C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/63
C02F 3/06 (2006.01) B01D 24/22 (2006.01) B01D 29/11 (2006.01) B01D 35/143 (2006.01) B01D 36/02 (2006.01) B01D 37/03 (2006.01) C02F 1/50 (2006.01)
Patent
CA 1334222
A process and apparatus for protecting a medium bed filter with underlying support screen from solids contained in a liquid, such as filtrate from the filter, used to regenerate or backwash the medium bed filter. Filtrate enters a first collection chamber containing a screen assembly covering one outlet, the chamber also containing a second outlet. Filtrate traverses the screen assembly and is transferred to a second collection chamber with addition of a predetermined amount of bactericide to prevent solids growth therein. Upon bactericide- treated filtrate reaching a predetermined level within the second chamber, filtrate in the first chamber bypasses the screen assembly and flows out the second outlet to further biological treatment or use. Bactericide-treated filtrate from the second collection chamber is used to regenerate or backwash the medium bed filter with addition of optional surfactant to assist in cleaning the filter medium and underlying support screen. The first collection chamber has an alarm system which detect resistance of filtrate flow traversing the screen assembly and warns that the screen assembly requires cleaning or replacement, thus fully protecting the support screen from solids.
592850
Macrae & Co.
Zimpro/passavant Inc.
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