河岸混合植物带处理受污染河水中试研究

利用2种混合植物带(香根草+沉水植物、湿生植物+香蒲+芦苇)对受污染河水进行中试研究,并与无植物空白带进行了对比.结果表明,混合植物带对污染物的降解效果优于无植物空白带,其中香根草+沉水植物带效果最好,它在整个运行期间对COD、NH₄⁺-N和TP的去除率分别为43.5%、71.1%和69.3%.对出水溶解氧及水温进行了考察,结果表明混合植物带水域中水的溶解氧比无植物带稳定,且在夏季水温低于无植物带水域的水温.说明在河道修复中植物带对平衡河岸带环境条件、改善河流局部小气候有重要作用.

Pilot-Scale Study on Riparian Mixed Plant Zones Treating Polluted River Water

The polluted river water is treated with pilot-scale riparian zones of no aquatic plant,Vetiveria zizanioides+submerged plants,and weed+Typha angustifolia L.+Phragmites communis.It is shown that the vegetation water zones are better than the no vegetation water zone and Vetiveria zizanioides+submerged plants zone is the best in improving water quality.The average removals of the Vetiveria zizanioides +submerged plant zone is 43.5% COD,71.1% ammonia and 69.3% total phosphorus respectively.The dissolved oxygen(DO) and temperature of effluents from the three water zones are also investigated.It shows that DO of effluent from the vegetation zones are more stable than that of effluent from the no vegetation zone,and the temperature of the effluent from the vegetation zones are lower than that from the no vegetation zones.The submerged plants have special role in water quality improvement,and should be studied further.