Results 91 to 100 of about 78,097 (269)
Jingshui jishu【目的】北方某大型水库监测到位于该水库的引水隧洞水体中锰(Mn)浓度出现季节性升高现象。【方法】为防止管网发生Mn致“黄水”,基于前期研发的粉末活性炭(PAC)催化氯(Cl 2 )氧化去除Mn(Ⅱ)方法，以Mn(Ⅱ)质量浓度低于20μg/L为去除目标，本文利用水库原水进行不同条件下的应急氧化除Mn(Ⅱ)试验。【结果】在Mn(Ⅱ)初始质量浓度为400μg/L时，单独使用2 mg/L Cl 2 或10 mg/L煤基PAC在120 min内对Mn(Ⅱ)的去除率仅有2%左右 ...
Yin Shuangxing +6 more
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The state of sewage system economics in rural areas in Poland [PDF]
, 2009 Infrastructure is the basis of economic activities both in urban and in rural areas. It is also one of main conditions for improving quality of life. Among its most important elements are: water delivery system, as well as sewage treatment network and
Gładysz, Ryszard
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International Journal of Urban and Regional Research, EarlyView.Abstract While many African cities, such as Nairobi, fared comparatively well during the pandemic years, urban residents still faced compounded uncertainties and an unequal distribution of burdens that were infrastructurally co‐mediated, for example, within and through place‐specific waterscapes and their socio‐technical infrastructures.
Moritz Kasper +2 more
wiley +1 more source
“One Water”理念下南方多雨地区分流制污水管网提升改造思路
Jingshui jishu【目的】本文围绕“改善污水管网质量、提高污水处理厂进水浓度、改善城市水环境”的目标，针对南方多雨地区A城市水环境质量差的现象，分析得出主要问题是污水系统不健康。【方法】同时通过数据分析、水质调查、污水溯源、闭路电视(CCTV)管道内窥检测、水力模型模拟等方法分析了造成问题的主要成因：污水管网整体质量差、雨污混接明显，城市内涝导致涝水进入污水系统，污水管网的良好运维机制尚未建立等。【结果】提出了全域整治、雨污统筹、顶层保障等系统性对策，通过增加污水泵站降低末端污水管道埋深 ...
WANG Xianping, XIE Mingli
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Sand Bioreactors for Wastewater Treatment for Ohio Communities [PDF]
, 1999 PDF pages ...
Mancl, Karen M., Rector, Don
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International Journal of Urban and Regional Research, EarlyView.Abstract The Beqaa Valley in Lebanon has become increasingly polluted, and residents are attributing illness to improper waste disposal and dumping. This article explores local epistemologies of pollution’s causes and effects in three films, which were researched and produced by local residents of Bar Elias, a small town in the Beqaa, which has rapidly
Hannah Sender +2 more
wiley +1 more source
在线固相萃取-超高效液相色谱-紫外法同时测定水中的3种氯酚类化合物
Jingshui jishu【目的】文章采用在线固相萃取(online SPE)装置与超高效液相色谱-紫外检测器(UPLC-TUV)连接，建立了一种能同时测定原水和饮用水中3种氯酚类化合物(2, 4-二氯酚、2, 4, 6-三氯酚和五氯酚)的快速检测方法。【方法】样品经过滤膜简单过滤处理后，只需取5 mL样品即可直接上机检测。通过online SPE自动切换六通阀的方式，实现2根在线固相萃取柱Oasis HLB Direct Connect HP(20μm, 2.1 mm×30 mm)依次对样品进行富集和净化，
BI Fengli +4 more
doaj +1 more source
Dutch dilemma: Housing prices and flood risk exposure
Real Estate Economics, EarlyView.Abstract This article studies the impact of flood risk exposure on housing prices in a major river delta. Analyzing 1.8 million property transactions from 1998 to 2023 in the Netherlands, we find an average price discount of 1.1%. We observe considerable heterogeneity in price effects driven by exposure intensity, institutional settings that vary ...
Piet Eichholtz +2 more
wiley +1 more source
Jingshui jishu【目的】大型城市的排水设施运行模式趋于复杂，对于多节点入流污水厂，传统人工调度模式很难满足动态管理需求，需要研究智慧调度方式，保障排水设施的平稳运行。【方法】本文以上海某大型排水系统为例，通过分析末端收集历史数据，结合运行水位预设污水处理厂处理能力，根据实时来水数据动态调节末端各节点提升设施开泵情况，通过遗传算法对控制方程进行参数寻优，在所有世代中选出最高得分个体作为最终参数组合，确定雨天进厂流量策略。【结果】采用该优化策略后使污水厂处理水量更加平稳 ...
CHEN Yulin, ZHANG Xin
doaj +1 more source
Special Libraries, February 1929 [PDF]
, 1927 Volume 20, Issue 2https://scholarworks.sjsu.edu/sla_sl_1929/1001/thumbnail ...
Special Libraries Association
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