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What is the working principle of precipitation filtration in sewage treatment?

Jun 08, 2018


The purpose of sediment filtration is to remove particulate matter or colloidal substances from water sources.

These particles, if not removed, can cause damage or even water blockage to other sophisticated filtration membranes.

This is the oldest and most simple water purification method, so this step is commonly used in the preliminary processing of water purification, or when necessary, will also join a few more in the line filter (filter) to remove bulky material.

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There are many types of filters used in the filtration of suspended particulate matter, such as mesh filters, sand filters (such as quartz sand, etc.) or membranous filters.

As long as the particle size is larger than the hole size, it will be blocked.

For ions dissolved in water, they cannot be stopped.

If the filter is not replaced or cleaned for too long, the particles accumulated in the filter will become more and more, and the water flow and water pressure will gradually decrease.

People use water pressure and pressure difference to determine the extent of the filter.

Therefore, the filter should be periodically reversed to remove impurities from the stack, and the filter should be replaced at a fixed time.

Sediment filter method, there is a problem worthy of attention, because of the particulate matter has been blocked and accumulation, these substances may have bacteria in the breeding, and the release of toxic substances through the filter, cause the pyrogen reaction, so often want to change the filter, principle of inlet and outlet pressure drop increased to five times the original, will need to replace filter.

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