초록 ▼

A process and an apparatus for treating waste water in oxidations ponds, oxidation ditches, or other bodies of water in a waste water treatment facility to abate the malodors caused by the presence of volatile contaminants. In the process, a water stream is withdrawn from the body of waste water and

A process and an apparatus for treating waste water in oxidations ponds, oxidation ditches, or other bodies of water in a waste water treatment facility to abate the malodors caused by the presence of volatile contaminants. In the process, a water stream is withdrawn from the body of waste water and contacted with an air stream in an air-water contact apparatus. The water stream is thereby aerated and stripped of potentially odor causing volatile contaminants and an off-gas stream is produced containing the stripped volatile contaminants. At least a portion of the aerated and stripped water stream is returned to the body of waste water to inhibit anaerobic decomposition of organic impurities. The off-gas stream is passed through a fixed bed type biofilter comprising a porous filter bed provided with appropriate microorganisms so that the volatile contaminants in the off-gas stream come into contact with the microorganisms and are biologically metabolized into environmentally innocuous substances rather than being emitted into the ambient air.

대표청구항 ▼

An apparatus for treating a body of waste water containing volatile contaminants and a microbial population for the biodegradation of the volatile contaminants the apparatus comprising: an air-water contact apparatus for intimately contacting a water stream from the body of waste water with an air s

An apparatus for treating a body of waste water containing volatile contaminants and a microbial population for the biodegradation of the volatile contaminants the apparatus comprising: an air-water contact apparatus for intimately contacting a water stream from the body of waste water with an air stream to produce a water stream which has been aerated and an off-gas stream containing the volatile contaminants, the air-water contact apparatus comprising a liquid outlet for the aerated water stream and a gas outlet for the off-gas stream; a return conduit for returning at least a portion of the aerated water stream to the body of waste water, said return conduit being in fluid communication with said liquid outlet of the air-water contact apparatus and said body of waste water; a fixed bed type biofilter comprising a housing means which contains a porous filter bed, a gas inlet, a gas outlet and means for maintaining the water content of the filter bed, the filter bed comprising a quantity of carrier material disposed within the housing means and provided with microorganisms which metabolically convert the volatile contaminants in the off-gas stream into environmentally innocuous substances; a gas conduit for delivering the off-gas stream from the air-water contact apparatus to the fixed bed type biofilter, said gas conduit being in fluid communication with said gas outlet of the air-water contact apparatus and said gas inlet of the fixed bed type biofilter.