A kind of antiscaling method of membrane filtration concentrate

Abstract

The invention provides a method for preventing membrane filtration concentrated liquid from being scaled. The method comprises the following steps: pumping and mixing acid-added membrane filtration concentrated liquid by virtue of a first static mixer, enabling the mixed membrane filtration concentrated liquid to tangentially enter a degassing tank for performing vapor-liquid separation, wherein the membrane filtration concentrated liquid stay in the degassing tank for 0.5-3 hours, enabling the produced gas to pass through a mist-eliminating dehydration device, extracting and discharging; pumping the degassed membrane filtration concentrated liquid, adding alkali and mixing by virtue of a second static mixer, adjusting backwards the pH value and finally feeding to a subsequent treatment system. The method has the advantages of simple operation and small chemical agent consumption; by the anti-scaling method, the problem of scaling of the membrane filtration concentrated liquid can be effectively solved and the efficient and stable operation of the subsequent treatment system is ensured.

Description

【Technical field】 [0001] The invention relates to an antiscaling method for membrane filtration concentrated liquid. 【Background technique】 [0002] With the promulgation and implementation of the new national standard "Pollution Control Labeling of Domestic Garbage Landfill Sites" GB16889-2008, in order to meet higher effluent requirements, most domestic leachate treatments currently use nanofiltration or reverse osmosis as advanced treatment How to efficiently treat the membrane filtration concentrate in the landfill leachate treatment process is an urgent problem to be solved at present. Nanofiltration can intercept non-biodegradable and difficult-to-biodegradable macromolecular organic substances, and the interception of monovalent salt is very small. Most of the salt is discharged with the clear liquid, avoiding the enrichment of salt in the system, and the operating pressure is relatively low. The separation level of reverse osmosis can reach the ion level, which can ...

AI Technical Summary

Problems solved by technology

These methods cannot be popularized and applied, and the easy fouling of the membrane filter concentrate is one of the main reasons.

The traditional descaling method mainly uses the method of adding alkali to remove calcium and magnesium ions. Due to the large consumption of chemicals, it is difficult to precipitate, it occupies a large area, it is labor intensive, and it is difficult to operate, which limits its popularization and application.

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