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441.
The cometabolic roles of glucose were investigated in decolorization of an azo dye, Reactive Black 5, by yeast isolates, Debaryomyces polymorphus and Candida tropicalis. The results indicated that the dye degradation by the two yeasts was highly associated with the yeast growth process and glucose presence in the medium. Color removal of 200 mg dye/L was increased from 76.4% to 92.7% within 60 h to 100% within 18-24 h with the increase of glucose from 5 to 10 g/L, although the activity of manganese dependent peroxidase (MnP) decreased by 2-8 times in this case. Hydrogen peroxide of 233.3 μg/L was detected in 6 h in D. polymorphus culture. The cometabolic functions of glucose and hydrogen peroxide could be also confirmed by the further color removals of 95.8% or 78,9% in the second cycle of decolorization tests in which 7 g glucose/L or 250 μg H202/L was superadded respectively together with 200 mg dye/L. 相似文献
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一起氯乙烯压缩机缸盖破裂事故分析 总被引:1,自引:0,他引:1
金浩 《安全.健康和环境》2008,8(8)
采用故障树分析法剖析了引起氯乙烯气体压缩机缸盖破裂的因素,根据现场查证掌握的信息,分析确定了事故的原因、爆炸着火的源点及引爆源,提出了防止氯乙烯气体压缩机类似事故的安全措施。 相似文献
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本文对安徽测震台网的系统构成、子台分布、地震设备情况、传输信道、台网的技术系统功能进行了介绍。安徽测震台网部的建成,使得地震监控能力得到更大的提升,在安徽省地震应急中必将发挥积极的作用。 相似文献
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安普霉素生产废水是一种抗生素类废水,内含多种难降解的生物毒性物质,处理难度大,经查阅国内外抗生素类废水处理技术资料,并进行大量对比试验,确定采用铁碳内电解预处理-厌氧-好氧-气浮处理工艺。应用铁碳内电解法对安普霉素生产废水进行毒性去除及污染物处理,有效地提高了废水的可生化性,保证了后续厌氧生物处理和好氧生物处理设施的稳定运行。出水达到了GB8978-1996的二级排放要求。 相似文献
448.
Xiao WANG Fanghua HAO Xuan ZHANG Wen SUN Hongguang CHENG 《Frontiers of Environmental Science & Engineering in China》2008,2(3):318-325
Environmental risk of high sulfur gas field exploitation has become one of the hot spots of environmental management studies.
Severe gas H2S blowout accidents in recent years have shown that poor understanding and estimates of the poisonous gas movement could lead
to dangerous evacuation delays. It is important to evaluate the real concentration of H2S, especially in complex terrain. Traditional experiential models are not valid in the case of rough terrain, especially in
low-lying areas where the gas accumulates. This study, using high sulfur content gas field of Sichuan “Pu Guang gas field”
as study object and adopting objective diagnosis of wind field of land following coordinate three dimensions, applied Lagrangian
Puff Model and breaking up technique of puffs to simulate the H2S diffusion condition of blowout accidents produced in the high sulfur content gas field of complex terrain area. The results
showed that the H2S distribution did not occur mainly in low wind direction, and due to the obstruction of the mountain’s body, it accumulated
in front of mountain on produced turn over, flowed around submitted jumping type distribution. The mountain waist near the
hilltop and low hollow river valley site rapture points simulating contrast showed that the higher the rapture point, the
better the diffusing condition of pollutant, the distribution of risk sensitive point decided piping rupture environmental
risk size combining the H2S diffusion result and residential area dispersing in the study area, synthetic judge located in the high rapture point environmental
risk was smaller than the low hollow point, thus it was suggested to carryout laying of lining build of equal high line of
higher terrain. According to simulation results, the environmental risk management measures aimed at putting down adverse
effects were worked out. 相似文献
449.
灰场评价是电厂环境影响评价中非常重要的部分,粉煤灰的性质,决定了空气环境影响评价在贮灰场的评价中具有重要的地位和作用。而贮灰场源强的计算,则是贮灰场空气评价的关键。本文结合实际工作,从贮灰场空气污染源产生环节分析入手,结合已有资料,分别讨论了干式贮灰场空气污染源中表层起尘量和自卸汽车卸料起尘量的影响因素及源强计算,并根据其影响因素,总结了贮灰场空气污染防治措施的一些要点,希望对广大环评工作者有所裨益。 相似文献
450.