Bio-removal of mixture of benzene, toluene, ethylbenzene, and xylenes/total petroleum hydrocarbons/trichloroethylene from contaminated water

Four pure cultures were isolated from soil samples potentially contaminated with gasoline compounds either at a construction site near a gas station in Fai Chi Kei, Macau SAR or in the northern parts of China (Beijing, and Hebei and Shandong). The e ects of di erent concentrations of benzene, toluene, ethylbenzene, and three isomers (ortho-, meta-, and para-) of xylene (BTEX), total petroleum hydrocarbons (TPH), and trichloroethylene (TCE), when they were present in mixtures, on the bio-removal e ciencies of microbial isolates were investigated, together with their interactions during the bio-removal process. When the isolates were tested for the BTEX (50–350 mg/L)/TPH (2000 mg/L) mixture, BTEoX in BTEoX/TPH mixture was shown with higher bio-removal e ciencies, while BTEmX in BTEmX/TPH mixture was shown with the lowest, regardless of isolates. The TPH in BTEmX/TPH mixture, on the other hand, were generally shown with higher bio-removal e ciencies compared to when TPH mixed with BTEoX and BTEpX. When these BTEX mixtures (at 350 mg/L) were present with TCE (5–50 mg/L), the stimulatory e ect of TCE toward BTEoX bio-removal was observed for BTEoX/TCE mixture, while the inhibitory e ect of TCE toward BTEmX for BTEmX/TCE mixture. The bio-removal e ciency for TPH was shown lower in TPH (2000 mg/L)/TCE (5–50 mg/L) mixtures compared to TPH present alone, implying the inhibitory e ect of TCE toward TPH bio-removal. For the mixture of BTEX (417 mg/L), TPH (2000 mg/L) along with TCE (5– 50 mg/L), TCE was shown co-metabolically removed more e ciently at 15 mg/L, probably utilizing BTEX and/or TPH as primary substrates.     

室内空气污染的来源及控制措施

随着经济的发展和人们生活水平的提高,室内空气污染逐渐成为人们关心的环境问题之一。室内空气污染物包括悬浮固体污染物和气体污染物,其中可吸入颗粒物对人体呼吸系统有极大危害;气体污染物主要包括有机气体污染物、无机气体污染物和放射性气体污染物,它们可以引起病态建筑综合症（SBS）、化学物质过敏症等相关病症。本文分析了各种室内空气污染的来源,并据此提出室内空气污染的防控措施。     

新型灾害催生新型管理机制

2008年初,我国南方大部分省份发生了严重的低温雨雪冰冻灾害,造成了巨大的损失。本文运用灾害学的基本理论分析这场灾害,发现它有许多不同于以往自然灾害的新特点。结合风险管理的理论同时参考国外风险与灾害管理的经验,作者认为政府应该在综合风险防范的基础上进行灾害管理,提出了政府成立综合风险与灾害应急管理常设机构以应对类似灾害的建议。     

Measuring environmental efficiency and technology inequality of China’s power sector: methodological comparisons among data envelopment analysis,free disposable hull,and super free disposable hull models

Environmental Science and Pollution Research - China’s power sector has received great research attention because of its large energy consumption and CO2 emissions. This study assesses the...     

新疆油田含油污泥特性研究

含油污泥是油田企业生产过程中的主要污染源之一,文章对原油处理系统及采出水处理系统的含油污泥进行了理化性质及成分的分析检测,结果表明:油田污泥中植物营养成分含量较低;重金属含量较低,低于GB4284-84《农用污泥中污染物控制标准》。通过对其特性的系统分析,发现油田污泥的一些共性,为其"减量化、资源化、无害化"提供了基础资料。