Waste water treating process
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United States of America Patent
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Mar 24, 1992
Issued Date -
N/A
app pub date -
Dec 12, 1990
filing date -
Jul 31, 1987
priority date (Note) -
Expired
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Abstract
A waste water treatment process wherein an iron contactor or iron contact are immersed in a treatment tank, into which waste water flows. In the treatment tank sulfate reducing bacteria are made to coexist with activated sludge or biofilters, wherein a velocity of flow of agitating stream on the outer surfaces of said iron contactor or contactors is set at 10 to 20 cm/sec, under an aerobic treatment. Iron ions are made to elute from said iron contactor or contactors by utilizing electrochemical iron corrosion through the agency of oxygen concentration cells on the outer surfaces of said iron contactor or contactors on conditions that dissolved oxygen concentration in the treatment tank is 1 to 3.2 mg/l and the oxidation-reduction potential is -200 to -400 millivolts (mV). Under an anaerobic treatment, iron ions are made to elute by utilziing microorganism-corrosion on the outer surfaces of said iron contactor or contactors on condition that dissolved oxygen concentration in the treatment tank is 0 mg/l. Under the aerobic or anaerobic conditions, the iron ions eluting from the outer surfaces of said iron contactor or contactors are combined with ions of phosphoric acid in the waste water to thereby remove phosphorus in the waste water as insoluble salt of iron phosphate.
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