Micro-graphite particles accelerate denitrification in biological treatment systems. (July 2020)

• Record Type: Journal Article
• Authors: Li, Junzhang; Peng, Zhaozhou; Hu, Ruiyang; Gao, Kaiyuan; Shen, Chen; Liu, Shouxin; Liu, Runjing
• Is Part Of: Bioresource technology. Volume 308(2020)
• Publication Date: 2020-07
• Subjects: Accelerated denitrification -- Industrial wastewater -- Micro-graphite particles -- Toxicity of graphite; 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.2020.122935
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Low-dose MGP accelerates denitrification in synthetic and industrial wastewater. MGP can improve the proportion of Paracoccus in a sample. MGP can enhance the abundance of the nirS gene. MGP has hormesis effects on denitrifying bacteria. Abstract: Accelerated denitrification is an essential problem in the biological treatment of nitrogenous wastewater. In this study, we report that denitrification is accelerated by micro-graphite particles (MGPs). The denitrification rate was increased by 83.4% or 11.1% in synthetic (with 0.16 g/L MGPs) or industrial nitrogenous wastewater (with 0.12 g/L MGP), respectively. The mechanism was revealed via a quantitative polymerase chain reaction (q-PCR), high-throughput sequencing, and scanning electron microscopy (SEM). The abundance of denitrifying bacteria Paracoccus in the sludge was increased by micro-graphite particles. The number of denitrifying bacteria with the nirS gene was increased significantly (75.6%). To the best of our knowledge, this is the first report that MGP could enhance denitrification via the sludge. MGP can denitrify in industrial applications.