不同pH值条件下Fe3+、Cu2＋和Zn2＋对厨余垃圾两相厌氧消化水解酸化过程的影响
Effect of Fe3＋、Cu2＋ and Zn2＋ on the hydrolysis and acidification of two-phase anaerobic digesting kitchen wastes at different pH values
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摘要: 通过间歇实验研究了在pH=7和不调节pH两种情况下添加不同浓度的Fe3＋、Cu2＋和Zn2＋对厌氧消化水解酸化阶段有机酸组分和含量的影响。结果表明，pH=7时，添加50 mg/L Fe3＋和30 mg/L Cu2＋，有利于厨余垃圾水解酸化过程的进行，反应生成的VFA（挥发性脂肪酸）含量增加。不调节pH时，添加100 mg/L以下的Fe3＋和Cu2＋对VFA含量也有所促进，但乳酸含量也增加。在2种pH条件下添加Zn2＋对反应的促进或抑制作用均不明显。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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