水生态学杂志Issue(6)：93-98,6.
二级生物措施削减面源污染负荷的初步试验
Assessment of a Two-stage Constructed Wetland for Removal of Non-point Source Pollutants
摘要
Abstract
Constructed wetlands are widely used for removing and mitigating non-point source pollution in aquatic systems.The plants in a constructed wetland play the primary role in water purification.Research has shown that the purification capacity of constructed wetlands cannot be increased much by manipulation of plant species due to limits on the rate of nutrient uptake and primary production.However, research has also shown that adding aquatic animals to the wetland can enhance water purification and increase water clarity.In this study, we assessed the ef-fectiveness of a two-stage constructed wetland for removal of non-point source pollutants.The study was carried out in Wuhan from June to November of 2012 on a constructed wetland receiving 120-900 m3/d of runoff water from Liangzi Lake.The study area was 4 657 m2 , with a 2 844 m2 first-stage wetland and a 1 813 m2 second-stage wet-land.In June and July, the wetland had no aquatic plants or animals present.In early August, Iris tectorum, Typha orientalis Presl, Pontederia cordata and Thalia dealbata were planted in the first-stage of the wetland and Canna indica L, Typha orientalis Presl, Iris tectorum and Nymphaea alba were planted in the second-stage of the wetland.During August and September, water was tested while being purified by aquatic plants.At the end of Sep-tember, three filter feeding animal species were added to the second-stage wetland, one mussel species and two species of carp;Hyriopsis cumingii ( number, 1 747;density, 1.4 ind/m3 ) , 280 Hypophthalmichthy smolitrix and 80 Hypophthalmichthys nobilis (initial weight, 80-120 g;density, 28.3 g/m3).During October and November, water purification was carried out by both aquatic plants and animals.Physicochemical parameters of the water body in the experimental zone were monitored from June to November 2012.During August and September, the removal rates of TN, TP, NH3-N, Chl-a and CODMn were 24.9%, 42.6%, 20.0%, 21.4% and 8.2%, respectively. During October and November, the removal rates of those parameters were 33.0%, 45.2%, 17.9%, 34.3%and 11.6%.Results indicate that the biological purification system was quite effective at removing TN, TP and Chl-a. Integrated analyses of all indices shows that biological treatment effectively removed non-point source pollutants and that the aquatic animals enhanced water purification in the constructed wetland ecosystem.关键词
生物措施/水质净化/面源污染Key words
biological control/water purification/non-point source pollution分类
资源环境引用本文复制引用
邹曦,郑志伟,张志永,彭建华,万成炎,丁庆秋,胡莲..二级生物措施削减面源污染负荷的初步试验[J].水生态学杂志,2014,(6):93-98,6.基金项目
水利部公益性行业科研专项（201101063）；国家自然科学基金项目（51209147）。 （）
