Enrichment and retention of key functional bacteria of partial denitrification-Anammox (PD/A) process via cell immobilization: A novel strategy for fast PD/A application. (April 2021)

• Record Type: Journal Article
• Authors: Jiang, Hao; Wang, Zhong; Ren, Shang; Qiu, Jingang; Zhang, Qiong; Li, Xiyao; Peng, Yongzhen
• Is Part Of: Bioresource technology. Volume 326(2021)
• Publication Date: 2021-04
• Subjects: Partial denitrification -- Anammox -- Bio-carriers -- Cell immobilization -- Poly(vinyl alcohol)/sodium alginate; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2021.124744
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: PD/A was realized fastly in 20 days via cell immobilization for the first time. Thauera and Kuenenia genera were enriched and retained effectively. Thauera genus with high abundance of 30.6% guaranteed nitrite supply for Anammox. Anammox contributed to 77.10% TN removal. PVA/SA gel matrix ensured advanced nitrogen removal under 13 °C. Abstract: Cell immobilization was used to enrich and retain functional bacteria within partial denitrification-Anammox (PD/A) process to achieve its fast start-up for the first time. To do so, residue sludge and Anammox sludge were immobilized in poly (vinyl alcohol)/sodium alginate (PVA/SA) gel for PD cultivation and Anammox bacteria inoculation, respectively. Stable PD with NO3 − -N to NO2 − -N transformation ratio (NTR) of 72.0% was achieved within 13 days at 25 °C and successfully combined with Anammox on 14th day. The hydrous porous PVA/SA gel matrix played the role of extracellular polymeric substance (EPS) and thus protected the microbes against low temperature. Satisfactory nitrogen removal rate (NRR) (301.6 ± 6.1 g N/(m 3 ·d)) was achieved even when temperature decreased to 13 °C. The contribution of nitrogen removal via Anammox was as high as 77.10%. Abundance of Thauera and Candidatus Kuenenia increased from 0.9% and 1.1% to 30.6% and 2.1%, respectively.