Journal
BIORESOURCE TECHNOLOGY
Volume 284, Issue -, Pages 16-24Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.03.116
Keywords
Biological nutrients removal; Polyhydroxyalkanoates; Free nitrous acid; Nitrite accumulation; Denitrifying phosphorus removal; Anaerobic digestion
Funding
- National Natural Science Foundation of China (NSFC) [51779089]
- Natural Science Funds of Hunan Province for Distinguished Young Scholar [2018JJ1002]
- Zhejiang Provincial Natural Science Foundation of China [LY18E080001]
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A novel strategy to achieve substantial polyhydroxyalkanoates (PHA) accumulation in waste activated sludge (WAS) was developed, which was conducted in a two-sludge system consisted of an anaerobic/anoxic/oxic reactor (AAO-SBR) and a nitrifying reactor (N-SBR), where the nitrifying-sludge was treated by free nitrous acid (FNA). Initially, 0.98 +/- 0.09 and 1.46 +/- 0.10 mmol-c/g VSS of PHA were respectively determined in the control-SBR and AAO-SBR. When 1/16 of nitrifying sludge was daily treated with 1.49 mg N/L FNA for 24 h, similar to 46.5% of nitrite was accumulated in the N-SBR, similar to 2.43 +/- 0.12 mmol-c/g VSS of PHA was accumulated in WAS in AAO-SBR without deteriorating nutrient removal. However, nutrient removal of control-SBR was completely collapsed after implementing the same FNA treatment. Further investigations revealed that the activity and abundance of nitrite oxidizing bacteria (NOB) was decreased significantly after FNA treatment. Finally, sludge with high PHA level to generate more methane was confirmed.
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