System for recycling wastewater from circulating cooling water by adopting membrane process

Abstract

The invention discloses a system for recycling a wastewater from circulating cooling water by adopting a membrane process. The system comprises water treatment processes such as alkaline joint softening, ozone-biological active carbon, ultra-filtration, reverse osmosis and electrodialysis. Aiming at the water quality characteristics of the wastewater from circulating cooling water in a heat-engine plant, the process comprises the following steps: firstly, carrying out pretreatment on raw water by adopting the processes such as alkaline joint softening and ozone-biological active carbon treatment, and then adopting an ultra-filtration and reverse osmosis double-membrane treatment technology; entering reverse osmosis drainage into an electrodialysis device to concentrate; carrying out curing treatment on a little of electrodialysis strong brine. The alkaline joint softening and ozone-biological active carbon pretreatment technologies are adopted, so that the content of scaling components and refractory organics in water can be effectively reduced; the maximal reduction of wastewater with high salt content at the tail end is achieved by electrodialysis concentration. Therefore, the system has the characteristics of good operation stability, low pollution plugging of a reverse osmosis membrane, high overall recovery rate and the like.

Description

technical field [0001] The invention belongs to the technical field of sewage reuse, and in particular relates to a membrane recycling system for circulating water sewage. Background technique [0002] Circulating water sewage accounts for about 80% of the total wastewater in circulating cooling thermal power plants, which is the key to water saving and emission reduction in circulating cooling thermal power plants. The salinity, suspended solids, alkalinity, hardness and other contents of the circulating water are high, and in order to prevent corrosion and scale and control the growth of microorganisms, it is necessary to add chemical agents such as water stabilizers and bactericides. Therefore, the refractory organic matter in the circulating water The content is also higher. [0003] At present, the circulating water sewage treatment and reuse system that has been put into operation generally adopts the "coagulation clarification + membrane method (ultrafiltration - rev...

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Problems solved by technology

However, this treatment method does not effectively remove the scale-causing components and refractory organic matter in the circulating water sewage, and there is no disposal plan for the reverse osmosis concentrated water with a high salt content.

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