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261.
Michael Süß Alex De Visscher 《Journal of the Air & Waste Management Association (1995)》2013,63(9):1107-1115
The occurrence of multiple steady states in a toluene biodegrading, diffusion-limited biofilm under aerobic conditions was investigated by computer models: one steady-state, and one nonsteady-state. Two stable and one unstable intermediate steady-state were identified in a narrow set of combinations of parameters values. The nonsteady-state model predicts conditions that evolve to a steady state that is within 0.02–1% of the solution of the steady-state model, depending on the number of grid points used, confirming the algorithms are valid. Multiple steady states occur if, (1) a biofilm is exposed to a constant gas-phase pollution concentration, which exceeds or undershoots a certain threshold, (2) in a narrow range of parameter values and (3) provided that the pollutant degradation follows Haldane kinetics. Such a biofilm displays half-saturation (i.e., Michaelis-Menten)-like apparent (“falsified”) kinetics from a concentration range starting at zero up to the occurrence of a second steady state. Multiple steady states and falsified kinetics can negatively affect a biofilter and the experimental determination of kinetic parameters, respectively.Implications: The occurrence of multiple steady states in a VOC treating biofilm, shows the significant impact of degradation kinetics and diffusion limitation on the biofilm behavior. Moreover, the implied possible sudden drop of removal efficiency of a biofilter, based on the occurrence of multiple steady states lead to possible bottle-necks in biofilter application and operation. 相似文献
262.
Alex R. Gholson Julia F. Storm R. K. M. Jayanty Robert G. Fuerst Thomas J. Logan M. Rodney Midgett 《Journal of the Air & Waste Management Association (1995)》2013,63(9):1210-1217
Regulation to control air emissions of toxic organic compounds require the collection and analysis of effluent gas from low level sources such as hazardous waste incinerators. The standard SW- 846 Method specifies the use of Tenax and Tenax/charcoal adsorbent traps for collection of volatile organics from incinerators. This study evaluates passivated stainless steel canisters as an alternative to adsorbent traps to eliminate some of the problems associated with adsorbent sampling. Initially the stability of 18 nonpolar, volatile organic compounds was determined in Summa-treated stainless steel canisters with greater than 100 ppmv HCI and saturated with water vapor. All 18 components were stable for a twoweek period; however, an Interference caused a 10-fold increase In the FID response of trlchloroethylene, toluene, and chlorobenzene. No Interference of the ECD response was found for any of the 11 compounds detected with the ECD including trlchloroethylene. A pilot scale incinerator was sampled using canisters, and the destruction efficiency of 1,1,1-trichloroethane was determined at a concentration of less than 0.5 ppbv while determining 1,1-dichloroethylene, the major product of Incomplete combustion, at a concentration of 8000 ppbv from the same sample. 相似文献
263.
Alex Lockwood 《Environmental Communication: A Journal of Nature and Culture》2016,10(6):734-748
ABSTRACTHow can theories of affect and felt emotions be useful in studying the communication of environmental crises? Beginning from tears spilt over a graph of transgressed planetary boundaries published in an academic paper, this article explores the presentation in graphic visual forms of affective imagery and a growing sophistication amongst scientists, policymakers and activist communicators in the visualization of information, data and stories employed to carry the often difficult and complex messages of current earth systems crises. Critically, this article attends to the “emotion work” of such images. Taking a lead from cultural sociology and attempting to elucidate the relationship between societies under pressure and its choice of texts, this article considers the environmental documentary Cowspiracy [Anderson, K., & Kuhn, K. (2014). Cowspiracy. San Francisco, CA: AUM Films & First Spark Media.] to ask questions of affect’s relation to expressions of the earth systems crisis, which is also a crisis of culture. 相似文献
264.
265.
Islam Md Tasbirul Huda Nazmul Baumber Alex Hossain Rumana Sahajwalla Veena 《Environmental science and pollution research international》2022,29(39):58980-59001
Environmental Science and Pollution Research - Consumer behavior is a critical consideration for the development of sustainable waste management systems, including waste batteries, which pose a... 相似文献
266.
Adebayo Tomiwa Sunday Acheampong Alex O. 《Environmental science and pollution research international》2022,29(7):9867-9882
Environmental Science and Pollution Research - Sustainable development policies for achieving net-zero emissions require understanding the factors that influence carbon emissions. Capitalizing on... 相似文献