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Recently, the Qingdao Municipal Government is planning the development plan of desalination equipment, aiming to achieve output of more than 2 billion yuan by 2015, accounting for 25% of the domestic market share of desalination equipment. To vigorously develop desalination and direct use of seawater is of strategic significance for the long-term treatment of water shortage of water resources for water equipment in China's electronics industry. We need fresh water from the sea, which is inexhaustible, free from the influence of time, space and climate, and has good water quality and stable water supply. With the progress of science and technology, the cost of desalination will decrease, which is close to the quotation of tap water. Seawater desalination skills, low multi-effect distillation and reverse immersion membrane are the future directions. At present, there are more than 20 desalination skills in the world, including reverse immersion, low-efficiency, multi-stage desalination equipment flash, electrodialysis, pressure vapor distillation, dew point transpiration, hydroelectric co-generation, hot film co-generation and the use of nuclear, solar, wind and tidal desalination skills, as well as microfiltration, ultrafiltration and nanofiltration. A variety of pre-disposal and Post-disposal skills. In terms of big classification, there are two main categories: distillation (thermal method) and membrane method. Among them, low multi-effect distillation, multi-stage flash evaporation and reverse immersion membrane method are the global mainstream skills. Low multi-efficiency has the advantages of energy saving, low demand for Seawater Pretreatment and high quality of desalinated water. Reverse immersion membrane process has the advantages of low investment and low energy consumption, but high demand for seawater pretreatment. The multi-stage flash evaporation method has the advantages of sophisticated skills, reliable operation and large equipment output, but its energy consumption is high. Low multi-effect distillation and reverse immersion membrane are the future directions.

Author: Hangzhou Water Shield Technology Co., Ltd.

Website: http://www.zjhzsd.com/

Key words: water equipment in electronic industry, desalination equipment