Journal
BIORESOURCE TECHNOLOGY
Volume 316, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.123926
Keywords
Mainstream conditions; Partial nitrification-anaerobic ammonium; oxidation (PN-anammox); Enhanced autotrophic denitrification; Sulfur; Single coupled system
Funding
- National Key Research and Development Programme of China [2016YFC0401103]
- Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment
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Stabilization of nitrification process and reduction of NO3--N concentration in effluent are the keys to realize mainstream application of partial nitrification-anaerobic ammonia oxidation (PN-anammox) process. The sulfur-based autotrophic denitrification (SADN) process was coupled with the PN-anammox in a single reactor to enhance and stabilize the nitrogen removal performance, and the feasibility and reaction characteristics of the coupling system under mainstream conditions were investigated. The results showed that the NO3- of PN-anammox effluent dropped from 22 to 24 mg/L to 5 mg/L after the SADN process coupled, and the total nitrogen removal efficiency and total nitrogen removal rate reached 83.5% and 0.15 kg/(m(3).d), respectively. This coupling system doesn't need to over-strengthen PN control. Batch experiments showed that sulfur autotrophic oxidizing bacteria used O-2 to oxidize S2- in the coupling system, which competed with SADN to remove NO3-. Moreover, Nitrosomonas, Candidatus Brocadia and Thiobacillus were the main genera for nitrogen and sulfur conversion.
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