Evaluation of the anaerobic biodegradability of 1,4-butynediol
This study evaluated the degradation efficiency of 1,4-butynediol(BYD)under three types of anaerobic biochemical conditions through batch experiments.The results showed that direct BYD degradation was relatively slow by anaerobic granular sludge with BYD as a solo carbon source,whereas the combination of activated sludge and anaerobic granular sludge,as well as sulfate(SO42-)augmentation,could enhance the degradation of BYD.Thereafter,the simulated BYD wastewater was taken as treatment object,anaerobic granular sludge combined with activated sludge was taken as seed sludge,The long-term running of UASB reactors was performed.The BYD degradation was studied under anaerobic methanogenic metabolism condition and sulfate reduction condition,respectively.The result showed that the removal of BYD under anaerobic methanogenic metabolism condition was not good,and the complexation reaction could occur between BYD with high concentration(2 980 mg·L-1)and trace metal elements,which led to the decrease of the methanogenic archaea activity and accumulation of volatile fatty acids after long-term running.The methanogenic archaea activity could be recovered through supplementary addition of trace metal elements.The increase of SO42-concentration and decrease of COD/SO42-ratio in influent could result in sulfate reduction dominating the anaerobic metabolic pathway.At the influent COD/SO42-ratio of 1(m/m,SO42-concentration of 10 000 mg·L-1),the degradation of BYD increased to 21.92％,and sulfate reducing bacteria Desulfovibrio and Desulforhabdus became the dominant genera in UASB.At this time,the free hydrogen sulfide with high concentration inhibited the methanogenic archaea and sulfate reduction bacteria,causing the high accumulation of volatile fatty acid in anaerobic system occurred again.Even though the influent was stop,the inhibiting results by free hydrogen sulfide was difficult to recover in a short period of time.This study indicated that sulfate reduction can promote the anaerobic biodegradation of BYD,which could provide the guidance for the design of treatment processes for BYD containing wastewater.
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