冻融破解预处理剩余污泥及强化微生物电解池处理效能

针对微生物电解池（MEC）处理剩余污泥时水解速率慢、有机质降解率低的问题，采用冻融破解预处理剩余污泥，探讨了冻融对污泥泥质的影响及对后续MEC处理效能的强化作用。结果表明:冻融处理可以有效促进污泥絮体解散、细胞破裂及有机物溶出，在-18℃冷冻72 h，26℃融解3 h后，污泥SCOD增加了2.58倍。以冻融污泥为底物的MEC装置，在0.7 V外加电压条件下，污泥SS和TCOD去除率分别超过40%和60%。与未经处理的原泥相比，冻融处理提高了MEC装置的库伦效率和阴极H₂回收率，分别提高了5.8%和6.7%。微生物群落分析表明，冻融预处理促进了微生物电解过程中产电菌群（如变形菌门（Proteobacteria）、厚壁菌门（Firmicutes））的生长和富集，改善了剩余污泥的资源利用和能源回收效益。

EFFECT OF FREEZING/THAWING PRETREATMENT ON EXCESS SLUDGE DISINTEGRATION AND TREATMENT EFFICIENCY OF MICROBIAL ELECTROLYSIS CELL

In this study, freezing/thawing pretreatment was adopted to disrupt sludge matrix in order to improve hydrolysis rate and degradation of organic matter in microbial electrolysis cell (MEC) feeding with excess sludge. The influence of freezing/thawing on sludge characteristics and performance of subsequent MEC was discussed. The results showed that freezing/thawing pretreatment could effectively promote the floc disintegration, cell rupture and organics dissolution of the sludge. When being freezed at -18℃ for 72 h and then thawed at 26℃ for 3 h, the SCOD content in the sludge increased by 2.58 times. At applied voltage of 0.7 V, with freezing/thawing-pretreated sludge as the substrate, the removal rates of SS and TCOD in MEC exceeded 40% and 60%, respectively. Compared with raw sludge, the pretreatment increased coulomb efficiency and cathode hydrogen recovery in MEC by 5.8% and 6.7%, respectively. Microbial community analysis showed that freezing/thawing pretreatment facilitated the enrichment of exoelectrogens (including Proteobacteria and Firmicutes) in MEC, therefore improved the overall utilization and energy recovery from excess sludge via MEC.