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

Abstract

A membrane separation device with multiple sets of membrane modules and its operating method. At least two sets of membrane modules are provided, and each set of membrane modules is connected with a liquid inflow pipeline, a liquid outflow pipeline, a circulation return pipeline, and a vent pipeline. Among them, the liquid inflow pipeline is also connected with the sewage pipeline and the air supply pipeline, and the liquid outflow pipeline is also connected with the chemical cleaning return pipeline, the liquid supply pipeline and the backwash pipeline; the membrane module between the groups The connecting pipelines are connected in parallel; the first flow sensor is set on the liquid supply pipeline for automatic control of constant water production. The working steps of the separation device are: the working state, the first cleaning state of the first set of membrane components, the second cleaning state of the first set of membrane components, the blowdown state of the first set of membrane components, after the cleaning of the first set of membrane components, Continue to work, and clean the second set of membrane components. The steps are the same as those for the first set of membrane components. After the second set of membrane components are cleaned, clean the other sets.

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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