Abstract
The objective of this study is to evaluate the inhibitory effect of inorganic and organic coagulant on acidogenic fermentation in municipal wastewater treatment plant. It was found that the conversion from organic matter to Volatile Fatty Acid (VFA) decreased more than 10% when the dosages of coagulant exceeded 46 mg-Al/L and 120 mg-Fe/L. Inhibitory effect by Al on acidogenic fermentation was greater than that by Fe. When the dosage of organic polymer was over 102 mg/L, the VFA conversion fell to below 2%. Ultrasonic treatment could increase the VFA conversion for coagulated sludge for all the coagulants tested (over 12%).
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