Journal
CHEMOSPHERE
Volume 208, Issue -, Pages 793-799Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.06.060
Keywords
Partial-denitrification (denitratation); Nitrite accumulation; Thiosulfate; Anammox; Combined system; Less electron donor consumption
Categories
Funding
- Natural Science Foundation of Shenzhen [JCYJ20170306153655840]
- National Natural Science Foundation of China [51608444]
- Sichuan Science and Technology Program [2017JY0086]
- Sichuan Education Program [17ZB0107]
- Fundamental Research Funds for Central Universities [3102017zy002]
- Open Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection [SKLGP2018K016]
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To exploit the advantages of less electron donor consumptions in partial-denitrification (denitratation, NO3- -> NO2-) as well as less sludge production in autotrophic denitrification (AD) and anammox, a novel biological nitrogen removal (BNR) process through combined anammox and thiosulfate-driven denitratation was proposed here. In this study, the ratio of S2O32--S/NO3-N and pH are confirmed to be two key factors affecting the thiosulfate-driven denitratation activity and nitrite accumulation. Simultaneous high denitratation activity and substantial nitrite accumulation were observed at initial S2O32--S/NO3-N ratio of 1.5:1 and pH of 8.0. The optimal pH for the anammox reaction is determined to be 8.0. A sequential batch reactor (SBR) and an up-flow anaerobic sludge blanket (UASB) reactor were established to proceed the anammox and the high-rate thiosulfate-driven denitratation, respectively. Under the ambient temperature of 35 degrees C, the total nitrogen removal efficiency and capacity are 73% and 0.35 kg N/day/m(3) in the anammox-SBR. At HRT of 30 min, the NO3- removal efficiency could achieve above 90% with the nitrate-to-nitrite transformation ratio of 0.8, implying the great potential to apply the thiosulfate-driven denitratation & anammox system for BNR with minimal sludge production. Without the occurrence of denitritation (NO2- -> N2O -> N-2), theoretically no N2O could be emitted from this BNR system. This study could shed light on how to operate a high rate BNR system targeting to electron donor and energy savings as well as biowastes minimization and greenhouse gas reductions. (C) 2018 Elsevier Ltd. All rights reserved.
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