A prefilter with certain filtration accuracy must be configured before the ultrafiltration system to prevent large particles from entering the ultrafiltration membrane module and blocking the membrane wire and filtration channel, or even causing scratch and damage to the membrane wire. The internal pressure ultrafiltration membrane is required to be equipped with a prefilter with a filtration accuracy of less than 150um. There are many options for the form of filter.
2. Pre dosing system
Before the ultrafiltration system, flocculant and bactericide can be added according to the specific water source. Generally speaking, the addition of flocculant contributes to the formation of filter cake layer on the membrane surface, prevents deep pollution on the membrane surface and micropores, and it is easy to clean pollutants out of the membrane system during backwashing; The dosing type and dosage are determined according to the parameters such as turbidity and pH of water source. The addition of bactericide can effectively prevent biological pollution and reduce organic pollution. At the same time, it can keep a certain amount of bactericide surplus in ultrafiltration water production, which can inhibit secondary pollution in pipelines and water tanks.
3. Backwashing system and production water tank
The ultrafiltration system must be equipped with a backwashing system to regularly remove the trapped pollutants and restore the filtration performance of the ultrafiltration membrane system. The backwashing system is composed of production water tank, backwashing pump, pipeline, valve and dosing system. The backwashing process is completed by automatic control program. Ultrafiltration backwashing is generally divided into water backwashing and dosing backwashing. Bactericide, acid and alkali can be added for dosing backwashing, and the optimized configuration can be selected according to the different water quality of water source. Backwashing dosing is one of the membrane performance recovery methods that must be used in ultrafiltration system. It can greatly prolong the cycle of shutdown chemical cleaning.
4. Chemical cleaning system
The chemical cleaning system is generally composed of cleaning water tank, cleaning pump, filter and mixing and heating equipment. When the ultrafiltration is seriously polluted or the membrane pressure difference has reached the specified limit, and the dosing backwashing can no longer restore the performance of the ultrafiltration system, shutdown chemical cleaning is required. The chemical cleaning system is generally controlled by manual valves.
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