Activated sludge material, method for reducing excess sludge production in bioreactor, and method of controlling bioreactor
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United States of America Patent
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Dec 10, 2013
Grant Date -
Aug 19, 2010
app pub date -
Aug 26, 2008
filing date -
Aug 28, 2007
priority date (Note) -
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Abstract
Excess sludge production in a bioreactor of a wastewater treatment plant in which excess sludge is being produced is reduced by adding an activated sludge material having a chitinase specific activity of at least 150 Units/g-MLSS and a pectinase specific activity of at least 120 Units/g-MLSS to the bioreactor. After the addition of the activated sludge material, the bioreactor is controlled by adding the activated sludge material when any one of the chitinase activity, the pectinase activity, and the protease specific of the sludge in the bioreactor drops below the lower limits of 50 Units/L, 40 Units/L, and 0.3 Units/L, respectively.
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