4.8 Article

Enhanced nitrogen removal from municipal wastewater via a novel combined process driven by partial nitrification/anammox (PN/A) and partial denitrification/anammox (PD/A) with an ultra-low hydraulic retention time (HRT)

期刊

BIORESOURCE TECHNOLOGY
卷 363, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127950

关键词

Anammox; Partial nitrification; Partial denitrification; Real municipal wastewater; Up -flow sludge bed

资金

  1. Key Program of National Natural Science Foundation of China [52131004]
  2. fund of innovation and entrepreneurship leading team project in Guangzhou [CYLJTD-201607]
  3. Biological Wastewater Treatment and Process Control Technology, Beijing International Science and technol-ogy Cooperation Bas
  4. Beijing Municipal Commission of Education

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This study established a novel combined process of anaerobic ammonia oxidation using a sequencing batch reactor and up-flow sludge beds, achieving efficient nitrogen removal from municipal wastewater.
Anaerobic ammonia oxidation (Anammox) is a highly productive research area in municipal wastewater treat-ment. A novel combined process driven by partial nitrification/anammox (PN/A) and partial denitrification/ anammox (PD/A) was established in this paper using a sequencing batch reactor (SBR) and two up-flow sludge beds (USBs). Municipal wastewater after carbon removal pretreatment in SBR entered PN/A-USB. PN/A process was initiated and enhanced by optimizing the intermittent aeration mode under low dissolved oxygen (DO). After enhancing and stabilizing the PD/A process, PN/A effluent entered the PD/A-USB along with raw municipal wastewater at a ratio of 4:1 and the combined system was established. Through this, this study achieved a nitrogen removal efficiency (NRE) of 84.9 % from municipal wastewater at an ultra-low total hy-draulic residence time (HRT) of 3.9 h. Candidatus Brocadia (1.8 % in PN/A, 1.0 % in PD/A) was the only functional anammox bacterium in the combined process.

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