Effect of Fe3＋、Cu2＋ and Zn2＋ on the hydrolysis and acidification of two-phase anaerobic digesting kitchen wastes at different pH values
- Received Date: 13/11/2006
- Accepted Date: 28/08/2006
Abstract: The effects of Fe3＋, Cu2＋ and Zn2＋ on the two-phase anaerobic digestion of kitchen wastes at different pH values were studied by intermittent experiments. Different concentrations of Fe3＋、Cu2＋and Zn2＋ were added at pH=7 and without pH adjustment to study their effects on the hydrolysis and acidification processes. The results showed that, when pH=7, the addition of 50 mg/L Fe3＋ or 30 mg/L Cu2＋ would promote the hydrolysis and acidification, and the yield of volatile fatty acid (VFA) was also increased. Without pH adjustment the addition of less than 100 mg/L Fe3＋ or Cu2＋ would improve the yield of both lactic acid and VFA. But the addition of Zn2＋ didn’t affect the hydrolysis and acidification much whether pH=7 or without pH adjustment.
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