Journal
BIORESOURCE TECHNOLOGY
Volume 220, Issue -, Pages 601-608Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.08.043
Keywords
Waste activated sludge; Volatile fatty acids; Nutrients removal; Dewaterability; Alkaline digestion; Magnesium hydroxide
Funding
- National Natural Science Foundation of China [51278248]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse of China
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In this study, the combination treatment of NaOH and Mg(OH)(2) was applied to anaerobic digestion of waste activated sludge (WAS) for simultaneously enhancement of volatile fatty acids (VFAs) production, nutrients removal and sludge dewaterability. The maximum VFAs production (461 mg COD/g VSS) was obtained at the NaOH/Mg(OH)(2) ratio of 75:25, which was much higher than that of the blank or sole NaOH. Moreover, nutrients removal and sludge dewaterability were improved by the combined using of NaOH and Mg(OH)(2). Mechanism investigations revealed that the presence of Mg(OH)(2) could maintain alkaline environment, which contributed to inhibit the activity of methanogens. Also, the bridging between Mg2+ and extracellular polymeric substances (EPS) plays an important role in the solubilization and dewatering of sludge. High-throughput sequencing analysis demonstrated that the abundance of bacteria involved in sludge hydrolysis and VFAs accumulation was greatly enriched with the mixtures of NaOH and Mg(OH)(2). (C) 2016 Elsevier Ltd. All rights reserved.
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