Simultaneous removal of nitrogen, phosphorus, and organic matter from oligotrophic water in a system containing biochar and construction waste iron: Performances and biotic community analysis

• Published in: Environmental research 2024-08, Vol.255, p.119187-119187, Article 119187
• Main Authors: Wei, Hao, Xu, Liang, Su, Junfeng, Liu, Shuyu, Zhou, Zhennan, Li, Xuan
• Format: Article
• Language: English
• Subjects: Charcoal - chemistry; Construction waste iron; Functional gene prediction; Iron - chemistry; Microbial community; Nitrogen - analysis; Nitrogen - metabolism; Oligotrophic water; Phosphorus - analysis; Phosphorus removal; Waste Disposal, Fluid - methods; Water Pollutants, Chemical - analysis
• ISSN: 0013-9351; 1096-0953
• DOI: 10.1016/j.envres.2024.119187

The issue of combined pollution in oligotrophic water has garnered increasing attention in recent years. To enhance the pollutant removal efficiency in oligotrophic water, the system containing Zoogloea sp. FY6 was constructed using polyester fiber wrapped sugarcane biochar and construction waste iron (PWSI), and the denitrification test of simulated water and actual oligotrophic water was carried out for 35 days. The experimental findings from the systems indicated that the removal efficiencies of nitrate (NO3–−N), total nitrogen (TN), chemical oxygen demand (COD), and total phosphorus (TP) in simulated water were 88.61%, 85.23%, 94.28%, and 98.90%, respectively. The removal efficiencies of actual oligotrophic water were 83.06%, 81.39%, 81.66%, and 97.82%, respectively. Furthermore, the high−throughput sequencing data demonstrated that strain FY6 was successfully loaded onto the biological carrier. According to functional gene predictions derived from the Kyoto Encyclopedia of Genes and Genomes (KEGG) database, the introduction of PWSI enhanced intracellular iron cycling and nitrogen metabolism. [Display omitted] •The bio-carrier with sugarcane biochar and waste iron (PWSI) was constructed.•The bioreactor operated for 35 days with actual oligotrophic water.•The bioreactor can efficiently remove of NO3−-N, TN, PO43–P, and CODMn.•PWSI and bio-iron precipitation were contributed to the removal of phosphate.•PWSI promoted nitrogen metabolism and iron redox cycle.