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71.
Yoon Sanghyuck Choi Wonyoung Jeon Chansoo 《Journal of Material Cycles and Waste Management》2022,24(5):1878-1892
Journal of Material Cycles and Waste Management - The hydration characteristics of mixed cement containing fine powder of blast-furnace slag and expandable material were examined by X-ray... 相似文献
72.
Pal R Kim KH Jeon EC Song SK Shon ZH Park SY Lee KH Hwang SJ Oh JM Koo YS 《Environmental monitoring and assessment》2009,148(1-4):109-125
The atmospheric concentrations of several reduced sulfur compounds (RSCs) including H(2)S, CH(3)SH, DMS, CS(2), and DMDS were measured concurrently from a series of field campaigns covering multiple locations in the surroundings of a large industrial region (August 2004 to September 2005). These field studies have been designed and undertaken to inspect the concentrations of RSCs in ambient air. The RSC concentrations were found to occur in a highly variable range. H(2)S (1.06 +/- 2.07 ppb) was found to be the most abundant RSC followed by CS(2) (0.84 +/- 0.54 ppb), DMDS (0.36 +/- 1.21 ppb), DMS (0.24 +/- 0.83 ppb), and CH(3)SH (0.11 +/- 0.23 ppb). The RSC levels measured at the study area were comparable to those observed previously from other polluted environmental settings. When these RSC data were examined further in terms of spatial (industrial vs. non-industrial sites) and seasonal (summer vs. winter seasons) grouping schemes, differences in their concentration levels were statistically insignificant in most cases. In contrast, there were fairly strong variations in temporal patterns over a diurnal cycle. If these RSC concentration data were converted to diagnose the malodor strengths, their effects were in most cases insignificant with minor contribution towards odor nuisances. 相似文献
73.
In this study, a new empirical equation for the transverse dispersion coefficient has been developed based on the hydraulic
and geometric parameters in natural streams using a regression technique. First, a total of 32 data sets in 16 streams were
collected. Among those sets, 16 sets were used for deriving the new equation, and the other 16 sets were used for verifying
the equation. Then, through dimensional analysis, it was found that the normalized transverse dispersion coefficient is associated
with several parameters such as sinuosity, aspect ratio, and a friction term. The robust least square method was applied to
estimate regression coefficients. The newly proposed equation was proven to be superior in explaining the dispersion characteristics
of natural streams more precisely compared to the existing equations. 相似文献
74.
Removal efficiencies of PCDDs/PCDFs by air pollution control devices in municipal solid waste incinerators 总被引:5,自引:0,他引:5
Kim SC Jeon SH Jung IR Kim KH Kwon MH Kim JH Yi JH Kim SJ You JC Jung DH 《Chemosphere》2001,43(4-7):773-776
Removal efficiencies of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) by air pollution control devices (APCDs) in the commercial-scale municipal solid waste (MSW) incinerators with a capacity of above 200 ton/day were evaluated. The removal efficiencies of PCDDs/PCDFs were up to 95% when the activated carbon (AC) was injected in front of electrostatic precipitator (EP). Spray dryer absorber/bag filter (SDA/BF) had high removal efficiency (99%)) of PCDDs/PCDFs when a mixture of lime and AC was sprayed into the SDA. When the AC was not added in scrubbing solution, the whole congeners of PCDDs/PCDFs were enriched in the wet scrubber (WS) with negative removal efficiencies of -25% to -5731%. Discharge of PCDDs/PCDFs was decreased with increasing the proportions of AC added in scrubbing solution. Selective catalytic reduction (SCR) system had the removal efficiencies of up to 93% during the test operation. 相似文献