We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Accelerating phosphorus release from waste activated sludge by nitrilotriacetic acid addition during anaerobic fermentation process and struvite recovery.
- Authors
Xu, Haiqing; Guo, Liang; Zhao, Yangguo; Gao, Mengchun; Jin, Chunji; Ji, Junyuan; She, Zonglian
- Abstract
Phosphorus (P) recovery from waste activated sludge (WAS) could achieve sustainable development and reduce environmental hazards simultaneously. The objective of this study was to enhance P release from WAS by nitrilotriacetic acid (NTA) addition and struvite recovery. The maximal P release efficiency reached 90.3 % from WAS at the dose of 25.0 mM NTA after anaerobic fermentation 12 h. The NTA addition promoted nonapatite inorganic phosphorus (NAIP) and apatite phosphorus (AP) release from WAS while it had a negative effect on organic phosphorus (OP) release. The NTA was beneficial for the protein release from WAS, but it inhibited the release of NH 4 +-N. By means of struvite precipitation, the PO 4 3−-P and NH 4 +-N recovery rates at optimal initial pH = 9 of the fermentation supernatant reached 92.9 % and 51.5 %, respectively. Meanwhile, the purity and yield of the produced struvite were 85.8 % and 174.0 mg/g SS (per gram of dry sludge) determined by elemental analysis, respectively. The levels of heavy metals in struvite products were below the permissible limits of Cultivated Land Application Standard. Therefore, the results of this study enriched the P recovery path from WAS to guide the application.
- Subjects
NITRILOTRIACETIC acid; FERMENTATION; WASTE recycling; HAZARDS; METAL products; PHOSPHORUS; HEAVY metals
- Publication
Process Safety & Environmental Protection: Transactions of the Institution of Chemical Engineers Part B, 2021, Vol 147, p1066
- ISSN
0957-5820
- Publication type
Article
- DOI
10.1016/j.psep.2021.01.033