Long-term impacts of titanium dioxide nanoparticles (TiO2 NPs) on performance and microbial community of activated sludge. (August 2017)

• Record Type: Journal Article
• Authors: Li, Zhiwei; Wang, Xuejiao; Ma, Bingrui; Wang, Sen; Zheng, Dong; She, Zonglian; Guo, Liang; Zhao, Yangguo; Xu, Qiaoyan; Jin, Chunji; Li, Shanshan; Gao, Mengchun
• Is Part Of: Bioresource technology. Volume 238(2017)
• Page Start: 361
• Page End: 368
• Publication Date: 2017-08
• Subjects: SBR sequencing batch reactor -- TiO2NPs titanium dioxide nanoparticles -- SOUR specific oxygen uptake rate -- SAOR specific ammonium oxidation rate -- SNOR specific nitrite oxidation rate -- SNRR specific nitrate reduction rate -- SNIRR specific nitrite reduction rate -- SPRR specific phosphorus release rate -- SPUR specific phosphorus uptake rate -- TTC triphenyl tetrazolium chloride -- DHA dehydrogenase -- AMO ammonia monooxygenase -- NOR nitrite oxidoreductase -- NIR nitrite reductase -- NR nitrate reductase -- PPK polyphosphate kinase -- PPX exopolyphosphatase -- SOP soluble orthophosphate -- ROS reactive oxygen species -- LDH lactate dehydrogenase -- MLSS mixed liquor suspended solids -- MLVSS mixed liquid volatile suspended solids -- DCF dichlorodihydrofluorescein -- OTU operational taxonomic units -- TN total nitrogen -- SEM scanning electron microscopy -- EDS energy dispersive X-ray spectrometer; TiO2 NPs -- Activated sludge -- ROS -- LDH -- Microbial community; 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.2017.04.069
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: SAOR and SNOR reduced with an increase in TiO2 NPs concentration from 0 to 60 mg/L. SPUR and SPRR decreased at 0–5 mg/L TiO2 NPs and increased at 10–60 mg/L TiO2 NPs. TiO2 NPs affected the microbial enzymatic activity of activated sludge. High TiO2 NPs concentration could promote the ROS production and LDH release. TiO2 NPs exerted obvious impacts on the microbial richness and diversity of SBR. Abstract: The long-term impacts of titanium dioxide nanoparticles (TiO2 NPs) on the performance and microbial community of activated sludge were evaluated in a sequencing batch reactor (SBR). TiO2 NPs impacted the COD and phosphorus removals of activated sludge, whereas the NH4 + -N removal efficiency had no distinct change at 0–60 mg/L TiO2 NPs. The presence of TiO2 NPs obviously inhibited the organic matter and nitrogen removal rates of activated sludge. The phosphorus removal rate gradually reduced at 0–5 mg/L TiO2 NPs and then increased at 10–60 mg/L TiO2 NPs. The removal rates of organic matter, nitrogen and phosphorus had the similar varying trends to the corresponding microbial enzymatic activities. High TiO2 NPs concentration promoted more reactive oxygen species (ROS) production and lactate dehydrogenase (LDH) release of activated sludge. The microbial richness and diversity of activated sludge were obviously affected at the phyla, class and genus levels.