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21.
Itoh K Mihara Y Toshima Y Suyama K 《Journal of environmental science and health. Part. B》2011,46(2):181-190
Monochlorophenols were degraded to benzoate via phenol by the initial dechlorination and the subsequent conversion of phenol to benzoate in anaerobic sediment samples of estuarine Lake Shinji under methanogenic conditions. To characterize bacteria that dechlorinate 4-chlorophenol and transform phenol to benzoate, we analyzed the microbial community structure of the enrichment culture with each 4-chlorophenol and phenol by the limiting dilution method with polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) of 16S rRNA gene. After serial dilution of the culture, the 4-chlorophenol-dechlorinating culture consisted of two dominant bacteria, one of which was most homologous with Dehalobacter sp. In the enriched culture with phenol, minor band homologous with Cryptanaerobacter phenolicass corresponded to the transformation activity. 相似文献
22.
Eiko Obuchi Masaki Suyama Katsuyuki Nakano 《Journal of Material Cycles and Waste Management》2001,3(2):88-92
The catalytic decomposition of mixed plastics consisting of polypropylene (PP) and polyethylene terephthalate (PET) has been
investigated over titania/silica catalysts at 698 K. The yield of oil produced was about 70%, and the large amounts of C18+ hydrocarbons this contained was from the aromatics in PET. Gas was also produced, including C3–C5 hydrocarbons. The carbon-number fractions in the oil was influenced by the PET/(PP + PET) ratios and the catalyst weight.
The titania/silica catalysts could be used repeatedly, and after they had been fouled, could be regenerated. From the Fourier
Transform Infrared (FT–IR) spectroscopic data of adsorbed pyridine on the catalyst surface, most of the acid sites of the
titania/silica catalysts were found to be Lewis sites where the hydride abstracted from PP pyrolysates react with PET pyrolysates
to form oil and gas.
Received: July 19, 2000 / Accepted: October 20, 2000 相似文献
23.
Richard Lowrance Lee S. Altier J. Denis Newbold Ronald R. Schnabel Peter M. Groffman Judith M. Denver David L. Correll J. Wendell Gilliam James L. Robinson Russell B. Brinsfield Kenneth W. Staver William Lucas Albert H. Todd 《Environmental management》1997,21(5):687-712
/ Maryland, Virginia, and Pennsylvania, USA, have agreed to reduce nutrient loadings to Chesapeake Bay by 40% by the year 2000. This requires control of nonpoint sources of nutrients, much of which comes from agriculture. Riparian forest buffer systems (RFBS) provide effective control of nonpoint source (NPS) pollution in some types of agricultural watersheds. Control of NPS pollution is dependent on the type of pollutant and the hydrologic connection between pollution sources, the RFBS, and the stream. Water quality improvements are most likely in areas of where most of the excess precipitation moves across, in, or near the root zone of the RFBS. In areas such as the Inner Coastal Plain and Piedmont watersheds with thin soils, RFBS should retain 50%-90% of the total loading of nitrate in shallow groundwater, sediment in surface runoff, and total N in both surface runoff and groundwater. Retention of phosphorus is generally much less. In regions with deeper soils and/or greater regional groundwater recharge (such as parts of the Piedmont and the Valley and Ridge), RFBS water quality improvements are probably much less. The expected levels of pollutant control by RFBS are identified for each of nine physiographic provinces of the Chesapeake Bay Watershed. Issues related to of establishment, sustainability, and management are also discussed.KEY WORDS: Riparian forest buffers; Chesapeake Bay; Nonpoint source pollution; Nitrogen; Phosphorus; Sediment 相似文献
24.
Ultra Venecio U. Tirivarombo Sithabile Toteng Ogomoditse Ultra Wendell 《Environmental science and pollution research international》2022,29(40):60054-60066
Environmental Science and Pollution Research - This study was carried out to determine the effect of cow manure amendment and the method of planting on the growth, survival, and heavy metal... 相似文献
25.
Carvalho Barros Giselle Kalline Gomes Duarte Lindemberg Jesus Nogueira Melo Ricardo Paulo Fonseca Lopes Francisco Wendell Bezerra Barros Neto Eduardo Lins 《Journal of Polymers and the Environment》2022,30(6):2534-2546
Journal of Polymers and the Environment - The environmental impacts caused by dyes in industrial wastewater are incalculable, due to their adverse effects on the ecosystem and human life,... 相似文献