蓝藻与污泥混合厌氧发酵产沼气的初步研究

Biogas production through anaerobic digestion from the mixture of blue algae and sludge

为了实现太湖蓝藻打捞后的快速处置，对厌氧颗粒污泥、消化污泥、剩余污泥与蓝藻混合厌氧发酵产沼气进行了研究。结果表明，蓝藻与污泥混合可以有效促进沼气发酵。在蓝藻与厌氧颗粒污泥物料比为6：1时，产气效果最佳，沼气产率为73mL／g VS，平均甲烷含量为69％，最大产气速率为138mL／d，累计产甲烷量为50mL CH4／g干物质，分别是蓝藻与消化污泥、剩余污泥混合发酵时的1．5倍和2．3倍。厌氧颗粒污泥、消化污泥、剩余污泥与蓝藻混合，其VS降解率为11．40％～13．73％，COD减少了27．97％～46．38％。厌氧发酵对蓝藻藻毒素的含量有较大影响，分别从356、366和244ug／L降低到检测限5ug／L以下。

The feasibility of methane production from blue algae through anaerobic fermentation from the mixture of blue algae and anaerobic granular sludge, digestive sludge and excessive sludge, respectively, were investigated. It indicated that methane fermentation would be enhanced by co-digestion of blue algae and sludge. The biogas yield was 73 mL/g VS, average methane content was 69% , and maximum biogas production rate was 138 mL/d when the materiel ratio of blue algae and anaerobic granular sludge was 6： 1. Methane yield was 50 mL CH4/g VS for the mixture of blue algae and granule sludge, which was 1.5 and 2.3 times as high as that of the co-digestion with digestive and excessive sludge, respectively. Moreover, the algae toxin content was decreased sharply, for it was below the detection limitation of 5 ug/L after the anaerobic fermentation process finished.