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Compound contamination and secondary ecological effects of Cd and As in soil-alfalfa ecosystems 总被引:11,自引:3,他引:11
CompoundcontaminationandsecondaryecologicaleffectsofCdandAsinsoil-alfalfaecosystems(ZhouQixing;GaoZhengmin)(InstituteofApplie... 相似文献
325.
本文提出了两个治理印染废水的综合物化流程:(1)SE—J型絮凝剂絮凝→气浮→次氯酸钙氧化→炉渣吸附;(2)SE—型絮凝剂絮凝→气浮→活性炭吸附,并对每个处理过程进行了条件实验。实验结果表明:废水经流程(1)处理后,COD去除率达82—87%,色度去除率达88—92%,废水经流程(2)处理后,COD去除率达89—92%,色度去除率达97—98%。经两个流程处理后的出水水质分别接近或达到国家排放标准。 相似文献
326.
Yao Jianren Wang Zhengguo Jiao Shuzhen Zheng Yongquan Zhao Jing Gao Xiwu T. T. Liang 《环境科学学报(英文版)》1992,4(1):106-116
A complete set of procedure for determination of multiresidue of pesticides in vegetables was presented in this paper.The complete set of procedure included three steps:bioassay,cholinesterase inhibition and GLC analysis.The samples could be identified to be contaminated with pesticides if 5% of house flies was knocked down in 50 tested house flies. Those samples contaminated with pesticides needed to be detected by AChE inhibition method.The qualitative and quantitative analyses were carried out by GLC.Recoveries ranged from 83.7% in Chinese cabbages to 105.6% in tomatoes for pyrethroids,and 84.0% in tomatoes to 102.7% in sweetbell redpeppes for organophosphorus compounds.Coefficients of variations ranged from 0.59% to organophosphorus compounds.Coefficients of variations ranged from 0.59% to 7.87% for pyrethroids. and 0.33% to 9.88% for organophosphorus compounds with vegetables. The complete set of procedure has been used successfully to analyze 7000 samples collected in Beijing. About 1% of the samp 相似文献
327.
在探讨电力需求侧管理理论,方法以及电力经济结构和电力与环境问题的基础上,分析评价电力需求侧管理对可持续发展的作用贡献,电力需求侧管理是促进系统可持续发展的战备途径之一。 相似文献
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本文根据前屯煤矿矿井水排放规律和原水水质特征,采用KJS型一体化净水器,锰砂除铁滤器及消毒等处理工艺,处理后水质完全达到国家饮用水标准,工程投资和运行费用均较合理。 相似文献
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Escherichia coli (E. coli) and Bacillus megaterium bacteria were frozen at -15 degrees C using a freezer and a spray freezing method. The frozen Bacillus spores were also exposed to UV and free chlorine. An average of 4.7-log inactivation was obtained from the spray ice with 2-day storage time, while the freezer freezing only caused 0.84-log reduction with the same storage time. Significantly higher inactivation levels were observed for the E. coli cells with 2-day storage compared with those without storage. The spray freezing was found more effective in killing the E. coli cells, while more cells were sublethally injured by the freezer freezing. Freezing did not kill the Bacillus megaterium spores, but affected their response to UV and chlorine. Greater inactivation levels were observed at higher free chlorine doses or longer contact time, and the UV fluence-response curve showed initial rapid kill followed by tailing for the frozen spores. 相似文献
330.
Photodegradation of surfactants on the nanosized TiO2 prepared by hydrolysis of the alkoxide titanium 总被引:3,自引:0,他引:3
Nanosized TiO(2) was synthesized by hydrolysis of titanium tetraisopropoxide in the nanodroplets of microemulsions. The microemulsion provided by functionalized surfactants derived from the mixture of the commercially available sodium dodecylbenzensulfonate (DBS) and sodium dodecyl sulfate (DS). The resulting TiO(2) nanoparticles were characterized by transmission electron microscopy, X-ray diffraction, and differential thermal analysis. Nanosized TiO(2) of anatase was found to show good photocatalytic properties in the photodegradation of DBS and DS surfactants. The cleavage of the aromatic moiety, the intermediate products and ultimate mineralization to CO(2) were examined in the process of photodegradation. A mechanism is also proposed on the basis of these experimental results. 相似文献