Nitrogen removal by a Hydroxyapatite-enhanced Micro-granule type One-stage partial Nitritation/anammox process following anaerobic membrane bioreactor treating municipal wastewater

Yujie Chen; Gaoxuefeng Feng; Guangze Guo; Zibin Luo; Chao Rong; Tianjie Wang; Yan Guo; Yu-You Li

doi:10.1016/j.biortech.2022.126740

Nitrogen removal by a Hydroxyapatite-enhanced Micro-granule type One-stage partial Nitritation/anammox process following anaerobic membrane bioreactor treating municipal wastewater

Bioresour Technol. 2022 Mar:348:126740. doi: 10.1016/j.biortech.2022.126740. Epub 2022 Jan 21.

Authors

Yujie Chen¹, Gaoxuefeng Feng¹, Guangze Guo², Zibin Luo¹, Chao Rong², Tianjie Wang¹, Yan Guo³, Yu-You Li⁴

Affiliations

¹ Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
² Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
³ Department of Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China.
⁴ Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aoba, Aramaki-Aza, Aoba-ku, Sendai, Miyagi 980-8579, Japan; Department of Frontier Science for Advanced Environment, Graduate School of Environmental Studies, Tohoku University, 6-6-20 Aoba, Aramaki-Aza, Aoba-ku, Sendai, Miyagi 980-8579, Japan. Electronic address: gyokuyu.ri.a5@tohoku.ac.jp.

PMID: 35074463
DOI: 10.1016/j.biortech.2022.126740

Abstract

Nitrogen removal from wastewater by the partial nitritation/anammox (PNA) technology is promising from both economic and environmental perspectives. However, this technology has not been popularized in the mainstream because of low biomass retention and the growth of the nitrite oxidizing bacteria. In this study, a one-stage PNA process with hydroxyapatite (HAP)-enhanced granules was used to treat effluent from a mainstream anaerobic membrane bioreactor. The HAP-enhanced reactor allowed an enriched high biomass of 6.9 ± 0.2 g/L at a low hydraulic retention time of 2 h. A nitrogen removal efficiency of 80 ± 6.0 %, a nitrogen removal rate of 0.36 ± 0.05 kg/m³/d and a COD removal efficiency of 54 ± 15 % were achieved stably, leading to a low total nitrogen concentration of 8.5 ± 2.7 mg/L and a low COD concentration of 19.7 ± 5.9 mg/L in the effluent. Anammox bacteria of Candidatus Kuenenia stuttgartiensis and ammonium oxidizing bacteria of Nitrosomonas were found to be the two most predominant bacteria.

Keywords: Anammox; HAP; Mainstream; NOB; One-stage PNA.

MeSH terms

Ammonium Compounds*
Anaerobic Ammonia Oxidation
Anaerobiosis
Bioreactors / microbiology
Denitrification
Durapatite
Nitrogen
Oxidation-Reduction
Sewage
Wastewater*

Substances

Ammonium Compounds
Sewage
Waste Water
Durapatite
Nitrogen