Concentration reduction method and concentration reduction device for reverse osmosis concentrated water

Abstract

The invention discloses a reverse osmosis concentrated water concentration reduction method. The method comprises the following steps: detecting the inlet water quality of reverse osmosis concentratedwater, directly entering a next step when the water quality of the reverse osmosis concentrated water meets the standard, otherwise, pretreating the reverse osmosis concentrated water, and then entering the next step; carrying out multiple times of circulating concentration on the reverse osmosis concentrated water, and heating the reverse osmosis concentrated water and then carrying out pervaporation during each time of concentration; concentrating the reverse osmosis concentrated water for multiple times to obtain a secondary concentrated solution, and entering the next step; and carrying out MVR multi-effect evaporation on the secondary concentrated solution to obtain fresh water and inorganic salt crystals. The method has the characteristics of large application range, low treatment cost and good treatment effect.

Description

technical field [0001] The invention relates to a concentration treatment method and device for reverse osmosis concentrated water, in particular to a concentration reduction method and concentration reduction device for reverse osmosis concentrated water. Background technique [0002] Reverse osmosis technology is a membrane technology, initially only used for seawater desalination, and later widely used in drinking water production and advanced wastewater treatment in recent years. This technology has the advantages of membrane technology, such as modular structure, low energy consumption, simple operation and so on. However, when the reverse osmosis process is used for advanced treatment of wastewater, water molecules pass through the reverse osmosis membrane, and the reverse osmosis membrane has a good interception effect on various organic substances and inorganic salts in the water body. While obtaining clean water, it will produce 25-35% concentrated water. This con...

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Problems solved by technology

However, the evaporator will also be corroded and scaled by the secondary concentrate during treatment, which reduces the stability of the process and requires the concentration of pollutants in the secondary concentrate

At the same time, the process is limited by high operating costs, especially in the case of large water volumes, and the economy limits the feasibility of its practical application

Therefore, the existing concentrated treatment methods for reverse osmosis concentrated water have the problems of small application range, high treatment cost and poor treatment effect.

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