共查询到7条相似文献,搜索用时 15 毫秒
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Design Methodology of Free Water Surface Constructed Wetlands 总被引:1,自引:1,他引:1
Simple criteria, guidelines and models are established for free water surface (FWS) constructed wetland selection and preliminary sizing. The analysis employs models for FWS constructed wetland design, considering simultaneously the removal requirements and the hydraulics of the system. On the basis of these models, a step-by-step methodology is developed outlining the design procedure for new and performance evaluation for existing FWS constructed wetland systems. This methodology is combined with simple equations predicting the maximum wetland capacity in summer, so as to assist designers in sizing installations in tourist areas with increased summer populations. Furthermore, this methodology is further simplified, based on sensitivity analysis of the unit area requirements for wastewaters of various strengths, and various design conditions and performance criteria. In addition, comparison of the unit area requirements of FWS constructed wetland systems, subsurface flow (SF) constructed wetland systems and stabilization pond systems for wastewaters of various strengths and design conditions, provides designers with general guidelines concerning the preliminary selection between alternative natural treatment systems in areas where the use of natural systems is favored because of their low-cost, simple operation and high removal performance. 相似文献
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人工湿地净化污水机理研究进展 总被引:3,自引:0,他引:3
人工湿地是一种新型的污水处理技术,它具有处理效率高、效果好、投入少、维持费用低等特点。重点阐述人工湿地净化污水的机理,提出了人工湿地技术未来的研究方向,并对其应用前景进行了展望。 相似文献
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利用芦苇和砾石构建太阳能曝气人工垂直潜流湿地处理生活污水。设定水力负荷400 mm/d,气水比10∶1,当进水氨氮(NH4-N)、总氮(TN)、溶解性反应磷(SRP)和总磷(TP)平均浓度为5.14,7.56,0.40,0.53 mg/L时,引入太阳能曝气后,各自的平均去除率分别提高24.8%,9.4%,15.7%和11.5%。随着气温下降和进水浓度降低,湿地微生物脱氮除磷能力下降,曝气对改善生活污水氮磷去除作用不显著。对试验系统而言,太阳能曝气湿地基本建设费用是无曝气湿地的2.85倍;但以20 a运行为基础折算出的污水处理费比无曝气湿地仅高0.02元/m3。综上,从污染去除性能和污水长期处理费用来看,太阳能曝气湿地在生活污水处理方面具有较好的技术经济优势。 相似文献
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水平潜流湿地对城市湖泊污水的净化分析 总被引:2,自引:0,他引:2
简要介绍了人工湿地的定义、分类和发展历史及现状,以西安市兴庆湖为研究对象,在水力负荷为0.5m3/(m2.d)和水深0.7 m时,分析水平潜流湿地对城市湖泊污水中的SS、COD、氮、磷等的净化效果,为人工湿地在西北地区城市湖泊的推广应用提供借鉴。 相似文献
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泥石流柔性防护系统对于中小型泥石流有很好的防治效果,但在实际工程中很容易发生破坏。为研究泥石流柔性防护系统破坏原因,介绍了泥石流柔性防护系统的构成与优势、破坏原理、破坏形式,并针对四川省道217某段公路改建工程的泥石流柔性防护工程,分析了系统的设计、构件、基础等方面的问题,得出主要破坏原因是设计不合理,未完全按照定型化设计,基础发生破坏,构件发生破坏。同时对泥石流柔性防护工程的设计提出了一些建议,以期提高其拦截能力。 相似文献