High-efficiency double-film seawater desalination system

Abstract

The invention discloses a high-efficiency double-film seawater desalination system. The system comprises a water taking device, a water taking pump, an air floatation tank, a filter tank, a clear water tank, a lifting pump, a security filter, a high-pressure pump, a booster pump, an energy recovery device, a first-stage reverse osmosis device, a second-stage high-pressure pump, a second-stage reverse osmosis device, a mineralization filter, a water producing tank and a water producing pump. The system has the advantages that when the system works, the air floatation tank and the filter tank are adopted as a seawater desalination pretreatment process, and floating oil, algae and plankton in seawater can be effectively removed by utilizing the operation characteristics of the air floatation tank; microorganisms and bacteria in the seawater are adsorbed by utilizing the characteristic of multiple filter materials in the filter tank, so that substances such as plankton and spores in the seawater are further reduced; and meanwhile, compared with a traditional ultrafiltration process, the pretreatment process has the characteristics of low investment and convenience in operation and maintenance, and has very good economic benefits for large and medium-sized seawater desalination.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a high-efficiency double-membrane seawater desalination system. Background technique [0002] Among the 55 coastal prefecture-level and above cities in 11 coastal provinces (autonomous regions, municipalities) in China, 51 are water-deficient cities, and all 12 island counties are water-deficient counties. It can be said that water resources have become the bottleneck of economic and social development in coastal areas. Therefore, seawater desalination, as an important high-quality incremental water source, is of great significance to alleviate the shortage of water resources in coastal areas and ensure water security. [0003] At present, my country has built 123 seawater desalination projects, and the total national seawater desalination capacity is about 1.65 million tons per day. The "Action Plan for the Development of Seawater Desalination Utilization" proposes tha...

AI Technical Summary

Problems solved by technology

[0004] Due to the late start of the seawater desalination industry in my country, there has been no major breakthrough in the volume of the seawater desalination projects that have been built in China, resulting in the high cost of seawater desalination per ton of water

At the same time, in the seawater desalination plants currently built in my country, the pretreatment process mostly adopts ultrafiltration, resulting in high investment and complicated operation and maintenance of seawater desalination plants

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