共查询到20条相似文献,搜索用时 93 毫秒
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本文就用水和排水的有关统计指标如循环用水和重复用水,循环用水率和重复用水率,废水率和外排废水处理率等进行了探讨,并提出了新水补充率,废水排放率等几个建议增补的统计指标,同时对各指标间的内在平衡关系进行了简要说明。 相似文献
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前言火力发电厂是用水大户之一。其主要用水点是汽机的冷凝器,用水量与机组容量、供水方式、冷却倍率等因素有关。当采用直流供水系统时,加上各种辅助设备的冷却水、锅炉补充水、生活消防水和除灰用水 相似文献
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海水淡化技术在沿海电厂的应用前景 总被引:2,自引:1,他引:1
介绍了目前常用的几种海水淡化方法的工艺原理及其适用范围,并从可持续发展的角度阐明了沿海电厂生产用水采用淡化海水的可行性和必要性,为沿海新建电厂用水规划提供参考。 相似文献
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国内外研究表明,除了水质,生态用水也是维持生态系统健康发展的重要因素。因此,在水资源配置中保证一定量的生态用水是保护生态环境的重要措施。生态用水具有时空尺度和阈值范围,而人类大规模的水电开发则会造成其时空尺度的改变,甚至生态阈限难以被满足。统计数字表明,近5年来我国新建水电站下泄生态流量的不满足率达到57%。我国目前急需考虑的生态用水政策是:尽快建立河流最小生态流量的相关标准,制定河流生态用水配套法律法规;同时,通过跨流域调水等水段,加强生态环境需水的宏观调控。建议最小生态用水量不应小于工程所在河流控制断面多年平均流量的10%,当多年平均流量大于80m^3/s时不小于5%;同时根据河流的不同生态环境功能,应积极开展多方法、多方案比选。 相似文献
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提出一种居民家庭自动蓄水循环系统和二次循环水利用及新型概念房的构想。通过错过夏天用水高峰时段,合理利用夜晚水压进行水箱日常用水的自动补给。中水回用和雨水收集使得在概念房的有限面积内达到最大的水循环利用效率。 相似文献
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石油化工企业的节水减排 总被引:4,自引:2,他引:2
概述了石油化工行业的用水及节水减排现状,分析了目前条件下节水减排工作存在的主要问题,提出了采用清洁生产技术、节水技术、优化用水排水系统、废水资源化等节水减排的具体措施。 相似文献
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结合天津第一热电厂给水处理技改工程,对利用河水处理后用于锅炉补给水除盐工艺中混床的原理和操作运行作了具体分析,对混床设计中需注意的事项进行了探讨,为电厂除盐水处理设计运行提供参考. 相似文献
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以河南省某制革企业综合有机废水处理工程为实例,根据排放废水的水质水量及处理要求进行工程分析,对含铬废水的处理提出工艺流程;对综合有机废水处理工艺各构筑物的功能和设计进行了详细阐述. 相似文献
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徐州电厂超超临界1000MW机组投产后及时采用了给水加氧处理技术,介绍了1号机组给水加氧转换过程、水汽指标的变化情况。加氧处理技术实施后水汽系统含铁量显著降低,精处理混床运行周期延长,加药量减少,效果显著,提高了机组运行的经济性和安全性。 相似文献
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Wahyudiono Mitsuru Sasaki Motonobu Goto 《Journal of Material Cycles and Waste Management》2011,13(1):68-79
The conversion of biomass waste into resources as a recycling process is receiving increased interest due to the perceived
need for a sustainable global carbon cycle and environmental considerations. Several treatment processes are being developed.
Hydrothermal treatment is one of the most effective approaches, because water at high temperatures and high pressures behaves
as a reaction medium with remarkable properties. In this work, the reaction behavior of guaiacol as a biomass model compound
was studied in subcritical water at 483–563 K and in supercritical water at 653–673 K using a batch reactor. Guaiacol can
be considered representative of the aromatic ring structures present in lignin, a major component of woody biomass. The chemical
species formed in aqueous products were identified by gas chromatography/mass spectrometry and quantified using high-performance
liquid chromatography. The effect of pressure and reaction time on the conversion process of guaiacol is discussed. The results
obtained indicate that this method has potential for efficient organic waste conversion. 相似文献
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The second and third steps of wastewater treatment in the tanning industry generate sludges that are rich in salts, organic matter and suspended solids. Since these are formally catalogued as industrial wastes by environmental legislation, they cannot be disposed of directly but need a final treatment. One of the problems with these wastes is their high water content, which has to be reduced. In the particular case of the concentrated streams from the secondary and tertiary treatment steps, the sludges are first concentrated by evaporation, and the evaporated water is used in other parts of the plant. This study, which preceded evaporator design, analysed the evaporation process (laboratory scale) of a saline residue produced in the reverse osmosis step of the treatment of tanning wastewaters by the company Aquagest Levante, S.A. in Lorca (Murcia, Spain), to ascertain its behaviour in the evaporation process and the evolution of its physical properties. The study served to determine the exact mineralogy and ionic composition as well as the characteristics of the waste in question. This information was used in the last step of the design of the evaporation equipment. 相似文献