Journal
BIORESOURCE TECHNOLOGY
Volume 222, Issue -, Pages 217-225Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.10.010
Keywords
Waste activated sludge; Phosphorus species; Enhancement mechanism; pH; Molybdate reactive P accumulation
Funding
- National Science Foundation for Distinguished Young Scholars of China [51225802]
- National Natural Science Foundation of China (NSFC) [51578534]
- Hundred Talents Program of the Chinese Academy of Sciences, China
- Project 135 of Chinese Academy of Sciences, China [YSW2013B06]
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This study aimed to clarify phosphorus (P) fractions in waste activated sludge (WAS) and explore release performance and enhancement mechanism of different P species related to pH. Results showed that inorganic P (IP) was the major P fraction in raw sludge (87.86% of total solid P), and non-apatite inorganic P (NAIP), the most labile P forms, occupied 81.30% of IP, suggesting that WAS could be selected as potential substitution of phosphate rock. The optimized acid and alkaline conditions were pH = 4 and pH = 12 for molybdate reactive P accumulation, increased by 311.20 mg/L and 479.18 mg/L compared to raw sludge, which were 3.80 and 5.84 times higher than that of control, respectively. The mechanism study demonstrated that high pH promoted NAIP release, and apatite P was sensitive to low pH. Moreover, the releasable and recoverable P depended on both fractions of different P species in sludge and pH adjustment for sludge treatment. (C) 2016 Elsevier Ltd. All rights reserved.
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