Designing Metallic Iron Packed‐Beds for Water Treatment: A Critical Review          下载免费PDF全文

Chicgoua Noubactep 《洁净——土壤、空气、水》2016,44(4):411-421

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海水黄色物质吸收系数测量中的关键问题探讨     

蔡晓晴  汪小勇  孟洁 《海洋技术学报》2017,36(5):83-88

黄色物质是海洋中的有色可溶性有机物,是重要的水质参数之一。目前实验室黄色物质样品测量技术虽已有标准参考,但测量过程的一些重要变量对测量结果的定量影响仍未明确。基于2016年东印度洋南部水体综合调查所得的实测样品,分析了参比纯水是否过滤和过滤压力等因素对测量结果准确性的具体影响,发现:(1)参比纯水未过滤会使测量结果明显高估,ag(350)和ag(440)的高估程度分别为0.137 m~(-1)和0.114 m~(-1);(2)过滤压力的不同对测量结果影响较为明显,过滤压力越大,测得的吸收系数越大,对于a_g(350),150 mm Hg相对100 mm Hg的平均偏差为0.195 m~(-1),200 mm Hg相对150 mm Hg的平均偏差为0.058 m~(-1);对于ag(440),150 mm Hg相对100mm Hg的平均偏差为0.168 m~(-1),200 mm Hg相对150 mm Hg的平均偏差为0.064 m~(-1)。本文的实验研究可促进实验者对规范中黄色物质样品处理过程以及相关参数设置原因和意义的理解。  相似文献   

Biodegradation of Polychlorinated Biphenyls Using a Moving‐Bed Biofilm Reactor          下载免费PDF全文

Bin Dong  Han‐Yu Chen  Yang Yang  Qun‐biao He  Xiao‐Hu Dai 《洁净——土壤、空气、水》2015,43(7):1078-1083

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Performance of a Grey Water Pilot Plant Using a Multi‐Layer Filter for Agricultural Purposes in the Jordan Valley          下载免费PDF全文

Ayoup M. Ghrair  Othman A. Al‐Mashaqbeh  Sharon B. Megdal 《洁净——土壤、空气、水》2015,43(3):351-359

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Performance of an Integrated Treatment System for Clean Drinking Water Production          下载免费PDF全文

Shams Ali Baig  Tiantian Sheng  Jianwen Zhu  Xinhua Xu 《洁净——土壤、空气、水》2015,43(11):1450-1454

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药剂与粉煤灰联合处理再生造纸废水的实验研究   总被引：2，自引：1，他引：1  

赵晓波  邹友琴  孔德馨  罗进洲 《吉林大学学报(地球科学版)》2004,34(2):255-259

通过混凝实验探讨了用PAC处理再生造纸废水的最佳混凝条件.在此基础上,选用PAM为助凝剂,通过正交实验,获得了较佳的水平条件:先加PAM,质量浓度为3 mg/L,后加PAC,质量浓度为0.2 g/L,反应9 min;处理后的出水经粉煤灰过滤,ρ(COD)可降至37.383 mg/L,ρ(BOD)为20.7 mg/L,浊度为0,pH为11.12,在空气中放置24 h后pH变为8.02.  相似文献   

Shear-induced pressure changes and seepage phenomena in a deforming porous layer – I     

N. Petford  M. A. Koenders 《Geophysical Journal International》2003,155(3):857-869

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Influence of hydropower outflow characteristics on riverbank stability: case of the lower Osage River (Missouri,USA)   总被引：1，自引：0，他引：1  

Wesam Mohammed-Ali  Cesar Mendoza  Robert R. Holmes Jr. 《水文科学杂志》2020,65(10):1784-1793

ABSTRACT

This research examined the influences of outflow characteristics affecting riverbank stability. The 130-km stretch of the Lower Osage River downstream from Bagnell Dam (Missouri, USA) provided an excellent case study for this purpose. The integrated BSTEM model with the HEC-RAS model was accurately calibrated and validated with data from the US Geological Survey. Then, the outflow characteristics (peak flow duration, flow drawdown rate, and low flow duration) were investigated individually. The results of this study showed that: (1) riverbank stability is little affected by the duration time of the peak flow, especially on the reaches far from the dam; (2) sudden flow drawdown significantly reduces riverbank stability; however, the impact of the drawdown rate decreases with distance from the dam; and (3) the duration of the low flow after peak flow influences the riverbank stability value proportional to the distance from the dam. The time of low flow before failure increases as the distance from the dam increases.  相似文献   

河流污水非饱和入渗对沿岸地下水质的影响   总被引：4，自引：0，他引：4       下载免费PDF全文

梁斌  王超  王沛芳  钱进  郑晓英 《水科学进展》2003,14(5):548-553

在分析河流污水非饱和入渗过程和输移机理的基础上,建立了河流污水非饱和入渗对沿岸土壤及地下水质影响的预测预报模型。该模型将水力传导率分离为饱和水力传导率项和相对水力传导率项,并运用全隐式差分和时间中心差分格式分别离散,计算过程中根据土壤饱和度调用不同格式,克服真解波动和耗散现象。取得了良好效果。以江苏省徐州市奎河的徐村和黄桥河段污水中的保守性污染因子Cl-和非保守性污染因子氮为例,研究非饱和入渗污染物在土壤及地下水中迁移转化过程的模拟模型参数,运用所率定的参数进行预测计算,计算值与相关的实测值进行对比分析,结果表明,两者吻合良好。  相似文献   

Patterns of Coping and Adaptation Among Erosion-Induced Displacees in Bangladesh: Implications for Hazard Analysis and Mitigation     

Hutton  David  Haque  C. Emdad 《Natural Hazards》2003,29(3):405-421

The purpose of this research was to identify social, culturaland psychological aspects of riverbank erosion-induced displacement in the flood plainsof Bangladesh. Although considerable research has examined the social and economicimpacts of riverine hazards in Bangladesh, there has been a general neglect of associatedpsychosocial implications. The specific objectives of the study were to: (1) assess hazardawareness in relation to riverbank erosion, (2) determine the magnitude of psychologicaldistress associated with displacement, and (3) identify patterns of psychosocial copingand adaptation common to displaced persons in Bangladesh. Although displacees were foundto have a significantly higher level of distress than non-displacees, this was relatedprimarily to socioeconomic deprivation rather than to displacement per se. The findingsof this study showed that the constant threat of riverbank erosion has contributed to asubstantial disaster subculture in the riverine zones of Bangladesh. The commonly hypothesized factorssuch as loss of land and frequency and duration of displacement were notsignificantly associated with distress levels.The need to integrate into hazard analysis and mitigation studiesa social, cultural and psychological context is recommended. In Bangladesh, the poor copewith hardship and problems by relying on religion, which in turn significantlyinfluences how they perceive and interpret natural calamities. It is argued that the capacityof people to respond to environmental threats is a function of not only the physicalforces which affect them, but of indigenous social and cultural belief systems which influencehow people interpret and organize their activities. Hazard analysis and mitigation wouldbe most effective when it takes into account psychological and socio-cultural aspects ofdisasters, due to the fact that psychological distress impacts the capacity of people toachieve livelihoods, but also important social and psychological processes determine the waypeople perceive and adapt to natural hazards.  相似文献