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排序方式: 共有770条查询结果,搜索用时 15 毫秒
191.
提出场地土壤污染控制应从源头抓起,应控制搬迁企业移交土地后先拆迁平整,后进行土地利用性质变更的做法.在场地污染土壤调查中应重视对原址企业的历史沿革、平面布局、生产工艺等调查.指出多环境要素调查的重要性,以及调查过程要注意的事项.对土壤评估标准及引用的选择进行了探讨. 相似文献
192.
概述了建设项目竣工环境保护验收监测点位的布设、监测因子的选择及监测频次的确定。 相似文献
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195.
为对智慧工地全生命周期的本质安全度进行分析与评价,综合运用本质安全理论,构建智慧工地本质安全度评价模型.首先,根据智慧工地本质安全定义,将智慧工地本质安全度划分为初始级、简单级、标准级、成熟级和卓越级5个等级;其次,基于智慧工地的生产现状,构建包括人员管理系统、机械设备管理系统、现场监测预警系统、过程控制管理系统等4个... 相似文献
196.
为合理选择应急物流配送中心地址,提高应急管理能力,基于地震灾害风险评价数据,通过ArcGIS平台形成Voronoi图,可视化表达地震应急准备分区方案并进行应急物流中心预选址;在考虑需求权重情况下,构建应急物流配送中心优化选址模型,通过LINGO软件编程求解得出基于震灾应急准备分区的应急物流配送中心选址方案,并以A市为例,通过与传统行政区划建设方案进行对比,验证本文选址方案的有效性。研究结果表明:本文选址优化模型综合考虑各方面因素,使服务里程总量减少31.39%,单位服务量提高30.61%,验证选址方案的配送效率与公平性。 相似文献
197.
To investigate the environmental safety of waste disposal landfill sites and of land reclaimed from such sites, we evaluated
the toxicity of leachate from these sites by a combination of bioassays in the Japanese killifish medaka Oryzias latipes. We tested for lethal toxicity in adult and larval medaka and for hatching inhibition of embryos from eggs. As biochemical
evidence of the effects of leachate exposure, CYP1A (EROD activity) and vitellogenin (Vtg) were induced. We also bioassayed
water-treated leachate and downstream river water. Leachate solution was lethal to larval and adult medaka. Embryo hatchability
was inhibited, and abnormal hatching, spinal deformity and anisophthalmia occurred in embryos exposed to leachate solution.
CYP1A was induced by exposure to leachate solution diluted to 1.0%, and EROD activity was significantly higher than in control.
Vtg and unknown proteins were induced in the sera of male medaka exposed to the diluted leachate solution. Conventional water
treatments worked effectively to remove toxic compounds but did not work well to remove element ions, including heavy metals.
Treated leachate produced neither lethal toxicity nor hatching abnormalities during the exposure period. Fish toxicity tests
for leachate would be useful for monitoring the environmental safety of landfill sites. 相似文献
198.
An assessment of tree health and trace element accumulation near a coal-fired generating station, Manitoba, Canada 总被引:2,自引:0,他引:2
A forest health assessment was performed in stands dominated by bur oak and trembling aspen to study the potential effects of airborne emissions from a 132 MW coal-fired station. Forty-two stands were sampled within a 16-km radius of the station for both foliar stress symptoms and trace element toxicology. The concentrations of tracer elements (As, Ba, Sr, and V) in the leaf litter were not spatially congruent with airborne emission deposition models (except Ba, which showed elevated levels immediately SE of the station), nor were they at phytotoxic levels. Elemental concentrations were significantly related to soil parameters including organic matter and texture. No patterns were found in forest health along directional or distance gradients from the generating station. Trembling aspen stands demonstrated little decline in general, but three of the 19 bur oak plots, all located on thin sandy soils developed on calcareous till, demonstrated branch dieback. In addition to poor soil conditions, two of these sites also had high water tables, and exhibited tree mortality. The bur oak decline did not appear to be related to emissions from the station, but is suspected to be a result of poor site quality, with urban development as a confounding factor. 相似文献
199.
Integration of traditional and innovative characterization techniques for flux-based assessment of Dense Non-aqueous Phase Liquid (DNAPL) sites 总被引:1,自引:0,他引:1
Nandita B. Basu P. Suresh C. Rao Irene C. Poyer Subhas Nandy Megharaj Mallavarapu Ravi Naidu Greg B. Davis Bradley M. Patterson Michael D. Annable Kirk Hatfield 《Journal of contaminant hydrology》2009,105(3-4):161-172
Key attributes of the source zone and the expanding dissolved plume at a trichloroethene (TCE) site in Australia were evaluated using trends in groundwater monitoring data along with data from on-line volatile organic compound (VOC) samplers and passive flux meters (PFMs) deployed in selected wells. These data indicate that: (1) residual TCE source mass in the saturated zone, estimated using two innovative techniques, is small ( 10 kg), which is also reflected in small source mass discharge ( 3 g/day); (2) the plume is disconnecting, based on TCE concentration contours and TCE fluxes in wells along a longitudinal transect; (3) there is minimal biodegradation, based on TCE mass discharge of 6 g/day at a plume control plane 175 m from source, which is also consistent with aerobic geochemical conditions observed in the plume; and (4) residual TCE in the vadose zone provides episodic inputs of TCE mass to the plume during infiltration/recharge events. TCE flux data also suggest that the small residual TCE source mass is present in the low-permeability zones, thus making source treatment difficult. Our analysis, based on a synthesis of the archived data and new data, suggests that source treatment is unwarranted, and that containment of the large TCE plume ( 1.2 km long, 0.3 km wide; 17 m deep; 2000–2500 kg TCE mass) or institutional controls, along with a long-term flux monitoring program, might be necessary. The flux-based site management approach outlined in this paper provides a novel way of looking beyond the complexities of groundwater contamination in heterogeneous domains, to make intelligent and informed site decisions based on strategic measurement of the appropriate metrics. 相似文献
200.