Enhanced nitrate, fluoride, and phenol removal using polyurethane sponges loaded with rice husk biochar in immobilized bioreactor. (November 2022)

• Record Type: Journal Article
• Authors: Wang, Zhao; Su, Junfeng; Zhang, Ruijie; Li, Kai; Hu, Ruizhu; Liu, Yu; Zhang, Lingfei; Li, Jiawei
• Is Part Of: Bioresource technology. Volume 364(2022)
• Publication Date: 2022-11
• Subjects: Biocarrier bulk modification -- Microbially induced calcium precipitation -- Microbial community -- Multiple pollutants; 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.2022.128098
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: RBPs were prepared to intensify the NO3 −, F −, and phenol removal in the bioreactor. Biochar load and increased C:N ratio boosted the SMP secretion and ESTA. F − was mainly removed in the form of fluoride-containing calcium precipitates. Biochar and adequate carbon sources contributed to C- and N- related metabolism. The introduction of biochar reduced the demand for C:N ratio in the system. Abstract: Polyurethane sponges loaded with rice husk biochar were prepared to immobilize Aquabacterium sp. CZ3 for intensified removal of nitrate, fluoride (F − ), and phenol, with the maximum efficiency of 100 %, 91 %, and 99 %, respectively. The biochar load and increased carbon-to-nitrogen (C:N) ratio (below 3.0) stimulated the secretion of soluble microbial product, improved the electron transport system activity, and promoted denitrification, phenol co-metabolism, and F − and calcium crystallization. The characterization results suggested that F − was removed as fluoride-containing calcium precipitates. According to the microbial community analyses, Aquabacterium was the dominant bacterium. PICRUSt analyses showed that biochar and adequate carbon sources (C:N ratio 3.0) significantly increased the functional abundances of amino acid metabolism, carbohydrate metabolism, energy metabolism, and cell motility. The introduction of biochar reduces the demand for C:N ratio in the system, and expands the application potential of biomineralization technique in the remediation of multiple pollutants contaminated water.