Integrated-membrane seawater desalination and strong brine comprehensive utilization system

Abstract

The invention discloses an integrated-membrane seawater desalination and strong brine comprehensive utilization system comprising a seawater desalination device and a concentration device which are connected through a pipeline; the seawater desalination device comprises a reverse osmosis pretreatment device, a primary reverse osmosis device and a desalination water tank which are connected through pipelines; the concentration device comprises a primary nanofiltration device, a secondary nanofiltration device and an MVR crystallizer; a water outlet of strong brine of the primary reverse osmosis device is connected with a water inlet of the primary nanofiltration device; a water outlet of concentrated water of the primary nanofiltration device is connected with a water inlet of the MVR crystallizer; a water outlet of filtered water of the primary nanofiltration device is connected with a water inlet of the secondary nanofiltration device; a water outlet of filtered water of the secondary nanofiltration device is connected with a water inlet of the primary reverse osmosis device; a water outlet of concentrated water of the secondary nanofiltration device is connected with the water inlet of the MVR crystallizer. The system can realize zero discharge and extraction of chemical products, synthetically applies energy consumption during filtration, and reduces the comprehensive operation cost.

Description

technical field [0001] The invention relates to the field of seawater desalination, in particular to a full-membrane seawater desalination and concentrated brine comprehensive utilization system. Background technique [0002] In recent years, my country's seawater desalination industry has developed rapidly, which has alleviated the growing shortage of water resources in some areas of my country to a certain extent. However, with the continuous development of the seawater desalination industry, more and more people pay more and more attention to the problem of desalination by-product concentrated brine discharge. At present, most of the desalinated concentrated brine is directly discharged into the ocean, because the salt content of concentrated brine is 1 higher than that of seawater. ~3 times, direct discharge into the sea will cause great pollution to the ocean and cause certain damage to the local marine ecology. The use of salt pans to make salt in the sun also restric...

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Problems solved by technology

However, the current concentration process of brine needs to consume a lot of energy, which seriously restricts the utilization of brine

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