...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Environmental Engineering >Wavy Subsurface Flow and Vertical Flow Constructed Wetlands: Effects of Aeration and Wastewater Composition on Wetland Clogging
【24h】

Wavy Subsurface Flow and Vertical Flow Constructed Wetlands: Effects of Aeration and Wastewater Composition on Wetland Clogging

机译：波浪状地下流和垂直流人工湿地：曝气和废水成分对湿地堵塞的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

In this study, effects of aeration and wastewater composition were evaluated on the clogging process in four laboratory-scale wavy subsurface-flow and vertical-flow constructed wetlands (WSVFCWs) used for secondary and tertiary treatment. The relationship between the accumulated solid material and infiltration rate, the content and particle size distribution as well as the ratio of organic and inorganic matter of the accumulated material in the filter media were determined, and the mechanisms of clogging were elucidated. The clogging mainly occurred in the upper 0-40 cm layer, and the accumulated material decreased with filter depth (along the flow direction). The main particle size contributing to clogging was similar to 40 mu m in the WSVFCWs for secondary treatment and >110 mu m in those for tertiary treatment. The accumulated material had 30-40% of organic matter. The clogging mechanisms varied as the composition of influent and aeration conditions are different in WSVFCWs. Aeration promoted the growth of biofilm and mineralization of the accumulated material as well as provided shear force in the WSVFCWs. Aeration has a good effect in extending operational time in the tertiary WSVFCW but has a mild effect in the secondary WSVFCWs because of high organic loading rate there. Both the organic and suspended solids (SS) loading rate are important factors and should be controlled to mitigate the clogging problem in WSVFCWs. (C) 2015 American Society of Civil Engineers.
机译：在这项研究中，评估了曝气和废水成分对用于二级和三级处理的四个实验室规模的波浪状地下流和垂直流人工湿地（WSVFCW）的堵塞过程的影响。确定了滤料中固体物质的累积量与入渗率，含量和粒径分布以及有机物和无机物的比值之间的关系，并阐明了堵塞的机理。堵塞主要发生在上部0-40 cm层，并且累积的物质随过滤器深度（沿流向）而减少。造成堵塞的主要颗粒尺寸在用于二次处理的WSVFCW中约为40微米，而在第三次处理中则大于110微米。累积的材料具有30-40％的有机物。由于WSVFCW中进水和通气条件的组成不同，堵塞机理也有所不同。曝气促进了生物膜的生长和累积物质的矿化，并在WSVFCWs中提供了剪切力。曝气在延长第三级WSVFCW的运行时间方面有很好的效果，但由于二级WSVFCW的有机负载率高，因此通气效果中等。有机和悬浮固体（SS）的加载速率都是重要因素，应加以控制以减轻WSVFCW的堵塞问题。 （C）2015年美国土木工程师学会。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号