Abstract: A method of operating a waste water treatment facility to prevent bulking in which growth of floc forming bacteria is promoted within a selector aeration tank by controlling absorption and bio-oxidation of biodegradable soluble chemical oxygen demand by the bacteria. Absorption is controlled through measurement of a percentage removal of biodegradable soluble chemical oxygen demand and bio-oxidation is controlled through measurement of temperature corrected specific oxygen uptake rate. Both the absorption and bio-oxidation levels are controlled by decreasing the degree to which wastewater influent flow bypasses the selector aeration tank in favor of the main aeration tank when either of absorption or bio-oxidation are below targeted ranges and increasing flow rate of recycle activated sludge from the clarifier to the main aeration tank while decreasing recycle activated sludge flow rate to the selector aeration tank when absorption and bio-oxidation are above such targeted ranges.

Abstract: A system and method for ozone vent gas reuse is provided. The disclosed system and method involve controlling or conditioning the ozone vent gas stream or degassing unit vent gas stream and directing the stream to a mechanically agitating contactor in an aerobic section of the wastewater treatment system. The oxygen content of the vent gas stream is controlled so as to ensure sufficient oxygenation to the aerobic section of the wastewater treatment system. Control may be effected by adjusting the oxygen content of the vent gas stream in response to sensor or measurement inputs characterizing the gas contents of the vent gas stream or the dissolved oxygen levels. The volumetric flow of the vent gas stream to the aerobic section may also be controlled by adjusting the rotational speed of the mechanically agitating contactor in an aerobic section of the wastewater treatment system.

Abstract: The present invention relates generally to the destruction of chemical weapons. In particular, the present invention relates to methods for treating hydrolysates of chemical agents. In one embodiment, the present invention provides a method comprising oxidizing a hydrolysate of a chemical agent to produce an aqueous layer and an organic layer, the aqueous layer comprising an organophosphorus concentration and the organic layer comprising an organosulfur concentration, and separating the organic layer from the aqueous layer.

Abstract: The present invention relates generally to the destruction of chemical weapons. In particular, the present invention relates to methods for treating hydrolysates of chemical agents. In one embodiment, the present invention provides a method comprising oxidizing a hydrolysate of a chemical agent to produce an aqueous layer and an organic layer, the aqueous layer comprising an organophosphorus concentration and the organic layer comprising an organosulfur concentration, and separating the organic layer from the aqueous layer.