Method and system for concentrating high-salt mine well water

Abstract

The invention relates to a water treatment system, in particular to a method and a system for concentrating high-salt mine well water, and belongs to the technical field of coal mine water treatment.The method comprises the following steps: firstly, pretreating the high-salt mine well water to remove oil, suspended matters and colloid pollution factors; allowing effluent to enter a first-stage reverse osmosis system; feeding concentrated water of the first-stage reverse osmosis system to a first-stage hardness and silicon removal system to be subjected to hardness and silicon removal treatment; allowing effluent to enter a second-stage reverse osmosis system; feeding second-stage reverse osmosis concentrated water to a second-stage hardness and silicon removal system to be subjected to hardness and silicon removal treatment, and feeding effluent to an ED membrane system. The first-stage reverse osmosis system and the second-stage reverse osmosis system are both fed into a recycling water tank. According to the method, the recovery rate of the concentration section can reach 98%, the TDS of concentrated water after concentration can reach 150 g/L-200 g/L, compared with a conventional concentration mode, the method reduces the subsequent evaporative crystallization scale by 1/2-3/4, and the method has the advantages of being low in investment and low in operation cost.

Description

Technical field [0001] The invention relates to a water treatment system, in particular to a method and system for thickening high-salt mine water, and belongs to the technical field of coal mine water treatment. Background technique [0002] With the continuous extension of the coal industry chain, water demand for related industries has increased sharply, environmental pollution has increased, and coal mine environmental protection requirements have become higher and higher. Pollutants in coal mine water discharge are no longer restricted to oil, suspended matter, organic matter, etc. Conventional indicators, salt ions such as total dissolved solids, sulfate, chloride, and fluoride, have become new assessment indicators. The harm of high-salt wastewater to the environment is mainly manifested in the salinization of the soil, especially in the arid and semi-arid areas of the north or northwest, where the surface water resources are scarce, and the untreated high-salt mine water ...

AI Technical Summary

Problems solved by technology

The effect of membrane concentration treatment directly affects the investment, operation cost and system stability of the follow-up treatment system. At present, the commonly used concentration method is high-pressure reverse osmosis. The efficiency usually can only reach 40%~50%, resulting in large-scale follow-up processing system, high investment and high operating cost

High investment and operating costs restrict the treatment and utilization of high-salt mine water to a certain extent

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