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排序方式: 共有163条查询结果,搜索用时 46 毫秒
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The Science of Nature - 相似文献
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The PCDD/F levels in the sewage sludge of a village in North-East Germany were substantially above the limit of 100 pg I-TEq/g for sludge applied to land. A study was initiated to identify the PCDD/F sources in the sewage of this treatment plant. It was found that the PCDD/F contamination entered the plant through the faecal inlet, where the content of faecal storage tanks was emptied into the treatment plant. The isomeric patterns of the higher chlorinated homologues were similar to that of PCP, while incineration showed some influence on the lower chlorinated homologues. Cluster analysis revealed a profile similar to that of PCP. 相似文献
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Der Beitrag umfa?t eine übersicht über die Entwicklung wesentlicher Segmente des in Deutschland und international zug?nglichen
Angebots an Umweltdatenbanken. Anschlie?end werden wichtige Umweltdatenbanken im Angebot von STN International dargestellt.
Anhand ausgew?hlter Beispiele aus der Recherchepraxis werden schlie?lich Ablauf (Stufen der Vorbereitung, Durchführung und
Nachbereitung) sowie Ergebnisse der Online-Recherche in wichtigen STN-Umweltdatenbanken dargestellt. 相似文献
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Toward a high-rate enhanced biological phosphorus removal process in a membrane-assisted bioreactor.
Alessandro Monti Eric R Hall Fred A Koch Robert N Dawson Hadi Husain Harlan G Kelly 《Water environment research》2007,79(6):675-686
A membrane enhanced biological phosphorus removal (MEBPR) process was studied to determine the impact of hydraulic retention time (HRT) and solids retention time (SRT) on the removal of chemical oxygen demand (COD), nitrogen, and phosphorus from municipal wastewater. The MEBPR process was capable of delivering complete nitrification independent of the prevailing operating conditions, whereas a significant improvement in COD removal efficiency was observed at longer SRTs. In the absence of carbon-limiting conditions, the MEBPR process was able to achieve low phosphorus concentrations in the effluent at increasingly higher hydraulic loads, with the lowest HRT being 5 hours. The MEBPR process was also able to maintain optimal phosphorus removal when the SRT was increased from 12 to 20 days. However, at higher suspended solids concentrations, a substantial increase was observed in carbon utilization per unit mass of phosphorus removed from the influent. These results offer critical insights to the application of membrane technology for biological nutrient removal systems. 相似文献
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Verdonck FA Boeije G Vandenberghe V Comber M de Wolf W Feijtel T Holt M Koch V Lecloux A Siebel-Sauer A Vanrolleghem PA 《Chemosphere》2005,58(9):1169-1176
Within the context and scope of the forthcoming European Union chemical regulations (REACH), there is a need to be able to prioritise the chemicals for evaluation. Therefore, a simple, pragmatic and adequately conservative approach for the identification of substances of very low or no immediate concern at an early stage is presented. The fundamental principles and basic concepts are derived from the EU Technical Guidance Document and EUSES, and are translated into an easy-to-use rule-based system. For this development, the effect on risk characterisation ratios (RCRs) of the key environmental parameters in EUSES was quantified (taking into account several standardised chemical release scenarios). Using statistical analysis, ranges were identified for each key parameter, within which the end result of the assessment was not significantly affected. This information was then translated into a lookup table from which environmental risk characterisation ratios can be directly read as a function of a few parameters. 相似文献
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Attias L Boccardi P Boeije G Brooke D de Bruijn J Comber M Dolan B Fischer S Heinemeyer G Koch V Lijzen J Müller B Murray-Smith R Rikken M Tadeo J Vermeire T 《Chemosphere》2005,59(4):473-485
This publication presents major changes in the assessment of the risks of chemicals to human health and the environment as implemented in the second version of the European Union System for the Evaluation of Substances, EUSES 2.0. EUSES is a harmonised quantitative risk assessment tool for chemicals. It is the PC-implementation of the technical guidelines developed within the framework of EU chemical legislation for industrial chemicals and biocides. As such, it is designed to support decision making by risk managers in government and industry and to assist scientific institutions in the risk assessment for these substances. The development of EUSES 2.0 is a co-ordinated project of the European Chemicals Bureau, EU Member States and the European chemical industry. Several model concepts, the technical background and the user interface of EUSES have been improved considerably. Major changes in the environmental assessment such as the implementation of emission scenario documents for industrial chemicals and biocides, the addition of the marine risk assessment, the enhancement of the regional model to include global scales, and improvements in the secondary poisoning and environmental effects modelling will be discussed. The update of the human risk assessment module in EUSES focuses on the risk characterisation for both threshold and non-threshold substances with, among others, the introduction of assessment factors. The performance of EUSES is illustrated in an example showing the human and environmental risk assessment of a sanitation disinfectant for private use. 相似文献