Multi-stage adjustable nanofiltration system and application of salt separation process

Abstract

The invention relates to a multistage adjustable nanofiltration system which comprises a raw water tank, a high-pressure pump, an activated carbon filter, a precision filter and a nanofiltration assembly which are sequentially connected in series, the nanofiltration assembly comprises at least four membrane elements which are connected in series, and produced water and concentrated water of the previous membrane element enter the next membrane element. The high-salinity wastewater treatment system is scientific and reasonable in design, the self-designed nanofiltration operation system is provided, the high-salinity wastewater is treated by using the system, process parameters are optimized, and high-efficiency nanofiltration separation of the high-salinity wastewater is realized. The nanofiltration salt separation system achieves the optimal salt separation effect under the operation conditions that the membrane flux is 20 LHM, the temperature is 20 DEG C, the recovery rate is 70% and the salt mixing ratio is 9: 1, and the mass concentration ratio of sodium chloride on the water production side reaches 99.51%.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to high-salt wastewater treatment technology, in particular to a multi-stage adjustable nanofiltration system and application of a salt separation process. Background technique [0002] With the increasing use of fresh water in my country and the increasing shortage of fresh water resources, combined with the current situation of high water consumption and high pollution in various chemical industries, the Ministry of Environmental Protection has put forward strict "zero discharge" requirements for various chemical industries in recent years. . For high-salt wastewater to achieve the goal of "zero discharge", the first step is to separate salt water, but if the various inorganic salts in high-salt wastewater cannot be separated, and finally through evaporative crystallization treatment, mixed salt crystals containing various ions will be obtained. Miscellaneous salts, as hazardous ...

AI Technical Summary

Problems solved by technology

However, most of the nanofiltration membrane salt separation technologies in the prior art use a single membrane, which is inefficient. The present invention applies for a nanofiltration operating system with four membranes to perform high-efficiency nanofiltration separation of high-salt wastewater

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