A treatment system for high-salt waste water

Abstract

The invention relates to a treatment system for high-salt waste water, and belongs to water treatment techniques. The treatment system comprises an adjusting tank, a high-density sedimentation tank, a V-type filter tank, a first-section ion exchange resin system, an ultrafiltration system, a first-section reverse osmosis system, a second-section ion exchange resin system, a high-pressure nanofiltration system, a second-section reverse osmosis system, a high-pressure flat sheet membrane system and an MVR system in order. The high-pressure nanofiltration system, the high-pressure flat sheet membrane system and a freezing crystallization system are connected in order. The ultrafiltration system is connected to the high-density sedimentation tank. The treatment system reasonably coupling ultrafiltration, nanofiltration, reverse osmosis and a high-pressure flat sheet membrane method and combining MVR crystallization and freezing crystallization techniques is adopted to treatment of the high-salt waste water, and is low in cost, low in running cost, free of secondary pollution, safe, compact in structure, small in occupied space and high in economic value.

Description

technical field [0001] The invention belongs to water treatment technology, and relates to a high-efficiency separation, concentration and crystallization technology of salt in industrial high-salt waste water, which can effectively realize resource utilization of high-salt waste water. Background technique: [0002] Wastewater discharged during industrial production often contains high concentrations of inorganic salts, such as calcium and magnesium ions, chloride ions, sodium ions, and sulfate ions. These inorganic salts may be by-products of inorganic salts in the chemical production process or to adjust the acid-base neutralization of the solution A large number of inorganic salts are produced. If these high-salt wastewater is discharged directly, it will lead to an increase in the salinity of river water, which will inevitably cause serious pollution to surface water, groundwater, soil, aquatic organisms, etc., which will directly endanger our human health and living en...

AI Technical Summary

Problems solved by technology

However, multi-effect evaporation uses saturated steam. Due to the strengthening of environmental protection monitoring by the government and the rise in steam prices, it is becoming more and more difficult to use evaporation to treat high-salt wastewater.

Moreover, the evaporated salt is a mixture of various salts, most of the sodium sulfate salt still exists in the wastewater, and it is difficult to recycle the treated wastewater

When biological methods are used to treat high-salt wastewater, inorganic salts have a significant inhibitory effect on them, making it very difficult to treat high-salt wastewater with microbial methods.

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