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171.
香烟中含有的氟在燃烧下会有一部分随着烟气被消费者吸入体内,对人体的健康造成危害,。若每人每天吸烟20支,则其每天从香烟吸摄的氟大约为50微克。 相似文献
172.
减少硫磺回收装置的SO2排放 总被引:4,自引:0,他引:4
针对硫磺回收装置SO2排放不能满足GBl6297—1996的现状,具体分析了本装置减少SO2排放的相关方法。 相似文献
173.
苏州河截流区外非点源污染调查 总被引:9,自引:2,他引:9
为了摸清苏州河截流区外的污染物量以及对苏州河下游段水质的影响,为苏州河截流污水工程的运行和进一步治理提供科学依据,采用美国环保局的非点源负荷函数和城区污染物流失量负荷模型等方法,对苏州河截流区外(黄渡—北新泾区段)地表径流等非点源污染负荷进行全面调查。结果表明:(1)非点污染源是目前苏州河截流区外最主要的污染源;其中,畜牧业污染为本区最大的非点污染源。(2)北新泾断面是本区污染物向下游(截流区)排放的主要控制点。(3)截流工程实施后,非点污染源将成为苏州河污染最主要的来源之一。 相似文献
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通过对诸暨市城区空气中总悬浮颗粒物(TSP)采用不同的自动连续采样时间获得的日平均浓度对比研究发现,每日采样的时间只有达到18小时以上,才能体现真实的日平均浓度。 相似文献
176.
Bioaugmentation of denitrifying bacteria can serve as a promising technique to improve nutrient removal during wastewater treatment. While denitrification inhibition by bacterial quorum sensing (QS) in Pseudomonas aeruginosa has been indicated, the application of bacterial QS disruption to improve nitrate removal from wastewater has not been investigated. In this study, the effect of bioaugmentation of P. aeruginosa SD-1 on nitrate removal in sequencing batch reactors that treat nitrate rich wastewater was assessed. Additionally, the potential of a quorum sensing inhibitor (QSI) to improve denitrification following bacterial bioaugmentation was evaluated. Curcumin, a natural plant extract, was used as a QSI. The chemical oxygen demand (COD) and initial nitrate concentration of the influent were 700±20 mg/L and 200±10 mg/L respectively, and their respective concentrations in the effluent were 56.9±3.2 mg/L and 9.0±3.2 mg/L. Thus, the results revealed that bioaugmentation of P. aeruginosa SD-1 resulted in an increased nitrate removal to 82%±1%. Further, nitrate was almost completely removed following the addition of the QSI, and activities of nitrate reductase and nitrite reductase increased by 88%±2% and 74%±2% respectively. The nitrogen mass balance indicated that aerobic denitrification was employed as the main pathway for nitrogen removal in the reactors. The results imply that bioaugmentation and modulation of QS in denitrifying bacteria, through the use of a QSI, can enhance nitrate removal during wastewater treatment. 相似文献
177.
Xiaoyou Zhang Xianli Ruan Minchan Yan Yaxian Zhao Wuji Wei Yongjian Yang Haiming Xu Yan Li 《环境科学学报(英文版)》2011,23(7):1199-1204
Polybrominated diphenyl ethers (PBDEs) as ubiquitous persistent organic pollutants have attracted much attention in recent years.
Exposure to PBDEs could induce a high health risk for children. The aim of this study was to investigate the PBDEs exposure of
children (9–12 years) from Taizhou, China. Fifty-eight blood samples were collected in one school in a mountainous area in Taizhou.
The concentrations of Σ9PBDEs (sum of BDE-28, -47, -99, -100, -153, -154, -183, -197 and -209) ranged from 2.66 to 33.9 ng/g lipid
wet (lw) with a median of 7.22 ng/g lw. These concentrations were lower than those of children in USA, but close to European and
Asian general population levels. The results showed that children in Taizhou countryside were at a low level of PBDEs exposure. The
predominant congener was BDE-209, followed by BDE-28, -47, -197 and -153. High abundance of BDE-209 was consistent with the
pollution background of PBDEs in China characterized by high brominated congeners as main pollutants. 相似文献
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