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361.
362.
Hong Yuanfan Zhou Jin Hong Qing Wang Qian Jiang Jiandong Li Shunpeng 《Journal of environmental management》2010,91(11):2295-2300
A gram-negative fenpropathrin-degrading bacterial strain Sphingobium sp. JQL4-5 was isolated from the wastewater treatment sludge of an insecticide factory. Strain JQL4-5 showed the ability to degrade other pyrethroid insecticides, but it was not able to degrade methyl parathion. To enhance its degrading range of substrate, a methyl parathion hydrolase gene (mpd) was successfully introduced into the chromosome of strain JQL4-5 with a mini-Tn-transposon system. A genetically engineered microorganism (GEM) named JQL4-5-mpd resulted, which was capable of simultaneously degrading methyl parathion and fenpropathrin. Soil treatment results indicated that JQL4-5-mpd is a promising multifunctional bacterium in the bioremediation of multiple pesticide-contaminated environments. 相似文献
363.
Field measurements of salinity, wind and river discharge and numerical simulations of hydrodynamics from 1978 to 1984 are
used to investigate the dynamics of the buoyant plume off the Pearl River Estuary (PRE), China during summer. The studies
have shown that there are four major horizontal buoyant plume types in summer: Offshore Bulge Spreading (Type I), West Alongshore
Spreading (Type II), East Offshore Spreading (Type III), and Symmetrical Alongshore Spreading (Type IV). River mouth conditions,
winds and ambient coastal currents have inter-influences to the transport processes of the buoyant plume. It is found that
all of the four types are surface-advected plumes by analysing the vertical characteristic of the plumes, and the monthly
variations of the river discharge affect the plume size dominantly. The correlation coefficient between the PRE plume size
and the river discharge reaches 0.85 during the high river discharge season. A wind strength index has been introduced to
examine the wind effect. It is confirmed that winds play a significant role in forming the plume morphology. The alongshore
wind stress and the coastal currents determine the alongshore plume spreading. The impact of the ambient currents such as
Dongsha Current and South China Sea (SCS) Warm Current on the plume off the shelf has also assessed. The present study has
demonstrated that both the river discharge and wind conditions affect the plume evolution. 相似文献
364.
Stefan Bachu Mehran Pooladi-Darvish Huifang Hong 《International Journal of Greenhouse Gas Control》2009,3(4):468-473
Laboratory experiments reported in a companion paper were carried out to examine the chromatographic partitioning of impurities contained in a stream of CO2 injected into a deep saline aquifer. The solubility of the impurity gas in the CO2 stream compared to that of CO2, the in situ conditions of pressure, temperature and water salinity, and the concentration of the impurity gas affect the partitioning of the two gases. For CO2 streams containing H2S, numerical simulations reported here have successfully replicated the laboratory results including the breakthrough of CO2 ahead of H2S. Sensitivity analysis performed with the numerical model has shown that flow conditions, controlled by such parameters as medium permeability, pressure gradient, dispersion, gas mobility and flow direction, affect the breakthrough time and separation of the two gases, leading to delayed or earlier breakthrough, and increasing or decreasing the time lag between the breakthrough of the two gases. Vertical bottom-up flow leads to earlier breakthrough, while top-down flow leads to delayed breakthrough. These results are important in establishing monitoring strategies at CO2 storage sites and in evaluating the risks associated with the possible leakage of injected CO2 that contains impurities. 相似文献
365.
A dynamic flux chamber has been used to estimate fluxes of mercury over different types of surfaces in an abandoned open‐cut mine of Tongren prefecture, Guizhou province, China during spring and summer of 1996. The highest fluxes were obtained over cinnabar slag and contaminated soils, whereas the emissions above cinnabar ore were substantially lower. These fluxes was scaled up to estimate the contribution of mercury emissions to air from mercury wastes, compared to anthropogenic activities in the province of Guizhou, China. Atmospheric mercury concentrations measured were enhanced in the mining area (<1.3 μg m‐3) compared to regional background sites (1.8–5.1 ng m‐3). The spreading of mercury was estimated by using biological and geological samples. Moss bags have been employed to estimate long‐time dry‐ and wet‐deposition to this area. 相似文献
366.
土壤中三聚氰胺的降解动态与两种蔬菜的吸收效应研究 总被引:1,自引:0,他引:1
以青菜和马铃薯为供试蔬菜,在建立蔬菜中三聚氰胺液相色谱串联质谱(LC-MS-MS)测定方法的基础上,采用N15同位素稀释法,通过在土壤中添加三聚氰胺进行盆栽试验,研究了三聚氰胺在土壤中的降解动态及两种蔬菜的吸收效应.结果表明,土壤中三聚氰胺降解速率随着土壤中三聚氰胺质量比的增加而变慢,20d以后,降解曲线平缓,速度缓慢,残留时间延长,其降解动态符合Logistic方程.同位素稀释法证实两种蔬菜均可以吸收土壤中的三聚氰胺.当土壤中含有50 mg/kg和100 mg/kg三聚氰胺时,马铃薯的吸收量分别比青菜高4.4和2.1倍.青菜根部对三聚氰胺的吸收高于茎叶.高质量比三聚氰胺对蔬菜生长具有明显的抑制效应. 相似文献
367.
本文计算和分析了冲击实验装置运行对环境造成的振动干扰,所用数据为实测分析参数,计算结果表明,冲击实验装置在运行期间对周围环境造成的振动影响是可接受的。 相似文献
368.
369.
ThewesternregionsofChina (orWestChina)include 1 2 provinces/autonomousre gions/municipalities:Qinghai,Gansu ,Shaanxi,Sichuan ,Yunnan ,Guizhou ,Xinjiang ,Ti bet ,Ningxia ,Guangxi,InnerMongoliaandChongqing .SincethePleistoceneoftheQuater naryPeriod ,themountainsinthewe… 相似文献
370.
低温湿式空气氧化法处理废碱液的研究 总被引:18,自引:0,他引:18
对采用低温湿式空气氧化法处理炼油和乙烯废碱液进行了研究。考察了停留时间对废碱液中硫化物的氧化、氧化产物的形态、COD和酚去除率的影响,反应温度对废碱液中污染物氧化反应的影响。试验结果表明,废碱液的脱臭效果很好,S^2-的氧化产物以S2O3^2-和SO4^2-2种形式共存;酚、COD的去除率及S^2-的氧化反应停留时间影响小,受反应温度影响明显;废碱液的S^2-的酚浓度相当时,COD去除率一 般低于40%, 废碱液的S^2-浓度远大于酚浓度时,废碱液的COD去除率为40%-70%;废碱液中酚的质量浓度大于20000mg/L时才有回收价值。 相似文献