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Full-Text Articles in Social and Behavioral Sciences
Simultaneous Nitrification/Denitrification And Trace Organic Contaminant (Troc) Removal By An Anoxic-Aerobic Membrane Bioreactor (Mbr), Hop Phan, Faisal Ibney Hai, Jinguo Kang, Hoa Dam, Ren Zhang, William Price, Andreas Broeckmann, Long Nghiem
Simultaneous Nitrification/Denitrification And Trace Organic Contaminant (Troc) Removal By An Anoxic-Aerobic Membrane Bioreactor (Mbr), Hop Phan, Faisal Ibney Hai, Jinguo Kang, Hoa Dam, Ren Zhang, William Price, Andreas Broeckmann, Long Nghiem
Faisal I Hai
Simultaneous nitrification/denitrification and trace organic contaminant (TrOC) removal during wastewater treatment by an integrated anoxic-aerobic MBR was examined. A set of 30 compounds was selected to represent TrOCs that occur ubiquitously in domestic wastewater. The system achieved over 95% total organic carbon (TOC) and over 80% total nitrogen (TN) removal. In addition, 21 of the 30 TrOCs investigated here were removed by over 90%. Low oxidation reduction potential (i.e., anoxic/anaerobic) regimes were conducive to moderate to high (50% to 90%) removal of nine TrOCs. These included four pharmaceuticals and personal care products (primidone, metronidazole, triclosan, and amitriptyline), one steroid hormone …
Annual Distributions And Sources Of Arctic Aerosol Components, Aerosol Optical Depth, And Aerosol Absorption, Thomas J. Breider, Loretta J. Mickley, Daniel Jacob, Qiaoqiao Wang, Jenny A. Fisher, Rachel Y.-W Chang, Becky Alexander
Annual Distributions And Sources Of Arctic Aerosol Components, Aerosol Optical Depth, And Aerosol Absorption, Thomas J. Breider, Loretta J. Mickley, Daniel Jacob, Qiaoqiao Wang, Jenny A. Fisher, Rachel Y.-W Chang, Becky Alexander
Jenny A Fisher
Radiative forcing by aerosols and tropospheric ozone could play a significant role in recent Arctic warming. These species are in general poorly accounted for in climate models. We use the GEOS-Chem global chemical transport model to construct a 3-D representation of Arctic aerosols and ozone that is consistent with observations and can be used in climate simulations. We focus on 2008, when extensive observations were made from different platforms as part of the International Polar Year. Comparison to aircraft, surface, and ship cruise observations suggests that GEOS-Chem provides in general a successful year-round simulation of Arctic black carbon (BC), organic …
Factors Driving Mercury Variability In The Arctic Atmosphere And Ocean Over The Past 30 Years, Jenny A. Fisher, Daniel J. Jacob, Anne L. Soerensen, Helen M. Amos, Elizabeth S. Corbitt, David G. Streets, Qiaoqiao Wang, Robert M. Yantosca, Elsie M. Sunderland
Factors Driving Mercury Variability In The Arctic Atmosphere And Ocean Over The Past 30 Years, Jenny A. Fisher, Daniel J. Jacob, Anne L. Soerensen, Helen M. Amos, Elizabeth S. Corbitt, David G. Streets, Qiaoqiao Wang, Robert M. Yantosca, Elsie M. Sunderland
Jenny A Fisher
[1] Long-term observations at Arctic sites (Alert and Zeppelin) show large interannual variability (IAV) in atmospheric mercury (Hg), implying a strong sensitivity of Hg to environmental factors and potentially to climate change. We use the GEOS-Chem global biogeochemical Hg model to interpret these observations and identify the principal drivers of spring and summer IAV in the Arctic atmosphere and surface ocean from 1979–2008. The model has moderate skill in simulating the observed atmospheric IAV at the two sites (r ~ 0.4) and successfully reproduces a long-term shift at Alert in the timing of the spring minimum from May to April …