Bdellovibrio-and-like organisms （BALOs） are a group of ubiquitous and obligate predatory bacteria and conmlonly used as biocontrol agents. In this study, an efficient, environmental-friendly, and convenient BALOs en...Bdellovibrio-and-like organisms （BALOs） are a group of ubiquitous and obligate predatory bacteria and conmlonly used as biocontrol agents. In this study, an efficient, environmental-friendly, and convenient BALOs encouraged municipal waste sludge biolysis pretreatment technique was developed and investigated for dewaterability enhancement of excess waste sludge. The indigenous predatory BALOs were successfully isolated from the sludge for biolysis treatment. Without any chemical addition or pH adjustment, the sludge specific resistance （SRF） and capillary suction time （CST） were significantly reduced by as high as 53.4% and 23.8%, respectively within 24 h＇s treatment, which would further be lowered with the increase of BALOs input dosage. However, the continuous extension of reaction time would women the sludge dewaterability. The decreases of SRF and CST accompanied with the increases of sludge disintegration degree and soluble chemical oxygen demand, nitrogen, and phosphorus concentrations all emphasized the contributions of BALOs＇ predation activities to sludge disturbance, cell lysis, and consequently the release of sludge intracellular water to finally effectively improve the sludge dewaterability and disposal efficiency.展开更多
基金Acknowledgements This study was supported by the National Natural Science Foundation of China （Grant No. 51208092） and Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Human Resources and Social Security of the People＇s Republic China （2014）.
文摘Bdellovibrio-and-like organisms （BALOs） are a group of ubiquitous and obligate predatory bacteria and conmlonly used as biocontrol agents. In this study, an efficient, environmental-friendly, and convenient BALOs encouraged municipal waste sludge biolysis pretreatment technique was developed and investigated for dewaterability enhancement of excess waste sludge. The indigenous predatory BALOs were successfully isolated from the sludge for biolysis treatment. Without any chemical addition or pH adjustment, the sludge specific resistance （SRF） and capillary suction time （CST） were significantly reduced by as high as 53.4% and 23.8%, respectively within 24 h＇s treatment, which would further be lowered with the increase of BALOs input dosage. However, the continuous extension of reaction time would women the sludge dewaterability. The decreases of SRF and CST accompanied with the increases of sludge disintegration degree and soluble chemical oxygen demand, nitrogen, and phosphorus concentrations all emphasized the contributions of BALOs＇ predation activities to sludge disturbance, cell lysis, and consequently the release of sludge intracellular water to finally effectively improve the sludge dewaterability and disposal efficiency.
