Power plant sewage treatment method

Abstract

The invention discloses a power plant sewage treatment method. The treatment method comprises pretreatment, reverse osmosis treatment, sedimentation treatment and membrane crystallization treatment. The method comprises the following steps: carrying out pretreatment on the sewage of the power plant, and then enabling the pretreated sewage of the power plant to enter a reverse osmosis device for reverse osmosis treatment to obtain a first clear solution and a concentrated solution; enabling the first clear liquid to enter a membrane crystallization device, carrying out membrane crystallization treatment at 5-40 DEG C to obtain solid salt crystal particles on one side of a membrane, and obtaining purified water on the other side of the membrane; enabling the concentrated solution to enter a sedimentation tank for sedimentation treatment to obtain a second clear solution and slurry, leading the slurry out of the system, mixing the second clear solution with the first clear solution, and enabling the mixture to enter the membrane crystallization device for membrane crystallization treatment. According to the embodiment of the invention, the scale inhibitor is not used, so that medicament cost is saved; pure physical water treatment is adopted, and environmental benefits are good. The invention is suitable for sewage treatment of power plants.

Description

technical field [0001] The invention belongs to the field of sewage treatment in power plants, and in particular relates to a treatment method for sewage in power plants. Background technique [0002] Water resources are basic natural resources and strategic economic resources, and are an important foundation for sustainable social and economic development and maintaining ecological balance and a harmonious environment. The electric power industry is the basic industry of the national economy and an important energy industry. In the total installed capacity of power generation in the country, thermal power generation accounts for more than 70%, and the water consumption of thermal power generation accounts for 40% of all industrial water consumption. Due to the large water consumption of thermal power plants, sewage from power plants Disposal issues have become an important factor restricting the development of the power industry, and how to realize low-cost and environmenta...

AI Technical Summary

Problems solved by technology

[0003] The existing power plant sewage treatment process has many steps and complicated operation, and antiscalants are usually added to the system to prevent scaling

In these processes, a large number of chemical agents such as flocculants and scale inhibitors are used. On the one hand, the cost of water treatment remains high, and on the other hand, the discharge of concentrated water causes great pollution to the environment.

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