会议专题

Retention Performance of a Constructed Wetland asMeasured Automatically with Sensors

Constructed wetlands (CWs) are recognized as a useful method to reduce sediment and nutrient loading from arable land to surface waters. In our previous (1999–2000) study based on water sampling, the Hovi CW in southern Finland was found effective. In October 2007, sensors recording height, turbidity and nitrate-nitrogen (NO3-N) concentration of the water entering and exiting the Hovi CW were installed. Here, experiences and results of the first one-year period of the sensor-based measurements are presented and compared with previous results. Total suspended solids (TSS) and total phosphorus (TP) retentions (70% and 67%, respectively) were at similar level as in the previous measurements. Meanwhile NO3-N and dissolved reactive phosphorus (DRP) retentions (67% and 60%, respectively) were strongly increased. The improved retention of dissolved nutrients suggests (i) the effects of more abundant vegetation that has developed in the Hovi CW and (ii) that the high P retention capacity of the CW soil does not yet show any signs of exhaustion. Our experiences of CW measurements with sensors have been positive. The information obtained with new technology has not only provided more accurate retention figures, but also given new insight on the behavior of solid material and nutrients in a CW.

constructed wetlands sensors turbidity nitrate phosphorus retention

Jari KOSKIAHO Markku PUUSTINEN Niina KOTAM(A)KI

Finnish Environment Institute,PO Box 140,FIN-00251 Helsinki,Finland Finnish Environment Institute,Survontie 9 D315.2,FIN-40500 Jyv(a)kyl(a) Finland

国际会议

2009 International Symposium on Environmental Science and Technology(2009环境科学与技术国际会议)

上海

英文

21-30

2009-06-02(万方平台首次上网日期,不代表论文的发表时间)