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851.
Zhangli Cai George A. Sorial Kai Zhang Pascal Saikaly Maher M. Zein Daniel B. Oerther 《Water, Air, & Soil Pollution: Focus》2008,8(3-4):311-321
Microbial communities in trickle bed air biofilters (TBABs) were evaluated under conditions of interchanging the feed volatile
organic compounds (VOCs) and VOC mixtures. Three independent TBABs (Biofilter “A,” “B,” and “C”) were run under interchanging
VOCs conditions with different initial VOCs. Two aromatic compounds (toluene and styrene) and two oxygenated compounds (methyl
ethyl ketone (MEK) and methyl isobutyl ketone (MIBK)) were interchanged as single solutes. Two other TBABs “D” and “E” were
run for two VOC mixtures. Biofilter “D” had a VOC mixture with equal molar ratio of the four components and Biofilter “E”
received a VOC mixture with its composition based on EPA 2003 emission report. Denaturing gradient gel electrophoresis (DGGE)
analysis of 16S rRNA genes was used to assess the microbial richness in TBABs for treating the VOC mixtures and the impact
of interchanging VOCs on the bacterial community structure in the biofilters. The results from DGGE indicated that the microbial
community structure in the biofilter was different after each interchange of VOCs. Some bands of microbial species faded and
some bands were strengthened. For the two TBABs treating VOC mixtures, the microbial species did not show significant difference,
but the richness among these species was different from each other. 相似文献
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在实验室测定了环嗪酮有不同pH条件下的水解、不同土壤中的降解及其在直径为2cm长为30cm的玻璃管中的淋溶移动情况,试验结果表明,环嗪酮在pH为5、7、9三种不同缓冲溶液中的水解半衰期分别为5179.3、2413.9、866.4天;在东北黑土、江苏黄棕壤、浙江黄壤与江西红壤四种不同土壤中的降解半衰期分别为40.3、9.6、77.1和120.3天;在上述四种土壤中的移动速率次序为东北黑土<江苏黄棕<浙江黄壤<江西红壤。田间试验结果表明,环嗪酮在试验区土壤中的淋溶性能极高,施药后半月内即可淋溶到60~120cm深的土层中,淋溶到60cm以下土层中的量占环嗪酮总使用量的14.7%,在试验区内外的观测井中也检测到它的残留。但其在土壤的消失速率也很快,施药2个月后,在试验区各土层与观测井中均已无残留检出,在试验区环境条件下,它的使用将不会导致对地下水的污染。 相似文献
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正The global and regional redistribution of mercury within the environment is of primary importance to both natural ecosystems and human health.The ratification of the Minamata Convention on Mercury by 91 parties represents a key step in protecting ecosystems and future societies from increasing mercury accumulation.However,key to the continued quanti- 相似文献
859.
Hui Liu Ying Liang Dan Zhang Cheng Wang Hecheng Liang Hesheng Cai 《Waste management (New York, N.Y.)》2010,30(8-9):1569-1576
This study aims to investigate the impact of MSW landfill on the contamination of phthalate esters (PAEs) in nearby environment. Landfill leachate, surface water, groundwater and soil profile samples were collected from a MSW landfill area in Wuhan, China. Contents of 16 PAEs were detected for each sample using gas chromatography method. Results showed that landfill had an obvious effect on the contamination of PAEs in groundwater, whereas showed no tremendous effect on the PAEs contamination in surface water and topsoil. Seven possible transportation processes of PAEs in landfill area were put forward. However, the especially important processes are the invasion of PAEs into aquifer through weathered crevice, horizontal transportation in aquifer and upward infiltration with groundwater. It is suggested that the whole landfill area should be engineered with seepage-proof membrane and clay so as to prevent landfill leachate from flowing out of the filling area. On the other hand, no weathering crevice is permitted in the landfill area as it will affect groundwater seriously. 相似文献
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自焙阳极铝电解槽在生产过程中产生的大量有害气体和粉尘 ,在我国至今没有一种有效的治理方法。我院首次应用电除尘与静电凝聚技术相结合 ,净化自焙阳极铝电解槽生产过程中所产生的有害气体和烟尘获得成功。经国家环保部门测试认定 ,其沥青烟、氟化物和粉尘的排放量均低于国家排放标准。该项技术为我国铝电解行业消除对环境的污染提供了一种最佳的治理方法。介绍了净化工艺原理、实施方法、技术效果与现场运行实测数据 相似文献