共查询到20条相似文献,搜索用时 109 毫秒
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利用气浮-水解酸化-反应沉淀-接触氧化工艺对石化废水进行处理。运行结果表明:该工艺能够有效去除石化废水的COD、石油类、甲苯、二甲苯和苯酚,出水各项指标均达到GB 8978-1996《国家污水综合排放标准》二级标准的要求。 相似文献
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混凝气浮-微电解-SBR工艺处理油墨与黏合剂混合废水 总被引:6,自引:0,他引:6
介绍了采用混凝气浮 -微电解 -SBR工艺处理纸箱包装行业油墨和黏合剂混合废水的工程实例 ,经该工艺处理后的废水达到国家一级排放标准。该工艺具有占地少、效果好、运行稳定可靠等特点 相似文献
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利用厌氧和好氧浮动生化床相结合的工艺处理以乳制品废水为主的中高浓度有机废水,处理后水质达到《污水综合排放标准》(GB8978-1996)一级标准,实践表明该工艺具有占地面积小、工程投资低、运行效果稳定等优点。 相似文献
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对不锈钢管业生产过程产生的废水采用中和、絮凝方法进行处理。出水可以达到国家污水综合排放标准(GB8978—1996)新建一级标准。利用该工艺处理废水的特点是工艺简单、投资省、占地小、操作简单、运行稳定、处理效果好。 相似文献
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采用物化法与生化法相结合的工艺处理含油废水,工程运行实践表明,该工艺处理效果好、运行稳定,各项指标均可达到GB8978-1996<污水综合排放标准>中的一级排放标准. 相似文献
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介绍采用气浮-水解-接触氧化工艺处理蜡防印花废水技术。工程实践运行表明,该工艺处理效果好、运行稳定。各项指标均可达到《纺织染整工业水污染物排放标准》(GB4287-1992)二级排放标准。 相似文献
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美国依据《清洁水法》建立了一套较完善的水环境质量基准体系,并开展了水生生物基准、人体健康基准、营养物基准、沉积物质量基准、细菌基准、生物学基准、野生生物基准和物理基准等方面的研究. 在重点分析美国水环境质量基准体系、基准制定方法和研究进展的基础上,提出了我国开展水环境质量基准研究的建议,即提高对我国开展水环境质量基准研究的迫切性和重要性的认识,并根据我国的实际情况,建立一套适合我国国情的水环境基准体系和基准制订工作指南,同时做好国外水环境质量基准的采用与验证工作. 相似文献
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以硝基苯为研究对象,在分析美国和中国2种类型水生态系统和生物区系特征的基础上,分别筛选两国水生生物物种的毒性数据,运用物种敏感度分布曲线法、毒性百分数排序法和评价因子法分别推导了2个国家保护淡水水生生物水质基准;同时,结合国内外主要水体ρ(硝基苯)分布特征,对地表水体中硝基苯生态风险进行了初步评价.结果表明:由于生物区系不同,同样方法得到的美国水质基准值明显高于中国水质基准值,其中物种敏感度分布曲线法得出的基准值最为合理.用物种敏感度分布曲线法得到中国硝基苯急性基准值为0.572mg/L,慢性基准值为0.114mg/L;美国硝基苯急性基准值为7.271mg/L,慢性基准值为2.031mg/L.风险表征结果显示,中国主要地表水体中硝基苯不存在潜在的生态风险. 相似文献
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建设项目环境影响经济评价方法研究 总被引:6,自引:0,他引:6
对建设项目进行环境影响经济评价的类型划分基础上,提出了环境影响经济评价指标体系,环境影响评价的“有无对比法”和“增量评价法”以及实例,并就评价方法运用的进一步研究,如评价参数的选取、评价结果的处理等提出了建议。 相似文献
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采用物化生化联合工艺进行了城市污水处理的生产性试验 ,试验结果表明 :联合工艺同时具有物化法和生化法的优点 ,用它来处理城市污水时 ,处理效率高 ,时间短 ,运行费用低 ,COD、BOD5、SS、NH3-N、T -P的平均去除率分别为 70 .4 %、83 .2 %、87.1 %、58.6 %、92 .3 % ,污水的总停留时间约 3h,处理每吨污水的运行费用为 0 .33元。污水经处理后出水指标达到国家GB8979- 1 996及广州GD4437- 90城市污水排放一级标准 相似文献
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Several eco-labels for wild-caught seafood have been developed during the last decade. This article describes and analyses the criteria applied by four different eco-labelling schemes for seafood products from capture fisheries, and discusses the criteria in terms of environmental impacts, based on the ISO 14040 standard for life cycle assessment.It is concluded that the most widespread eco-label, the Marine Stewardship Council (MSC), mainly addresses the fishing stage, in particular the overexploitation of marine resources. LCA studies confirm that the fishing stage represents the most significant environmental burden, but energy consumption and emissions of anti-fouling agents at the fishing or harvesting stage contribute with significant impacts that are not being addressed by international labelling initiatives for wild-caught seafood.LCA studies show that significant environmental impacts are related to the life cycle stages after landing. This includes fish processing, transport, cooling and packaging (especially for highly processed seafood products). Hence, another challenge would be to include criteria related to the post-landing consumption of energy, certain materials and chemicals, waste handling and wastewater emissions. Minimizing product losses throughout the product chain would also be an important area for future criteria in order to avoid fishing at high environmental costs only to produce something that is later wasted.The analysis shows that the Swedish KRAV is the only one that currently addresses a range of issues that include energy and chemicals in the whole life cycle of the products. International initiatives such as MSC cover fish products from many parts of the world emphasizing ‘overexploitation of fish resources’. It is recommended, however, that international initiatives such as MSC develop criteria related to energy use and chemicals – at least at the fishing stage. Over time, other life cycle stages could be addressed as well to the extent that this is manageable. 相似文献
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Leah Mason Timothy Prior Gavin Mudd Damien Giurco 《Journal of Cleaner Production》2011,19(9-10):958-966
The concept of ‘peaks’ in the production of natural resources has attracted attention in the area of energy production, with concerns about ‘peak oil’ driving recent research and investment in alternative sources of energy. There are fundamental and important differences between a peak in the production of oil and peaks in the production of metalliferous minerals, but in both cases production changes from ‘easier and less expensive’ early in a resource’s life to ‘difficult and expensive’ as time progresses. The impacts of this change in production circumstances require critical consideration in the governance of national and sub-national mineral endowments.This paper develops a framework for evaluating the impacts of changing patterns of mineral production. The framework considers three criteria: availability of a resource (considering its geological characteristics and geographical distribution); society’s addiction to the resource (its centrality and criticality to economic, social and environmental systems); and the possibility of finding alternatives (whether the resource can be substituted or recovered). An initial assessment against these criteria provides an overview of how a production peak might affect the production of minerals in Australia and the impacts that this might have on the Australian economy.Assessing important resources against these three criteria will be imperative in future considerations regarding the roles minerals and metals play as service providers in our economic, social and environmental systems. Additionally, this analysis should prompt a reassessment of the value of minerals beyond economic measures. Indicators derived from these criteria will inform strategies that can address future changes in production characteristics – meeting challenges with strong governance, and realising opportunities with proactive policy. 相似文献