酸碱预处理对单室生物电化学系统中污泥降解和能量回收的影响

Effects of acid and alkaline pretreatments on sludge degradation and energy recovery in a single-chamber bioelectrochemical system

本研究利用生物电化学系统(bioelectrochemical systems,BESs)强化污泥降解,同时从污泥中回收能量;并比较了酸碱预处理对污泥在单室微生物燃料电池(single-chamber microbial fuel cell,SMFC)中的降解和能量回收的影响.结果表明,酸碱预处理均能在不同程度上促进污泥的降解和系统对电能的回收.当污泥预处理pH=12时,SMFC具有最高的输出功率(493.73 mW·m^(−2))和TCOD去除率(48.85%).酸碱预处理后都未观察到挥发性脂肪酸(volatile fatty acids,VFAs)的累积现象,说明酸碱预处理破坏的细胞结构,并未向VFAs的转化,仅仅是转化为利于微生物降解的成分.本研究的结果有助于BESs最佳酸碱预处理条件以及有机质转化机制的确定.

This study we have enhanced sludge degradation from sewage sludge using bioelectrochemical systems(BESs)and compared the effects of acid and alkaline pretreatments on sludge degradation and energy recovery in a single-chamber microbial fuel cell(SMFC).The results showed that both the acid and alkaline pretreatments promoted electricity generation and sludge reduction.The SMFC with sludge pretreated at pH of 12 exhibited the highest power output(493.73 mW·m^(−2))and total chemical oxygen demand(TCOD)removal rate(48.85%).The volatile fatty acids(VFAs)accumulation phenomenon after pretreatment was not observed in our experiment,which indicated that alkali/acid pretreatment just break biomass into soluble ingredients rather than VFAs.This study contributes to the determination of optimum treatment conditions of acid or alkaline pretreatment and mechanism of organic matters transformation in BESs.