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Title

OPTIMIZATION OF WASTEWATER TREATMENT PLANTS OPERATION BY ACTIVATED SLUDGE PROCESS FOR PREVENTING THE CRITICAL GROWTH OF MICROTHRIX PARVICELLA BACTERIA

Pages

 Start Page 456 | End Page 466

Abstract

 In recent years, MICROTHRIX PARVICELLA has been identified as the main element of sludge bulking in WASTEWATER TREATMENT PLANTs by activated sludge process. Methods: (1) the measurement of lengthy chain of fatty Acids (2) Pilot study.(3) Laboratory Study.(4)Microscopic Study. Results :(1) MICROTHRIX PARVICELLA is a gramm positive bacteria. Its presence in the urban WASTEWATER TREATMENT PLANTs depend on the low Sludge loading (less than 3 grams of the lengthy chain fatty acid for each kilogram of solid material per day.) (2) The critical Growth of the bacteria is being observed at less than 15° Celsius. (3) The utilized main substrate of the bacteria is the lengthy chain fatty acid. (4) The bacteria is being accumulated in sludge foam where there is a suitable place for the Growth of the bacteria.(5) POLYALUMINUM CHLORIDE (PAC) will prevent the Lipase production as well as Enzyme activity of the bacteria, consequently, it has negative effect on the amount of substrate absorption (hydrolysed fats) by the bacteria. If 2 to 3 grams of Al3+ are used for each kilograms of solid material per day, which is selected proportionate to the sludge life, the bacteria can be eliminated completely. (6) If the primary sedimentation is utilized for about 20% eliminated load of the solid material, concerning the remarkable elimination of mentioned bacteria, there is not a noticeable change in the Sludge volume index.

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