backwash

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backwash

The reversal of the direction of a usual pattern of flow.
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Keywords: Membrane bioreactor, Quorum quenching, Backwashing, Soluble EPS, Real wastewater.
[TSS.sub.ARi]--concentration of total suspended solids (mg [L.sup.-1]) present in a 60 mL sand sample from the filtering layer i, before backwashing or after filtration.
Backwashing cleans the filter to preserve water quality and also extends the life of the filter; however, backwashing too frequently can lead to degraded filter performance.
One final anecdote on backwashing: The Begerow staff has indicated that there is a resistance of the pads to molding.
This backwashing solution completely stops loss of sand during processing and there is never a need to replace the sand.
Unlike sand filters, there is no backwashing. When the filter powder becomes laden with collected dirt, the filter goes through a "bump" cycle.
This parameter is important in municipal drinking water applications due to the rigors of routine backwashing that may rapidly degrade a softer GAC.
The seven tubes that make up the ACCUFLUX media element have a combined surface area total of 791 square inches (5100 cm2), which capture more particulate matter to extend the time between required backwashing and increase productivity.
In an on-going drive to reduce the maintenance costs of their filters, Rosedale Products has developed a backwashing bag type fluid filter in which pressurised air can be released into the inside of the filter bag in the opposite direction to the normal filtering flow.
The sand is reseated back in place while still sending water out of the waste line, thereby reducing the chance of particulate blow-back to the pool when the valve is moved back to the filter position after backwashing.