Circulating water zero drainage separate recycling treating device and treating method thereof

Abstract

The invention relates to a circulating water zero drainage separate recycling treating device and a treating method thereof. The circulating water zero drainage separate recycling treating device comprises a circulating water collecting pool, a mixing device, a filter aid agent adding system, a filter unit, a sewage pool, a filter press, a nanofiltration device, a nanofiltration filtrate collecting tank, a nanofiltrationtrapped fluid collecting tank, an electrodialysis device, an electrodialysisconcentrated water collecting tank, an evaporative crystallization device and an electrochemical treating device. The treating method comprises the steps of firstly, adopting the technologies of chemical filter aid, precipitation, filter and the like to conduct turbid lowering and suspension removing pretreatment, then adopting a nanofiltration separate purification treatment technology to achieve salt separation treatment, concentrating and evaporating obtained filtrate to obtain sodium chloride solid, after conducting electrodialysis treatment on nanofiltered trapped fluid, producing recycled circulating water, and after conducting electrochemical rigidity lowering and sterilizing on strong brine, producing recycled water. The salt content of the circulating water can be effectively lowered, the problems of scaling and corrosion brought by too high ionic concentration of a circulatingwater system are solved, and meanwhile, efficient salt separation treatment and resource recycling are achieved.

Description

technical field [0001] The invention belongs to the technical field of circulating water treatment, and in particular relates to a treatment device and a treatment method thereof for zero-outflow, quality-separation and reuse of circulating water. Background technique [0002] The circulating water system is one of the indispensable energy media for the production of metallurgical, energy and chemical enterprises, and it is the device with the largest water consumption in industrial enterprises. At present, the supplementary water of circulating cooling water generally accounts for about 70% of the fresh water used in industry, and its water consumption is large and stable. Circulating water sewage is high-calcium, high-alkali, and high-salt wastewater, and it is an effective way for enterprises to save energy, reduce emissions, and reduce fresh water consumption. [0003] In the open circulating cooling water system, the circulating water is concentrated through the contin...

AI Technical Summary

Problems solved by technology

Fouling and slime deposits cause the heat transfer efficiency of the heat exchanger to decrease, and the energy consumption increases. In severe cases, it will be forced to stop production and damage the equipment

[0004] At present, most of the circulating water and sewage reuse treatment systems that have been put into use adopt the "coagulation clarification + double membrane" (ultrafiltration + reverse osmosis) treatment process, but the high-salt reverse osmosis concentrated water produced by this process is difficult to discharge directly. Difficulties in sewage treatment of various enterprises

Images