共查询到19条相似文献,搜索用时 250 毫秒
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松花江四方台段是哈尔滨市生活饮用水水源地取水段,属环境敏感区和重点保护水域。聚合物工程的建设对其水质影响如何?是人们十分关心的问题。本文依据拟建工程的排水特点及受纳水体的水文特征,分别采用非持久性污染物完全混合衰减模式、推流递减模式、完全稀释混合模式和紊流扩散模式,对大明泡、库里泡、西排干和松花江四方台江段进行了水质连续性预测,预测项目为COD_(Mn)、BOD_5和石油类,预测结果可供有关部门决策时参考。 相似文献
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为了解新疆湖、库的水质现状,采用水质综合评价模式对新疆主要湖、库水质现状给出了适应《地面水环境质量标准》GB3838-88为标准的水质综合特征模式。该模式给出的信息量大,表达直观,不仅能给出各水质参数的水域类别,划分水域类别的依据参数,还能给出超V类水域的水质参数的超标倍数。在现状评价基础上,利用灰色系统理论对污染湖、库的主要污染参数进行了预测分析。 相似文献
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本文讨论了氧化塘的净化污水机理和水质变化特点。提出了用于进行氧化塘水质预测的二维水质模型。探讨了氧化塘水质预测研究的发展趋势。 相似文献
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河道治理工程重在改善河道的水质,以恢复河流生态系统。本文以北京市大兴区天堂河河道治理工程为例,介绍了河道治理工程环境影响评价中的水质改善预测分析,首先分析生态需水量和供氧量是否满足河流生态需水要求,后又利用地面水环评助手软件预测了河流水质,预测分析了天堂河水质目标的可达性,旨在为以后的河道治理类工程环境影响评价提供参考。 相似文献
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利用二维模型求解太湖水质CODMn的研究 总被引:1,自引:0,他引:1
在二维黎曼近似解模型的基础上建立了太湖水质预测模型,并运用该模型对太湖的水质指标CODMn了模拟。模拟的结果跟太湖各监测站的测量值相接近,表明该模型能较好的运用于太湖的水质预测。 相似文献
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本文根据西岭雪山风景区的生态、环境特征和水质标准,选择了8个评价指标,对8个采样带和全游览景区的水体质量,运用模糊数学方法进行了综合评价研究 相似文献
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水危机与中水回用技术方法的探讨 总被引:3,自引:0,他引:3
张雪 《中国环境管理干部学院学报》2009,19(2):95-98
世界与国内水资源短缺的现状表明中水回用十分迫切。本文介绍了国内外中水回用的应用情况,表明该技术对缓解世界与国内的用水压力起着举足轻重的作用。阐述了中水回用的技术方法、水质要求及工艺流程,讨论了中水回用的实际意义,结论表明:中水回用提高了水的利用率,实现了水资源的可持续发展。 相似文献
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Jud Harvey Jesus Gomez‐Velez Noah Schmadel Durelle Scott Elizabeth Boyer Richard Alexander Ken Eng Heather Golden Albert Kettner Chris Konrad Richard Moore Jim Pizzuto Greg Schwarz Chris Soulsby Jay Choi 《Journal of the American Water Resources Association》2019,55(2):369-381
Downstream flow in rivers is repeatedly delayed by hydrologic exchange with off‐channel storage zones where biogeochemical processing occurs. We present a dimensionless metric that quantifies river connectivity as the balance between downstream flow and the exchange of water with the bed, banks, and floodplains. The degree of connectivity directly influences downstream water quality — too little connectivity limits the amount of river water exchanged and leads to biogeochemically inactive water storage, while too much connectivity limits the contact time with sediments for reactions to proceed. Using a metric of reaction significance based on river connectivity, we provide evidence that intermediate levels of connectivity, rather than the highest or lowest levels, are the most efficient in removing nitrogen from Northeastern United States’ rivers. Intermediate connectivity balances the frequency, residence time, and contact volume with reactive sediments, which can maximize the reactive processing of dissolved contaminants and the protection of downstream water quality. Our simulations suggest denitrification dominantly occurs in riverbed hyporheic zones of streams and small rivers, whereas vertical turbulent mixing in contact with sediments dominates in mid‐size to large rivers. The metrics of connectivity and reaction significance presented here can facilitate scientifically based prioritizations of river management strategies to protect the values and functions of river corridors. 相似文献
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利用生物预处理工艺提高城市供水水质,大力发展城市分质供水,实现城市直饮水,是我国新世纪城市化进程及环保产业发展的趋势。本文论述了生物预处理的意义、工艺、效果、影响及其在城市供水中的意义。介绍了分质供水在国内外的发展,探讨了生物预处理与分质供水在城市中的应用及发展前景。 相似文献
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This paper presents key challenges in modeling water quality processes of riparian ecosystems: How can the spatial and temporal extent of water and solute mixing in the riparian zone be modeled? What level of model complexity is justified? How can processes at the riparian scale be quantified? How can the impact of riparian ecosystems be determined at the watershed scale? Flexible models need to be introduced that can simulate varying levels of hillslope‐riparian mixing dictated by topography, upland and riparian depths, and moisture conditions. Model simulations need to account for storm event peak flow conditions when upland solute loadings may either bypass or overwhelm the riparian zone. Model complexity should be dictated by the level of detail in measured data. Model algorithms need to be developed using new macro‐scale and meso‐scale experiments that capture process dynamics at the hillslope or landscape scales. Monte Carlo simulations should be an integral part of model simulations and rigorous tests that go beyond simple time series, and point‐output comparisons need to be introduced. The impact of riparian zones on watershed‐scale water quality can be assessed by performing simulations for representative hillsloperiparian scenarios. 相似文献
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Peter J. Tango Richard A. Batiuk 《Journal of the American Water Resources Association》2013,49(5):1007-1024
Achieving and maintaining the water quality conditions necessary to protect the aquatic living resources of the Chesapeake Bay and its tidal tributaries has required a foundation of quantifiable water quality criteria. Quantitative criteria serve as a critical basis for assessing the attainment of designated uses and measuring progress toward meeting water quality goals of the Chesapeake Bay Program partnership. In 1987, the Chesapeake Bay Program partnership committed to defining the water quality conditions necessary to protect aquatic living resources. Under section 303(c) of the Clean Water Act, States and authorized tribes have the primary responsibility for adopting water quality standards into law or regulation. The Chesapeake Bay Program partnership worked with U.S. Environmental Protection Agency to develop and publish a guidance framework of ambient water quality criteria with designated uses and assessment procedures for dissolved oxygen, water clarity, and chlorophyll a for Chesapeake Bay and its tidal tributaries in 2003. This article reviews the derivation of the water quality criteria, criteria assessment protocols, designated use boundaries, and their refinements published in six addendum documents since 2003 and successfully adopted into each jurisdiction's water quality standards used in developing the Chesapeake Bay Total Maximum Daily Load. 相似文献
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介绍碳黑废水处理工艺流程的技术改造及其技术要点。着重阐述了关键设备斜管沉淀池的运行原理、运行结果及其在整个流程改造过程中所起的作用。改造后的工艺流程特点是斜管沉淀效率高,出水水质好,副产品碳黑质优销路好,劳动强度低,废水可循环使用,设备占地少,运行费用低,总体效益好。改造后实现了全厂生产用水闭路循环,取得了可观的经济、环境、社会效益。废水循环利用在技术上是可行的,经济上有收益,实现了废水及固体废物的资源化。 相似文献
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不同加药量的采出水絮凝试验表明:硅藻土是一种能够用于采出水处理工艺的新型药剂,絮凝沉降后水的浊度可降低到1NTU左右,悬浮物的体积浓度降低到0.0005%以下,颗粒物的分布特征值向有利于通过过滤工艺去除的大尺度方向变化。适当的加药量为50mg/L。 相似文献
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介绍国外公司新开发的多种新型采出水处理设备的结构、性能和特点。这些新型的水处理设备投入生产后,使采出水水质得到提高并达到水质标准,其中有的设备已在国内油田引进,用于采出水处理,已经取得良好效果。 相似文献