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苏州某黑臭河道位于城乡结合区域,由于河道南侧雨污分流区存在雨污混接和商铺私接问题,河道北侧合流制区存在通河排口和管底标高不匹配等问题,河道受污染严重,水体颜色发黑,底泥上浮并伴随着恶臭气味.以该河道为例,通过"正向排查,反向溯源"、截污纳管和污染源削弱等岸上工程配合河道生态修复措施进行河道综合治理.结果表明通过以上治理措施,河道水质可稳定达到消除黑臭目标,水体透明度从20 cm提升至50 cm,氨氮去除率最高达到71.4%,部分水质指标达到《地表水环境质量标准》(GB 3838-2002)Ⅳ类水体标准. 相似文献
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论述了滨州市张肖堂干渠污染现状,全面分析了张肖堂干渠水体黑臭的原因,提出截污纳管、清理疏浚,垃圾清运等工程治理措施,可显著改善河道水质。 相似文献
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人湖河道治理是滇池污染治理的重要措施之一,通过开展截污、清淤、生态河堤治理、入湖口湿地等工程建设,达到改善滇池水环境的目的。本文以西坝河截污及水环境治理工程为例,调查分析河道污染状况及成因,研究物理法、化学法以及生物一生态技术等污染治理技术的适用性,并加以综合应用,最终实现减少流人滇池的城市污染负荷、改善河道水质及周边环境、提升河道行洪能力的综合治理目标。 相似文献
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加拿大微生物技术在上海市中心城区黑臭河道治理中的应用 总被引:1,自引:0,他引:1
本文详细叙述了加拿大微生物技术在上海市中心城区黑臭河道治理中的应用。应用成果表明,在上海市中心城区一些"断头浜"无法完全截污,少量生活污水侵入河道水体的边界条件下,采用加拿大高效微生物技术可以在短时间内有效地降解底泥,消除河水黑臭,恢复河道的生态系统,提高水体自净能力。 相似文献
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通过对南通市区5条主要河道柱状底泥样品重金属元素质量比的实验分析,探讨河道重金属污染的分布特征,并进行潜在生态风险评价。结果表明:①各重金属元素质量比均超过土壤背景值,污染较重,其中Hg污染最为严重;②重金属污染在垂直分布上分为未受干扰、正常沉积的"表层高、底层低"和受清淤治理措施影响的非正常沉积的"表层低、底层高"两种分布格局,在水平分布上具有"城市中间河流高、外围河流低"和"中上游河段高、下游河段低"的分布特征;③从重金属污染的潜在生态风险看,濠河和法伦寺河潜在生态风险强,姚港河生态风险中等,任港河和南川河生态风险轻微。各重金属元素对生态风险的影响程度大小依次为:HgCuZnCrPb。 相似文献
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对东莞市麻涌镇新基水系、东太水系、大步水系3条中小河流底泥中重金属含量应用污染负荷指数法进行了评估研究,为中小河流清淤疏浚、淤泥处理处置提供科学依据。结果表明:新基、东太、大步水系综合污染等级分别为III级、 I级和II级;Cd、 Cu污染较为普遍和严重。 相似文献
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The new model ArcEGMO-URBAN aims at deterministic and spatiotemporal modelling of water, nitrogen and phosphorus fluxes from all urbanised areas of a river basin considering all potential sources. Pollution loads are calculated for discrete urban patches and balanced on the level of hydrological subbasins. Modelling results can be defined by the user of any level of spatial and/or temporal aggregation, e.g. matter balances for river basins or river sections and years or months, respectively. To process spatial data, a Geographic Information System is linked to the model. Information on urban land use and general characteristics of river basins is based on digital coverages, partly generated from remote-sensing data. Moreover, statistical data, e.g. on population, sewer systems, wastewater treatment plants etc. are included. Stormwater runoff from impervious surfaces is calculated as one input to the sewer network. Wastewater is considered with its main sewer system, pumping stations and treatment plants. Finally, the discharge is balanced for discrete river sections. Modelling results attest ArcEGMO-URBAN its ability to realistically quantify matter fluxes and major pollution sources as well as their seasonal variation. This makes the model an applicable tool for the analysis of scenarios with e.g. varying population distribution or climatic and technological conditions. 相似文献
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For three years (2001 - 2003), sediment samples were extracted from about 100 silt traps (STs) spread out all over the combined sewer network of Paris. These STs, whose volume varied from 21 to 325 m3, were cleaned out as soon as their filling capacities were reached. All these sediment samples were analysed for physicochemical parameters (pH, organic matter (OM) content, grain size distribution), total hydrocarbons (THs), 16 polycyclic aromatic hydrocarbons (PAHs) selected from the priority list of the US-EPA, and heavy metals (Al, Ag, As, Cd, Cu, Cr, Sn, Fe, Mn, Hg, Ni, Pb, Zn). For each silt trap, six sediment samples were extracted before the clean out procedure: three samples were extracted from the sediment surface (5-10 cm depth) and three other samples were extracted from a deeper sediment layer (approximately at 1 m depth). The location of these sampling points allowed us to take into account the possible spatial fluctuation of pollutant loads in each ST. The first results showed that there were some important inter-site variations of pollutant contents. These variations have to be taken into account by the sewer manager for the fate of the ST sediments. Therefore, we decided to assess the grain size distribution of some pollutants. OM, heavy metals and PAHs have been investigated on the five grain size fractions (> 20 mm, 8-20 mm, 0.5-8 mm, 50-500 microm, < 50 microm) for 9 STs, which have been selected on their heavy metal content basis. This work aims at understanding the distribution of the pollutant contents and at improving the knowledge of the ST sediment pollution. 相似文献
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珠三角中小河流水环境污染问题日益突出,水生态环境受到极大影响。结合珠三角地区河道水生态环境现状,对水生态修复对策进行了初探,包括加强源头控制、完善城镇污水收集及处理、面源污染治理、开展重点区域水生态系统修复、建设滨水区及加强系统管理等措施。最后简要介绍了茅洲河界河综合治理工程案例,该工程充分考虑了两岸排涝、堤防、道路交通、截污治污和岸线美化等内容,工程设计遵循自然、人水和谐的理念,可为中小河流水生态修复提供参考。 相似文献
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An experimental on-site observatory of urban pollutant loads in combined sewers was created in the centre of Paris to quantify and characterise the dry and wet weather flow in relation to spatial scale. Eight rainfall events were studied from April 2003 to May 2004. Samples were analysed for suspended solids, organic matter, nitrogen and heavy metals. Results confirm the extent of wet weather pollution. They have shown the relative homogeneity of SS and organic matter characteristics from one urban catchment area to another. Two groups of heavy metals were identified. The first one concerns Cu, which has a higher concentration in wet weather flow (WWF) than in dry weather flow (DWF), and runoff. The second includes Cd, Pb and Zn, where higher concentrations were measured in urban runoff than in WWF and DWF. A first evaluation of contribution of wastewater, urban runoff and sewer deposit erosion sources to wet weather pollution was established and has highlighted the contribution of wastewater and sewer deposits to this pollution. However, it has shown that sewer deposit erosion remains an important source of wet weather pollution at different spatial scales. 相似文献
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黄河泥沙对氮迁移转化的影响及环境效应 总被引:3,自引:0,他引:3
黄河具有高泥沙含量的特点,泥沙对营养元素和污染物的迁移转化具有重要的影响。含氮化合物是我国河流的主要污染物之一,是国家重点防控污染物,是影响河流水体健康的重要因素。本文基于实验室模拟实验和野外采样研究成果系统综述了泥沙对河流氮迁移转化的影响及其环境效应。重点分析了(1)黄河水体含氮化合物的时空分布特征及来源;(2)含氮化合物的悬浮泥沙-水界面过程以及悬浮泥沙对氮转化过程的促进作用;(3)悬浮泥沙含量和粒径等对有机氮降解、硝化作用、反硝化作用、耦合硝化反硝化作用以及厌氧氨氧化作用的影响;(4)泥沙对温室气体N_2O产生和排放的影响,以及(5)水沙条件变异对氮迁移转化作用的影响。研究结果可为气候变化和人类活动双重作用下河流氮污染治理以及温室气体的排放控制提供科学依据。 相似文献
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底泥污染是造成茅洲河流域水质黑臭的关键因素之一。本文通过对底泥勘查取样检测,采用底泥沉积物单因子污染指数法对底泥营养盐污染进行分析评价,结果显示,营养盐、有机质污染均达到了重度污染等级。采用单一重金属潜在生态风险系数和多金属潜在生态风险系数法对重金属污染程度进行分析评价,结果显示,重金属污染达到了极强生态风险等级。根据底泥污染程度的不同,结合垂向变化分析,确定了不同区域底泥达标清淤深度在0.7~2.5m之间,继而确定了清淤量为331万m3,为茅洲河流域污染底泥清淤提供了可靠依据。其研究路线、方法可为类似工程参考。 相似文献