Isolation and application of predatory Bdellovibrio-and-like organisms for municipal waste sludge biolysis and dewaterability enhancement

• Published in: Frontiers of environmental science & engineering Vol. 11; no. 1; pp. 99 - 109
• Main Authors: Yu, Ran, Zhang, Shiwen, Chen, Zhoukai, Li, Chuanyang
• Format: Journal Article
• Language: English
• Published: Beijing Higher Education Press 01.02.2017; Springer Nature B.V
• Subjects: Activated sludge; Bdellovibrio-and-like organisms (BALOs); Biological control; Biolysis; Chemical oxygen demand; Dewaterability; Disintegration; Earth and Environmental Science; Environment; Intracellular; Lysis; Municipal wastes; Predation; Research Article; Sludge; Sludge disposal; Suction; Water content; 化学需氧量; 应用类; 性能增强; 污泥比阻; 生物垃圾; 生物降解; 脱水性能; 蛭弧菌; Biolysis; Activated sludge; Dewaterability; Predation; and-like organisms (BALOs)
• ISSN: 2095-2201; 2095-221X
• DOI: 10.1007/s11783-017-0900-3

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.