轮休措施对堵塞型垂直潜流人工湿地的影响

Influence of alternate operation on clogging in a vertical-flow constructed wetland

采用不可滤物质的定量化分析方法研究了采取轮休措施对人工湿地堵塞程度的改善效果,同时分析了轮休措施对垂直潜流人工湿地污染物去除效果的改变和植物生长的影响.结果表明,轮休措施对解决人工湿地的堵塞有明显地改善,采取轮休措施后单位基质中的不可滤物质含量较轮休前有所降低,其中不可滤有机物减少量十分明显,不可滤无机物量在短期和长时间轮休前后分别表现出基本稳定和较大幅度降低的特性;短期轮休后COD、TP和TN的去除率都较轮休前有所降低,氨氮的去除率在人工湿地轮休后较轮休前高;应结合人工湿地的基质、植物种类调整运行工况,进行不同时间长度和方式的轮休,以确保植物生长不受该措施的影响.

The improvement of filtration in vertical - flow constructed wetlands by alternate operation was analyzed quantitatively. The effects of the alternate operation on pollutant removal, as well as the influence on plant growth, were studied. The research findings indicate that alternate operation is effective in resolving clogging in the vertical-flow constructed wetlands. The content of unfilterable material in the substrates is reduced by using alternate operation measures. The reduction in both unfilterable organic and inorganic materials is very obvious by using long term alternate operation measures. However, the amount of reduced unfilterable inorganic material is basically unchanged if a short alternation period （ I d or 2d） is used. By using short term alternate operation measures, the removal rate of COD, TP and TN will be reduced and the removal rate of ammonia will be increased. To ensure that the alternate operation measures do not hinder plant growth in the vertical-flow constructed wetlands, the cycle time and methods of alternate operation should be taken into consideration according to the tvoes of substrates treated and olants oresent.