Seawater desalination concentrated water comprehensive utilization system and method thereof

Abstract

The invention belongs to a water treatment technology, and particularly relates to a seawater desalination concentrated water comprehensive utilization system and a method thereof. The seawater desalination concentrated water comprehensive utilization system comprises a heat exchanger, a heater, a stirring tank, a clarification tank I, a centrifugal separator, a filter I, a security filter, a nanofiltration device, a dissolving tank, a clarification tank II and an evaporative crystallization device. The invention also provides the seawater desalination concentrated water comprehensive utilization method by using the seawater desalination concentrated water comprehensive utilization system. According to the method, the high-temperature sodium chloride saturated solution and the potassium sulfate solid which can be directly used for the alkali preparation process are prepared at the same time, and the requirements of seawater heating to prepare double salt and further obtain potassium sulfate are met through one-time heating, so that the high-temperature saturated sodium chloride solution is obtained, the nanofiltration device is protected, and the energy consumption of subsequent multiple process steps for preparing alkalized salt is improved.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a comprehensive utilization system and method for seawater desalination concentrated water. Background technique [0002] As the main technology to deal with the water resource crisis, seawater desalination technology has made great progress, and with the maturity of the technology, some processes have begun to focus on the extraction of high value-added salt in the process of seawater desalination, the most typical of which is the emergence of some in recent years. Technology for extracting potassium sulfate in seawater desalination. However, there are still a large number of existing processes that do not realize the extraction of potassium sulfate in the seawater desalination process, and potassium ions exist in the concentrated water after seawater desalination and are discharged to waste. [0003] On the other hand, the main component of desalinated concentrated w...

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Problems solved by technology

However, there are still a large number of existing processes that have not realized the extraction of potassium sulfate in the seawater desalination process, and potassium ions exist in the concentrated water after seawater desalination and are discharged to waste

[0003] On the other hand, the main component of seawater desalination concentrated water is sodium chloride. The existing treatment methods basically aim at producing solid salt, that is, separating brine, but the energy consumption is huge

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