C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 1/52 (2006.01) C02F 1/58 (2006.01) C02F 1/66 (2006.01)
Patent
CA 2532286
A method is provided herein for the lowering of the concentration of phosphorus in wastewater. The method includes the first step of adding a suitable amount of an aluminium-silicate composite coagulant to a supply of wastewater containing phosphates maintained at a pH of between about 4.5 to about 6.7 with or without the additional use of an inorganic acid, thereby to provide an eventual effluent stream of filterable flocs of aluminium phosphate which are dispersed in the treated wastewater. The method includes the second step of filtering the effluent stream of treated wastewater containing the filterable flocs of aluminium phosphate, to provide an effluent stream of water typically containing about 0.03 mg/l phosphorus to as low and lower than current detection limits for total phosphorous (i.e., commonly < 0.01 mg/l and as low as < 0.002 mg/l). The phosphorus removal is one of several steps of the physical-chemical and biological treatment of wastewater and occurs at a point of the process where sufficient treatment has already taken place (i.e., TSS and BOD concentrations have been reduced using physical-chemical and biological methods).
Miltons Ip/p.i.
Seprotech Systems Incorporated
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