摘要
为了研究水位变化对垂直流人工湿地净化效果的影响,2个填充复合基质的湿地同步运行。湿地上层均为厚35cm、粒径5~10mm的炉渣;中层为厚度35cm的砾石,粒径分别为10~20(湿地1)和5~10mm(湿地2);底层均铺设厚15cm、粒径50~100mm的粗砾石作为支撑层;湿地表面种植黄花鸢尾。研究期间2个湿地均为连续进水,设置6个运行水位:85、66、51、36、19和2cm。结果表明,2个湿地系统对COD、NH_4^+-N、TN和TP的去除率分别为:50.5%~81.1%、34.1%~84.6%、29.1%~75.7%和49.1%~84.6%。统计分析表明,水位对污水中有机物及氮的去除有显著影响(P<0.05),36cm水位时TN去除率最高,湿地1和湿地2分别达到68.8%和75.7%;85cm水位时NO_3^--N去除率最高,湿地1和湿地2分别为95.5%和96.6%;2cm水位时COD和NH_4^+-N的去除率最高,湿地1分别为75.9%和81.1%,湿地2分别达到79.4%和84.6%。以上结果表明,通过改变垂直流人工湿地的水位可以有效地改变污染物的去除效果。湿地2对磷的净化效果显著高于湿地1(P<0.05)。
In order to investigate the effect of water level on the performance of vertical flow constructed wetland filled with composite substrate, two laboratory scale wetland beds were operated in parallel exper- iments. Both beds were filled with coal burn slag （5 - 10 mm in diameter） in the upper layer （35 cm thick）, while in the lower layer （35 cm-thick）, one bed （CW1） was packed with coarse gravel （10-20 mm） and the other bed （CW2） with fine gravel （5-10 mm）. Both beds were planted with Iris wilsonii and operated in continuous flow mode with six water levels= 85, 66, 51, 36, 19 and 2 cm. Average remov- al efficiencies of the wetlands were as follows. COD 50. 5-81.1%, NH＋ --N 34.1%-84. 6%, TN 29.1-75.7% and TP 49.1-84. 6%. The statistical results showed that the water level had a signifi- cant effect on the removal of organic matter and nitrogen （P 〈 0.05）. At water level of 36 cm, the wet- land systems performed most efficiently for TN removal （CW1=68.8%, CW2=75.7%）. The highest re- moval efficiency of NO3--N was occurred at water level of 85 cm, and the removal efficiencies were 95.5% for CWl and 96.6% for CW2. High NH＋ --N and COD removal was obtained when water level was 2 cm, achieving removal efficiencies of 75.9%, 81. 1% and 79.4%, 84. 6%, respectively. The remov- al efficiency of phosphorus in the wetland with fine gravel was significantly higher than that with coarse gravel （P〈0.05）.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2016年第8期116-121,共6页
Periodical of Ocean University of China
基金
国家水体污染控制与治理科技重大专项(2014ZX07203-008)资助~~
关键词
垂直流人工湿地
水位
复合基质
饱和区
vertical flow constructed wetlands
water level
composite substrate
saturated zone
