Method and system for high-efficiency recovery of high-salinity mine water

Abstract

The invention discloses a method and system for high-efficiency recovery of high-salinity mine water. The method comprises the following steps: removing colemanite, bicarbonate radicals and suspended solids by using a high-density clarifying pond to reduce reverse osmosis structure tendency; subjecting concentrated reverse osmosis water to chemical softening pretreatment to remove easily fouling components; and carrying out solid-liquid separation by using a tubular micro-filtration membrane and allowing separated liquid to enter into a concentrated water reverse osmosis unit. According to the invention, the concentrated reverse osmosis water undergoes chemical softening pretreatment to remove the easily fouling components, the tubular micro-filtration membrane is employed for solid-liquid separation, the separated liquid directly enters into the concentrated water reverse osmosis unit without treatment by other filtering units, so operation process flow is simplified, a land occupation area is reduced, designed flux is great, and a good effluent effect is obtained. The tubular micro-filtration membrane used in the invention is different from other micro-filtration or ultra-filtration membranes; the tubular micro-filtration membrane runs in a cross flow mode, water flow tangentially flows through the surface of the membrane at a high speed, thereby realizing scouring and cleaning of the membrane surface while carrying out filtering, and the membrane surface is hardly contaminated.

Description

Technical field [0001] The invention relates to a method and a system for efficiently recovering mine water with high salt content, and belongs to the technical field of mine water recovery. Background technique [0002] Mine drainage needs to be treated to meet the use and discharge requirements. The current national standards for mine water discharge include: "Water Quality Standard for Underground Fire Sprinklers in Coal Mines" GB50383-2006; "Water Standard for Imported Coal Mining Units in Underground Mines" DIN24320; Water Standard" GB50359-2005; "Industrial Water Quality Standard" GB / T19923-2005; "Drinking Water Hygiene Standard" GB6749-2006; "Purified Drinking Water Quality Standard" CJ94-2005; "Farmland Irrigation Water Quality Standard" GB5094-92 . The specific requirements are: 1) The mine water meets the production and domestic water needs of a coal mine / coal preparation plant after advanced treatment, and the salt content is less than 450mg / L (required by the owner);...

AI Technical Summary

Problems solved by technology

[0009] The object of the present invention is to provide a method and system for efficiently recovering mine water with high salinity, which can effectively solve the problems existing in the prior art, especially when the solid-liquid separation and subsequent treatment are carried out, the process flow is long and the investment is large , large area and high operating costs

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