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61.
62.
A technical and economic comparison of biofiltration and wet chemical oxidation (scrubbing) for odor control at wastewater treatment plants 总被引:2,自引:0,他引:2
Li Gao Tim C. Keener Lian Zhuang Kaniz F. Siddiqui 《Environmental Engineering and Policy》2001,2(4):203-212
An economic and technical comparison of two odor control systems, a biofilter and a chemical wet scrubber, was conducted over a 1-year time period at a large municipal wastewater treatment plant. The biofilter system was designed to remove hydrogen sulfide gas and other oxidizable sewage odors from four covered gravity sludge thickeners, a gravity sludge thickener effluent channel and an influent splitter box for the gravity sludge thickeners. The sodium hypochlorite/sodium hydroxide wet scrubber was designed to control hydrogen sulfide gas and other oxidizable sewage odors from the covered primary settling tanks, influent distribution channels and effluent channel, and the mixing tank effluent channel. The technical comparison comprised their overall removal rates and efficiencies based on inlet H2S concentrations and other operating variables. The economic comparison was designed to provide the cost per cubic meter of H2S removed for each system. Influent and effluent gas samples were collected on a weekly basis. H2S concentration levels were determined through the use of gas chromatography with a flame photometric detector. The results showed that the H2S inlet gas concentration has a seasonal change with a maximum value occurring in August and September. The effluent H2S concentration was lower than 2 ppmv for both systems for most of the samples. The efficiency for both the biofilter and wet scrubber was above 95%, and was related to the operating and ambient conditions. The economic comparison revealed that the actual unit cost for the biofilter was higher than for the wet scrubber (U.S.160 /m < SUP > 3 < /SUP > H < SUB > 2 < /SUB > S removed versus U.S.160 /m3 H2S removed versus U.S.131 /m3 H2S removed). For both the biofilter and the wet scrubber, the investment costs are affected by the size/scale of the system, the design flow and other factors. For these systems, the mulch change costs, chemical usage costs, maintenance costs and power usage costs were mainly dependent on the actual odor gas loadings which showed substantial seasonal fluctuations as a function of the seasonal temperature. The worst case conditions reported here indicate that the H2S concentrations generated during the summer months should be used to determine the design load. 相似文献
63.
Hafeez Muhammad Ullah Farman Khan Muhammad Musa Wang Zhangqian Gul Hina Li Xiaowei Huang Jun Siddiqui Junaid Ali Qasim Muhammad Wang Rui-Long Imran Muhammad Assiri Mohammed A. Rehman Muzammal Fahad Shah Lu Yaobin 《Environmental science and pollution research international》2022,29(40):60198-60211
Environmental Science and Pollution Research - Many species of devastating insect pests have acquired a high degree of resistance to insecticides in the field during the last few decades.... 相似文献
64.
Green product design in a supply chain with considering marketing under competition and coordination
Fadavi Ahmad Jolai Fariborz Taleizadeh Ata Allah 《Environment, Development and Sustainability》2022,24(10):11721-11759
Environment, Development and Sustainability - Environmental sustainability is becoming a leading indicator for evaluating supply chain management. This study considers two players, a manufacturer... 相似文献
65.
Dabaghian Neda Tavakkoli-Moghaddam Reza Taleizadeh Ata Allah Moshtagh Mohammad Sadegh 《Environment, Development and Sustainability》2022,24(3):3165-3197
Environment, Development and Sustainability - By developing markets and increasing world competition, today, companies' success is not only related to their performance but also the interaction... 相似文献