Treatment of wastewater through enhanced biological phosphorus r

Details Treatment of wastewater through enhanced biological phosphorus r Treatment of wastewater through enhanced biological phosphorus r

1993-08-17

1995-01-10

Wyse, Thomas

Liquid purification or separation

Processes

Treatment by living organism

210607, 210624, 210630, 210903, 210906, C02F 330

Patent

active

053804384

ABSTRACT:
Wastewater is treated by promoting the presence and growth of BPR organisms, which have the ability to absorb and retain an amount of phosphorus in excess of the amount required by the BPR organisms for metabolism and cell growth. In the process, a mixture of influent wastewater (10) and activated sludge (14) containing BPR organisms is first subjected to a period of incubation in an anoxic zone (20) followed by a period of incubation in an anaerobic zone (30). Volatile fatty acids (VFA's) (16) are added in the anaerobic zone (30). The mixture is then subjected to an aerobic zone (41). The wastewater mixture (46) leaving the aerobic zone is clarified in a clarifier (50), causing activated sludge to settle. The activated sludge contains BPR organisms which are engorged with phosphorus absorbed from the wastewater. The clarified wastewater (52) becomes effluent from the system. The activated sludge (54) is removed from the clarifier (50). A portion of the activated sludge, which contains some of the phosphorus-rich BPR organisms is wasted (56). The remainder of activated sludge (14) is returned to the system and mixed with influent wastewater (10) in the anoxic zone (20).

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William C. Boyle, Summary of Patented and Public Biological Phosphorus Removal Systems, Aug., 1991.

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