WASTEWATER TREATMENT OPERATIONAL METHOD

摘要

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.