title: Performance evaluation, microbial enzymatic activity and microbial community of a sequencing batch reactor under long-term exposure to cerium dioxide nanoparticles.
abstract: The performance, microbial enzymatic activity and microbial community of a sequencing batch reactor (SBR) were investigated under long-term exposure to cerium dioxide nanoparticles (CeO2 NPs). The COD removal kept a stable value at 0-5mg/L CeO2 NPs and then decreased at 10-60mg/L CeO2 NPs. The NH4(+)-N removal had no obvious changes at 0-30mg/L CeO2 NPs, and a minor decrease appeared at 60mg/L CeO2 NPs. Compared to 0mg/L CeO2 NPs, the phosphorus removal showed a decrease at 2mg/L CeO2 NPs and slightly increased at 5-60mg/L CeO2 NPs. The nitrogen and phosphorus removal rates had similar variation trends to the microbial enzymatic activities. The variations of reactive oxygen species (ROS) and lactate dehydrogenase (LDH) indicated that high CeO2 NPs concentration could result in the biotoxicity to activated sludge. The presence of CeO2 NPs had obvious effect on the microbial richness and diversity of activated sludge.
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China.
authors: Sen
authors: S
authors: Wang
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China; Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering, Qingdao 266100, China. Electronic address: mengchungao@outlook.com.
authors: Mengchun
authors: M
authors: Gao
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Zhiwei
authors: Z
authors: Li
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Zonglian
authors: Z
authors: She
authors: College of Resource and Environment, Qingdao Agricultural University, Qingdao 266109, China.
authors: Juan
authors: J
authors: Wu
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Dong
authors: D
authors: Zheng
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Liang
authors: L
authors: Guo
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Yangguo
authors: Y
authors: Zhao
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Feng
authors: F
authors: Gao
authors: Key Lab of Marine Environment and Ecology, Ministry of Education, Ocean University of China, Qingdao 266100, China.
authors: Xuejiao
authors: X
authors: Wang
mesh_terms: D000641:Ammonia / Q000378:metabolism; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D002563:Cerium / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D059013:Microbial Consortia / Q000187:drug effects* / Q000502:physiology; D053758:Nanoparticles / Q000633:toxicity*; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D010758:Phosphorus / Q000302:isolation & purification / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D000641:Ammonia; D002563:Cerium; D007770:L-Lactate Dehydrogenase; D009584:Nitrogen; D010758:Phosphorus; D017382:Reactive Oxygen Species; D012722:Sewage; D062065:Wastewater; C030583:ceric oxide
keywords: CeO(2) NPs; LDH and ROS; Microbial activity; Microbial community; Nitrogen and phosphorus rate