Industrial wastewater recovery method and wastewater recovery system

Abstract

eps: S10, reducing the hardness of wastewater in a settling pond; S30, filtering wastewater with hardness by a filter device and ultra-filtering the filtered wastewater by an ultrafiltration device to remove suspended solids, particles and coeps: S10, reducing the hardness of wastewater in a settling pond; S30, filtering wastewater with hardness by a filter device and ultra-filtering the filtered wastewater by an ultrafiltration device to remove suspended solids, particles and colloids in the wastewater; S50, carrying out ion exchange for the ultra-filtered wastewater by an ion exchange device to obtain a permeable liquid; S80, carrying out reverse osmosis on the permeable liquid by a reverse osmosis to obtain a penetrating fluid; S90, collecting the penetrating fluid by virtue of a water tank. The wastewater recovery method provided by the invention ensures that the reverse osmosis device can be continuously and stably operated with high recovery rate, thereby guaranteeing the wastewater recovery amount.

Description

technical field [0001] The invention relates to the technical field of waste water recovery, in particular to a method for recovering industrial waste water and a waste water recovery system. Background technique [0002] Coal chemical industry saline wastewater mainly comes from the coal gas washing wastewater in the production process, the drainage of the circulating water system, the drainage of the chemical water station, etc., and sometimes the organic wastewater after biochemical treatment. Concentration and enrichment by dosing make the discharged wastewater have the characteristics of high salt content. The pollutants are mainly total salt content (TDS), and some wastewater also contains refractory organic matter. [0003] With the development of the coal chemical industry and the improvement of environmental protection requirements, production enterprises pay more and more attention to the control of production wastewater. Many areas not only require the discharge o...

AI Technical Summary

Problems solved by technology

Thermal concentration technology is evaporative crystallization, which has the characteristics of high concentration multiples, but the general investment and operating costs are high. It is generally used in the treatment of high-salt wastewater with small water volume and TDS above 10,000mg / l, and it is mostly applied after membrane concentration. ; Ion exchange method, electrodialysis method and EDI method have low water recovery rate, about 50-60%, and high operating cost; compared with them, membrane separation method has the characteristics of low processing cost, large scale and mature technology

[0005] The Chinese patent application whose publication number is CN101798150A discloses a treatment method and a treatment device for high-salt wastewater, which includes lime clarification tanks, filters, ion exchangers, carbon removers, reverse osmosis and other treatment processes, but the method The impact resistance is poor. When the inflow water volume and water quality fluctuate greatly, the system cannot maintain a certain stability, and the follow-up is a reverse osmosis membrane, which makes it difficult for the system yield to reach the expected target, and the membrane pressure is high. The above problems make It is more difficult to use in the factory

[0006] The Chinese patent with publication number CN1151862C discloses a reverse osmosis method and equipment for high-efficiency operation, which includes reverse osmosis membrane, mixed bed ion exchange device, micro filter, ultraviolet disinfection device, decarburization device, electric ionization device, etc. , but this method requires the pH value of the system to be controlled above 10.5. Due to the alkalinity of incoming water, organic matter and the volatility of various ions, it is difficult to control the system at a predetermined high pH. Once the pH drops, membrane fouling will occur. risk, it is difficult to operate when the project is running

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