Journal
BIORESOURCE TECHNOLOGY
Volume 341, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125824
Keywords
Ammonia stripping; Anaerobic digestion; Short-chain fatty acids; Waste activated sludge
Funding
- National Natural Science Foundation of China [52000147, 51908448, 52070139]
- Young Talent Promotion Program of Xi'an [095920211328]
- Natural Science Foundation of Shaanxi Province [2020JQ-658]
- Natural Science Foundation project of Education Department of Shaanxi Province [20JK0715]
- Key Industrial Innovation Chain Project of Shaanxi Key RD Plan [2020ZDLNY06-08]
- Key Scientific Research Project of Education Department of Shaanxi Province [20JS081]
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This study proposed a promising approach, stepwise alkaline treatment coupled with ammonia stripping, to enhance short-chain fatty acids (SCFAs) production from waste activated sludge (WAS) anaerobic digestion. The strategy not only increased SCFAs production significantly, but also achieved nitrogen and carbon recovery, offering solutions for the carbon-neutral operation of wastewater treatment plants.
To recover resource from waste activated sludge (WAS) is of great significance. This study proposed a promising way, i.e., stepwise alkaline treatment coupled with ammonia stripping, to remarkably enhance short-chain fatty acids (SCFAs) production from WAS anaerobic digestion. The maximal production of SCFAs, with the value of 323 mg COD/g volatile suspended solid, was obtained with first initial pH = 10 adjustment followed by second initial pH = 10 adjustment on third day coupled with ammonia stripping. Mechanistic studies showed that solubilization of both extracellular polymeric substances and cells could be accelerated by stepwise initial pH = 10 adjustment. However, without ammonia stripping, the activities of either acidogens or methanogens could be inhibited by free ammonia formed under alkaline conditions; positively, anaerobes related to SCFAs production were enriched with ammonia stripping. Moreover, the proposed strategy can simultaneously achieve nitrogen and carbon recovery, providing some solutions for the carbon-neutral operation of wastewater treatment plants.
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