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831.
火电厂烟气在线监测系统存在的主要问题及进一步加强在线监测工作的建议 总被引:1,自引:0,他引:1
火电厂燃煤过程排放的污染物是我国大气污染的主要来源之一,烟气排放连续监测系统(CEMS)是实现烟气排放连续监测有效的现代化仪器设备。介绍了目前我国火电厂烟气的CEMS主要存在的问题,并针对这些存在的问题提出了相应的解决方案。 相似文献
832.
Heidemarie Schaar Manfred Clara Norbert Kreuzinger 《Environmental pollution (Barking, Essex : 1987)》2010,158(5):1399-1404
The design criteria for wastewater treatment plants (WWTP) and the sludge retention time, respectively, have a significant impact on micropollutant removal. The upgrade of an Austrian municipal WWTP to nitrogen removal (best available technology, BAT) resulted in increased elimination of most of the analyzed micropollutants. Substances, such as bisphenol-A, 17α-ethinylestradiol and the antibiotics erythromycin and roxithromycin were only removed after the upgrade of the WWTP. Nevertheless, the BAT was not sufficient to completely eliminate these compounds. Thus, a pilot scale ozonation plant was installed for additional treatment of the effluent. The application of 0.6 g O3 g DOC−1 increased the removal of most of the micropollutants, especially for compounds that were not degraded in the previous biological process, as for example carbamazepine and diclofenac. These results indicated that the ozonation of WWTP effluent is a promising technology to further decrease emissions of micropollutants from the treatment process. 相似文献
833.
Fernandes HM Gomiero LA Peres V Franklin MR Simões Filho FF 《Journal of environmental management》2008,88(4):914-925
This paper discusses the environmental waste management of the Heap-Leach Uranium Production Facility of Caetité located in a semi-arid region in Brazil. A comparison is made with the first uranium production site of the country located in Poços de Caldas. It is demonstrated that differences in the operational process along with different environmental conditions can lead to different impacts. In the present case groundwater is the potential most sensitive environmental medium despite the well-established consensus in the literature that radon and aerosol emissions may turn-out to be the most relevant environmental aspects of an installation located at this type of region. Most of the 226Ra content in the ore remains in the leached ore that is deposited with the waste rock. A lack in appropriate prediction of the hydrological balance has been causing unanticipated emissions of liquid effluents into the environment. Chemical treatment of this effluent may be needed. Contamination of groundwater in the short term by the waste ponds is not to be expected but it can be a relevant issue in the long term. As a consequence, careful closure schemes will need to be put in place. Finally, the overall costs with remediation in the Caetité production center are lower than those observed at the Poços de Caldas mining site. 相似文献
834.
In this paper, we investigate the Precautionary Principle (PP) in action. Precaution is a fairly new concept in environmental
policy. It emerged back in the 1960s but did not consolidate until the 1980s, as it formed part of the major changes taking
place in environmental policies at that time. The PP is examined in three contexts. Firstly, we look at the meaning of the
concept and how it is disseminated through the media and public discourses to the political arenas of Denmark. Then we examine
how the idea is adopted to the political level. Thirdly, we look briefly at the first Danish translation of the principle
into a practical context, which includes translations into concrete scientific practices. It is concluded that if the PP shall
be more than a simple “idea” or a frequently used “term,” emphasis must be put on the transformation of the concept into concrete
practices, like e.g., the alternative testing regimes that we show in the case of plant growth-retarding pesticides presented
in this paper. 相似文献
835.
The paper puts focus on the selection of an appropriate framework for benchmarking studies of power cycles with CO2 capture. The need for a reference power plant without CO2 capture in a benchmarking study is emphasized. The impact of the use of site-specific plant boundary conditions is discussed as well as the selection of computational assumptions to reflect future technology development. A significant part of the paper is dedicated to a study of how changes in the benchmarking framework to reflect technology development can give additional knowledge about the potential for different CO2 capture technologies. A major conclusion, based on the findings, is that it should be highly relevant for technology providers to investigate the future development potential for a CO2 capture technology before launching a product development program. 相似文献
836.
Sammut ML Rose J Masion A Fiani E Depoux M Ziebel A Hazemann JL Proux O Borschneck D Noack Y 《Chemosphere》2008,70(11):1945-1951
There is a growing concern regarding the environmental and public health risks associated with airborne particulate matter (PM). The basic oxygen furnace is one of the most important atmospheric dust sources of the steel manufacturing process. It emits dust enriched in heavy metal such as Zn, which is assumed to contribute to the toxic potential of atmospheric PM. Dust collected before and after the filtration system was analyzed to determine Zn speciation. To this end, a variety of analytical tools were used and a sequential extraction protocol has been specifically developed for iron and steel dust. The Zn speciation results obtained by EXAFS and sequential extraction were in excellent agreement. Before filtration, the speciation of Zn in BOF was 43% ZnFe2O4, 23% ZnCO3 and 16% ZnO. The same species were detected after filtration with different proportions. BOF dust after filtration contains more soluble Zn phases which may play a role in the toxic effects of the emissions. 相似文献
837.
Arsenic contamination of soils and agricultural plants through irrigation water in Nepal 总被引:1,自引:0,他引:1
Dahal BM Fuerhacker M Mentler A Karki KB Shrestha RR Blum WE 《Environmental pollution (Barking, Essex : 1987)》2008,155(1):157-163
This study monitored the influence of arsenic-contaminated irrigation water on alkaline soils and arsenic uptake in agricultural plants at field level. The arsenic concentrations in irrigation water ranges from <0.005 to 1.014 mg L(-1) where the arsenic concentrations in the soils were measured from 6.1 to 16.7 mg As kg(-1). The arsenic content in different parts of plants are found in the order of roots>shoots>leaves>edible parts. The mean arsenic content of edible plant material (dry weight) were found in the order of onion leaves (0.55 mg As kg(-1))>onion bulb (0.45 mg As kg(-1))>cauliflower (0.33 mg As kg(-1))>rice (0.18 mg As kg(-1))>brinjal (0.09 mg As kg(-1))>potato (<0.01 mg As kg(-1)). 相似文献
838.
839.
火电厂对生态环境影响的总体评价 总被引:1,自引:1,他引:0
抛弃了以往在分析污染排放物对环境影响时只对不同污染物进行单独分析的做法,从单位污染物对大气的影响和生产单位有用能的污染物排放量两方面考虑,建立了一个通用的、能综合评价各种污染物对环境总体影响的模型--能源生态效率模型,并对燃烧不同燃料火电厂的能源生态效率作了计算,对能源生态效率的影响因素进行了分析. 相似文献
840.
说明了污水处理厂自动控制系统的类型、特点与应用研究现状,介绍了自控系统在国内外污水处理厂的应用研究现状,分析了污水处理厂自控系统广泛应用的限制因素,并指出了今后污水处理厂自控系统的发展趋势。 相似文献