复合流人工浮岛系统植物与基质在污染水体修复中的作用

The Roles of Plants and Substrate in the Multi-Flow Artificial Floating Island for Surface Water Remediation

作为原位生态修复方法的一种,人工浮岛具有构建简单、操作管理方便、投资及运行费用低等优点,但较低的氮磷净化效率限制了其应用。由此,复合流人工浮岛作为一种新型的浮岛形式而发展起来。针对复合流人工浮岛的结构特征,综合论述了植物、基质及其他影响因素在复合流人工浮岛中的作用。在植物影响因素方面,主要论述了植物根系分泌物及微生物量、植物生长状态、泌氧能力、对氮磷富集能力及植物覆盖率的影响;在基质的作用方面,主要概括了基质的粒径、孔隙率、渗透系数和基质成分等物理化学参数及过水能力的影响。此外,对可能影响系统运行的水力梯度、温度及进水负荷等因素也进行了介绍。

As an in-situ ecological remediation technology, the artificial floating island（AF）with low constructing and operating cost is constructed simply and operated easily. However, the low removal efficiency for nitrogen and phosphorus is a great disadvantage for it to get a wide application. So multi-flow AFI which is a new article floating island was developed. In the aspect of plant effects, root secretion, microbial biomass, growth state, ability of radial oxygen loss, accumulation ability of nitrogen and phosphorus and plant coverage rate are discussed. In the aspect of constructing substratum, grain size, porosity, permeability and component were summarized. Besides, other factors including hydraulic gradient, temperature and hydraulic load were also considered.