Insight into enrichment of anammox bacteria by a polyurethane sponge carrier coupled with iron-carbon micro-electrolysis under no strict anaerobic condition. (March 2022)

• Record Type: Journal Article
• Authors: Cheng, Benai; Du, Jiangkun; Bao, JianGuo; Tufail, Haseeb; Xu, Tiantian; Zhang, Yi; Mao, Qidi; Faheem, Muhammad
• Is Part Of: Bioresource technology. Volume 347(2022)
• Publication Date: 2022-03
• Subjects: Anammox -- Composite carrier -- Iron-carbon -- Micro-electrolysis -- Anaerobic microenvironment; 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.2022.126673
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: ICME-PS carriers can rapid enrichment of anammox bacteria. Small-pore carriers improved biofilm stability, while medium-pore carriers achieved long-term stable and efficient biofilms. ICME was firstly used for DO consumption and then mainly for nitrogen cycle reactions. ICME application reduced energy barriers to improve sludge aggregation. Abstract: A novel composite carrier (ICME-PS) was formed by coupling polyurethane sponge carriers (PS) with different pore sizes (15, 25, 40 ppi) and iron-carbon micro-electrolysis (ICME), which was used for enrichment of anammox bacteria and stable operation under no strict anaerobic condition. An increase of 5.67%-38.55% in specific anammox activity (SAA), an significant enhancement of biofilm stability and an improvement of 14.61%-42.38% in Ca.Brocadia were observed in ICME-PS, compared to PS carriers. ICME played a dual role: 1) contributed to the formation of an anaerobic microenvironment; 2) used for nitrogen cycle reactions. Additionally, small-pore carriers with highest biofilm stability can be used in high shear environments, while medium-pore carriers achieved the highest SAA in stable environments. Extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) analysis indicated that ICME application reduced the energy barrier and improved aggregation performance. This study designed a novel composite carrier to broaden the application of anammox under no strict anaerobic condition.