PMID- 22704928
OWN - NLM
STAT- MEDLINE
DCOM- 20121030
LR  - 20131121
IS  - 1879-2448 (Electronic)
IS  - 0043-1354 (Linking)
VI  - 46
IP  - 14
DP  - 2012 Sep 15
TI  - Alumina nanoparticles-induced effects on wastewater nitrogen and phosphorus 
      removal after short-term and long-term exposure.
PG  - 4379-86
LID - 10.1016/j.watres.2012.05.042 [doi]
AB  - Alumina nanoparticles (Al(2)O(3) NPs) have been widely used in many fields, which 
      causes a growing concern about their potential health and environmental risks. 
      However, their possible impacts on wastewater nitrogen and phosphorus removal 
      have not yet been reported. In this study, both short-term and long-term effects 
      of Al(2)O(3) NPs on wastewater nutrient removal were investigated. Scanning electron 
      microscope (SEM) analysis showed that most of Al(2)O(3) NPs were adsorbed onto 
      activated sludge, but these NPs had no adverse effects on the surface integrity 
      and viability of activated sludge. It was found that short-term exposure to 1 and 
      50 mg/L Al(2)O(3) NPs induced marginal influences on wastewater nitrification, 
      denitrification and phosphorus removal. Nevertheless, the prolonged exposure to 
      50 mg/L Al(2)O(3) NPs was observed to decrease the total nitrogen (TN) removal 
      efficiency from 80.4% to 62.5% due to the suppressed denitrification process, 
      although biological phosphorus removal and the transformations of intracellular 
      polyhydroxyalkanoates and glycogen were not affected. Quantitative PCR assays 
      indicated that compared with the control, 50 mg/L Al(2)O(3) NPs decreased the 
      abundance of denitrifying bacteria in activated sludge. Further enzyme activity 
      tests showed that the activities of key denitrifying enzymes (nitrate reductase 
      and nitrite reductase) were inhibited, which might be responsible for the 
      negative effects of 50 mg/L Al(2)O(3) NPs on wastewater nitrogen removal after 
      long-term exposure.
CI  - Copyright (c) 2012 Elsevier Ltd. All rights reserved.
FAU - Chen, Yinguang
AU  - Chen Y
AD  - State Key Laboratory of Pollution Control and Resources Reuse, School of 
      Environmental Science and Engineering, Tongji University, 1239 Siping Road, 
      Shanghai 200092, China.
FAU - Su, Yinglong
AU  - Su Y
FAU - Zheng, Xiong
AU  - Zheng X
FAU - Chen, Hong
AU  - Chen H
FAU - Yang, Hong
AU  - Yang H
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20120531
PL  - England
TA  - Water Res
JT  - Water research
JID - 0105072
RN  - 0 (Sewage)
RN  - 0 (Water Pollutants, Chemical)
RN  - 27YLU75U4W (Phosphorus)
RN  - EC 1.1.1.27 (L-Lactate Dehydrogenase)
RN  - LMI26O6933 (Aluminum Oxide)
RN  - N762921K75 (Nitrogen)
SB  - IM
MH  - Adsorption
MH  - Aluminum Oxide/*chemistry
MH  - Bacteria/metabolism
MH  - Biodegradation, Environmental
MH  - Denitrification
MH  - L-Lactate Dehydrogenase/metabolism
MH  - Nanoparticles/*chemistry/ultrastructure
MH  - Nitrogen/*isolation & purification
MH  - Phosphorus/*isolation & purification
MH  - Sewage/chemistry/microbiology
MH  - Time Factors
MH  - *Waste Disposal, Fluid
MH  - Water Pollutants, Chemical/*isolation & purification
MH  - Water Purification/*methods
EDAT- 2012/06/19 06:00
MHDA- 2012/10/31 06:00
CRDT- 2012/06/19 06:00
PHST- 2012/04/01 00:00 [received]
PHST- 2012/05/22 00:00 [revised]
PHST- 2012/05/23 00:00 [accepted]
PHST- 2012/06/19 06:00 [entrez]
PHST- 2012/06/19 06:00 [pubmed]
PHST- 2012/10/31 06:00 [medline]
AID - S0043-1354(12)00380-6 [pii]
AID - 10.1016/j.watres.2012.05.042 [doi]
PST - ppublish
SO  - Water Res. 2012 Sep 15;46(14):4379-86. doi: 10.1016/j.watres.2012.05.042. Epub 
      2012 May 31.