt in the concentrated mixed salt solution by heating, steaming and crystallizing the concentrated mixed salt solution. According to the zero discharge treatment system provided by the invention, the separated final mixed salt accounts for 5 percent or less than 5 percent of the total salt content, the contributing water is completely recycled, and zero discharge of wastewater is realized.

Description

technical field [0001] The invention relates to the field of zero-discharge treatment of high-salt wastewater, in particular to a zero-discharge treatment system of high-salt wastewater. Background technique [0002] In recent years, with the rapid development of petrochemical, electric power, metallurgy, coal chemical industry and other industries, the amount of reverse osmosis concentrated water, industrial sewage, recycled sewage and some process sewage produced in the industrial production process has increased year by year. The final disposal and utilization of these complex sewage has received extensive attention. [0003] At present, there are mainly the following methods for the treatment of high-salt and complex wastewater containing refractory organic matter: [0004] First, use strong oxidizing substances (mainly ozone, hydrogen peroxide, etc.) to catalyze and oxidize the refractory organic substances in the wastewater, so that the refractory organic substances i...

AI Technical Summary

Problems solved by technology

Although the patented technology achieves zero-discharge treatment of heavy metal wastewater with high salt content, the patent adopts the third solution, which has high treatment costs, consumes a large amount of steam during the treatment process, and only separates one kind of salt or directly forms a mixed Salt

The mixed salt needs special treatment as a hazardous waste, further increasing the cost

The investment cost and operating cost of this patented technology for the treatment of large volumes of high salt water are very high, and it is difficult for enterprises to accept and use it.

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