Industrial ultrafiltration membrane device pollutant online extraction and analysis method

Abstract

The invention relates to an industrial ultrafiltration membrane device pollutant online extraction and analysis method. The invention belongs to the field of membrane-method sewage deep processing and recycling method. The method comprises the steps that: (1) an ultrafiltration membrane with a relatively compact skin structure is used for manufacturing a lateral line membrane assembly; (2) the lateral line membrane assembly is connected in parallel into an industrial ultrafiltration membrane device; and inlet water membrane-surface flow velocity at the lateral line assembly is controlled at 0-8m / s; (3) during an operation process, lateral line membrane assembly water production variation is recorded with timed frequency; when water production is reduced by 50-95% relative to an initial water production, the polluted lateral line membrane assembly is fetched; part of polluted ultrafiltration membrane is fetched and is subjected to low-temperature bake-drying; and membrane-surface pollutant observation and analysis are carried out; and (5) acid and alkali are respectively used for soaking and washing the polluted ultrafiltration membrane, and contents of specific pollutants in the washing liquid are detected. When the method provided by the invention is used in washing the polluted ultrafiltration membrane, water production of the washed polluted ultrafiltration membrane can be restored to higher than 95% of that of the initial water production.

Description

technical field [0001] The invention belongs to the field of advanced treatment and reuse of sewage by membrane method, relates to an online extraction and analysis method of pollutants in the application process of industrial ultrafiltration membrane devices, and more specifically relates to a method for moderate treatment and reuse of membrane pollutants in sewage by membrane method On-line extraction, identification and pollutant cleaning methods. Background technique [0002] Ultrafiltration is one of the important membrane separation technologies. It has been widely used in energy, environmental protection, electronics, medicine, food and other fields. Compared with conventional separation methods, ultrafiltration has low energy consumption, high efficiency, simple process, and does not pollute the environment. It is an important technology to solve contemporary energy, resource and environmental problems. However, since ultrafiltration membranes are easily polluted by...

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Problems solved by technology

[0008] In view of the technical information related to pollutants on the ultrafiltration membrane surface during the operation of industrial membrane devices, which cannot be quickly obtained, the acquisition of pollutants needs to be at the expense of the destruction of the entire ultrafiltration membrane module, and the technical problems in the analysis of pollutants on the ultrafiltration membrane surface , the present invention provides an online extraction and analysis method for pollutants on the surface of industrial ultrafiltration membranes, which can not only realize the rapid, true and objective extraction process of pollutants on the surface of ultrafiltration membranes during the operation of industrial membrane devices, but also through the analysis of appropriate analysis methods Combination, and then can grasp the relevant technical information of ultrafiltration membrane surface pollutants in more detail, on this basis, can provide key data reference and basis for the selection and optimization of cleaning process of industrial ultrafiltration membrane modules with serious pollution

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