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1.
The migration pathways for polyaromatic hydrocarbons (PAH) and the associated active attenuating mechanisms within the urban environment are examined. The interest in developing an improved understanding of PAH migration/attenuation is focused toward quantification of the cost-effectiveness of urban runoff control strategies for mitigation of PAH inputs to receiving water bodies.A case study application to the City of Sault Ste Marie demonstrates that snow removal from sub-basins with the largest deposition rates, and relatively small wet and/or dry stormwater management ponds, are the most cost-effective remediation strategies. 相似文献
2.
Diazinon contamination of California's rivers has resulted in placing several rivers on the federal Clean Water Act § 303d list of impaired waterways. Impaired water body listing requiresthe development of Total Maximum Daily Loads (TMDL). Previous studies identified stormwater related diazinon pulses in California rivers. This study was conducted to monitor diazinonconcentrations in the Sacramento River watershed after rainfallevents, to ascertain whether pulses could be identified and, ifconcentrations of concern were observed, to estimate loadings anddetermine geographic origins of the insecticide. TMDL developmentrequires knowledge of contaminant sources, loadings, and geographic origins. Flow and diazinon concentrations peaked in the Sacramento River at Sacramento after the three largest stormsduring January and February 1994. Diazinon concentrations peakedconsequent to each of three storms. Diazinon concentrationsmeasured in the Sacramento River at Sacramento exceeded theCalifornia Department of Fish and Game acute and chroniccriteria for protection of aquatic life during January andFebruary for nine and nineteen days, respectively. Multipleexceedances were observed throughout the watershed. Diazinon loading and geographic origin differed with each of the three storms. The design of this study provides a useful template for others attempting to identify loadings and sources of contaminants in surface waters and to rectify aquatic ecosystemcontamination from various land use practices. 相似文献
3.
城市物流形成绿色化发展趋势的主要动因在于汽车运输业的迅速发展及其给城市环境与人们生活质量所造成的巨大影响上.二战以后,汽车运输业的迅速发展和在给社会提供迅速、便捷与准确服务的同时,也给城市的环境造成了严重的负面影响;尤其是由于城市路网和货物运输中心等基础设施既落后且缺乏科学的规划,无形中更加剧了城市物流与城市环境保护之间的矛盾.为实现城市物流的绿色化发展,实践中就有必要合理规划城市物流系统、通过多式联运以尽量降低卡车运输量的比例、积极应用信息技术以推进和实现物流管理的智能化、发展第三方物流实现共同配送. 相似文献
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本文从林场安全生产管理实际出发,论述了国有林场如何贯彻实施(安全生产法),提高林场安全生产依法管理水平的内容与措施。 相似文献
7.
对焦化厂蒸氨废水中的有机物进行了GC/MS分析,发现酚类,吲哚,喹啉和硫醇是主要污染物成分。对旨在降低蒸氨废水硫化物含量的各种处理方法进行了比较。采用CWZ-01吸附剂的吸附法能使废水中硫化物降至30mg/L以下。 相似文献
8.
D. E. Barb J. F. Cruise X. Mo 《Journal of the American Water Resources Association》1996,32(3):511-519
ABSTRACT: A model for urban stormwater quality was developed in this study. The basis for the model is the process by which pollutants build up on the watershed surface. For the wet climate of the study site, it was assumed that there exists an interval of time over which the pollutant buildup equals the pollutant washoff (no accumulation of pollutant). The buildup model was represented by a linear function of the antecedent dry time. The buildup function was then linked with a pollutant washoff model represented by a power function of the storm runoff volume. Various time intervals for no net accumulation were tested to calibrate the model. The model was calibrated to observed data for two small urban basins in Baton Rouge, Louisiana, and model results were used to analyze the behavior of phosphorus concentrations in storm runoff from these basins over a long period of time. 相似文献
9.
Joseph Domagalski 《Journal of the American Water Resources Association》1996,32(5):953-964
ABSTRACT: Pesticides in stormwater runoff, within the Sacramento River Basin, California, were assessed during a storm that occurred in January 1994. Two organophosphate insecticides (diazinon and methidathion), two carbamate pesticides (molinate and carbofuran), and one triazine herbicide (simazine) were detected. Organophosphate pesticide concentrations increased with the rising stage of the hydrographs; peak concentrations were measured near peak discharge. Diazinon oxon, a toxic degradation product of diazinon, made up approximately 1 to 3 percent of the diazinon load. The Feather River was the principal source of organophosphate pesticides to the Sacramento River during this storm. The concentrations of molinate and carbofuran, pesticides applied to rice fields during May and June, were relatively constant during and after the storm. Their presence in surface water was attributed to the flooding and subsequent drainage, as a management practice to degrade rice stubble prior to the next planting. A photo-degradation product of molinate, 4-keto molinate, was in all samples where molinate was detected and made up approximately 50 percent of the total molinate load. Simazine, a herbicide used in orchards and to control weeds along the roadways, was detected in the storm runoff, but it was not possible to differentiate the two sources of that pesticide to the Sacramento River. 相似文献
10.
北京山区小流域治理措施综述 总被引:1,自引:0,他引:1
山区小流域综合治理,是中国治理水土流失的主要形式.近10年来,随着可持续发展概念的引入,山区小流域治理与经济开发、资源保护相结合的战略思想逐渐被人们认识和接受,实现流域的可持续发展,已成为当今小流域治理活动的准则.综述主要对北京山区小流域治理措施进行了总结,并指出小流域治理需要综合运用多种措施;小流域治理必须充分考虑流域特征,因地制宜,分类治理. 相似文献