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Euiso Choi Daehoon Kim Youngjin Eum Zuwhan Yun Kyong-Sok Min 《Water environment research》2005,77(4):381-389
The nitrogen-removal performances of three full-scale piggery wastewater treatment plants, with different organic and nitrogen loads, at the capacity ranges of 95 to 130 m3/d, were compared in this study. Plants 1 and 2 can be characterized as the modification of anoxic-aerobic operating systems, while an anaerobic and anoxic-aerobic system was used in plant 3. The influent piggery wastewater concentration for plant 1 was relatively lower, but with higher organic and nitrogen loads, resulting in higher chemical oxygen demand (COD) and ammonium-nitrogen in effluent. Plant 2 was operated with strong piggery wastewater, resulting in a higher operating temperature. The high temperature could inhibit the nitrifying activity in plant 2. Although plant 3 was operated with a higher influent total COD-to-total Kjeldahl nitrogen ratio (TCOD:TKN), an additional external carbon source was required to polish the final effluent to remove nitrogen. Influent COD in plant 3 was used in the anaerobic-anoxic reactor for both methane (CH4) production and denitrification. Based on various mass balances, including caloric, COD, and alkalinity, the key elements for the successful nitrogen removal from the piggery waste were reactor temperature (less than 35degrees C), influent TCOD:TKN (greater than 6), and alkalinity-to-TKN ratio (greater than 3). 相似文献
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Eunhwa Choi Heesang Eum Yong-Seok Seo Seung-Muk Yi Hyeyoung Lee 《Journal of Material Cycles and Waste Management》2018,20(2):832-843
Nitrous oxide and carbon dioxide were continuously measured and variability of emission factors (EFs) was evaluated in five municipal waste incinerators (MWIs) and four industrial waste incinerators (IWIs) from 24 to 86 days between 2008 and 2011. N2O EFs were calculated by Monte Carlo simulation and mean N2O EFs were 7.1, 107, 127, 219 g N2O/ton waste combusted in MWIs with selective catalytic reduction (SCR) for NOx control, MWIs with selective non-catalytic reduction (SNCR), IWIs with SNCR, and a MWI using fluidized bed with SNCR, respectively. Climate-relevant CO2 EFs ranged from 0.45 to 0.72 ton CO2/ton waste combusted in MWIs. Maximum values of upper limit for 95% confidence intervals (CIs) of N2O EFs estimated in each MWIs with SCR, MWIs with SNCR, IWIs with SNCR were 185, 94, 101% of mean N2O EFs, respectively. Meanwhile, maximum values of upper limit for 95% CIs of CO2 EFs were much lower as between 18 and 36% in those facilities. 84% CIs of mean N2O EFs in MWIs with SNCR and IWIs with SNCR were overlapped indicating those values are not significantly different. 相似文献
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