Membrane separation device composed of multiple groups of membrane module and its operating method

Abstract

A membrane separator with multiple membrane modules has at least two membrane modules. Each membrane module has the liquid inlet pipe connected to blowoff pipe and air supply pipe, the liquid outlet pipe connected with chemical cleaning reflux pipe, liquid supply pipe and back washing pipe, the circulating reflux pipe, and air releasing pipe. The connecting pipes are used for parallel connection between membrane modules. The working steps of said separator include working state, the first and the second washing state, blowoff state and final washing state of the first membrane module, continuous working state, and repeating said steps for other membrane modules sequentially.

Description

technical field [0001] The invention relates to a membrane separation technology, in particular to a membrane separation device with multiple sets of membrane modules and an operating method thereof. Background technique [0002] With the improvement of people's living standards, people's requirements for drinking water continue to increase, so-called pure water, space water or purified water has entered people's daily life. Moreover, production and industrial water, such as biochemical, pharmaceutical, food, seasoning and other fields, have higher and higher requirements for water purification. In recent years, people have developed microfiltration and ultrafiltration membrane technologies for water purification, which are meeting this need and have achieved good practical results. Among them, external pressure hollow fiber membranes are most widely used. This is because the external pressure hollow fiber membrane (hereinafter referred to as the membrane) has the largest ...

AI Technical Summary

Problems solved by technology

But it still has shortcomings: the external pipeline design of the membrane module in the membrane device is not perfect

However, in each cycle, as the membrane device is filtering, the membrane is gradually polluted, and the water production of the membrane device gradually decreases, that is, the water production is unstable; after automatic online cleaning, the water production of the membrane device becomes larger and the filtration pressure is low. Before online cleaning, the membrane device has less water production and higher filtration pressure

In use, in order to ensure a certain water production rate, it can only be set according to the water production rate before cleaning in each cycle, which will cause excessive water production of the membrane device after automatic online cleaning

At the same time, the water balance of the system is not good

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