Poorly performed backwash
reduces filter bed porosity because it does not fully remove the obstruction of pores by already adhered particles, causing increase in the pressure differential of the device and reduction of removal efficiency in the subsequent filtration process (Staden & Haarhoff, 2011).
In this survey, pool filter backwash
samples were collected at metro-Atlanta public pools during the 2012 summer swim season; qPCR assays were conducted to detect Escherichia coli (a fecal indicator), Pseudomonas aeruginosa, Cryptosporidium spp.
Key Words: Wetlands; Backwash
water; Secondary effluent; BOD5; TSS; Turbidity
therefore tends to contain more concentrated pathogens than does pool water.
Multimedia unit backwash
should be performed at a face velocity of about 2* 2 1/2 times the operating face velocity.
Also linked to the lower manifold is an arrangement of air laterals, which provide for media agitation during the backwash
The resulting report finds both types of auxiliary backwash
produces a cleaner media than the control filter, analyzes the annual costs of each system, and identifies site-specific capital cost factors for utilities to consider.
At 3,000 gpm, the sand system must backwash
as often as every three to five days.
Before performing the bucket test, make sure the backwash
control seals aren't leaking.
Work undertaken included the installation of ramps, wider doorways, a disabled toilet and a portable washbasin for clients who cannot use standard backwash
The new addition to the product line is the Maggie, a high intensity, in-line, self-cleaning magnetic separator that uses a patented process that shuttles the magnets outside the system flow at the time of backwash
to provide quick removal of debris.
water is pumped back upstream of the WWTP to achieve the highest possible overall water recovery for the plant.