Optimum Configuration, Filter Media Depth and Wastewater Load of Small-scale Constructed Wetlands for Treating the Hydroponic Waste Solution in Greenhouses
2008
Park, W.Y. (Gyeongsang National University, Jinju, Republic of Korea) | Seo, D.C. (Louisiana State University, Baton Rouge, LA, USA) | Lim, J.S. (Gyeongsang National University, Jinju, Republic of Korea) | Park, S.K. (Gyeongsang National University, Jinju, Republic of Korea) | Cho, J.S. (Sunchon National University, Sunchon, Republic of Korea), E-mail: [email protected] | Heo, J.S. (Gyeongsang National University, Jinju, Republic of Korea), E-mail: [email protected] | Yoon, H.S. (Gyeongsangnam-do Agricultural Research and Extension Services, Jinju, Republic of Korea)
To obtain optimum configuration, depth and load of constructed wetlands (CWs) for treating of hydroponic waste solution (HWS) which was produced in greenhouses, the study was conducted with 4 kinds of combined systems such as Vertical flow (VF)-Horizontal flow (HF), VF-VF, HF-VF and HF-HF CWs. In four configurations of CWs, the treatment efficiency of pollutants from HWS under depth of HF and VF beds, HWS loading and HWSs were investigated. Removal rate of pollutants under different depth of VF and HF in 2-stage hybrid CWs was in the order of 50 cm less than 70 cm regardless of CWs configuration. Removal rate of pollutants under HWS loading in 2-stage hybrid CWs was in the order of 150 L m-² day-¹ approximately equal to or the image of 300 L m-² day-¹ greater than 450 L m-² day-¹. The optimum depth and HWS loading were 70 cm and 300 L m-² day-¹ in four configurations of CWs, respectively. Using this optimum condition, for various HWSs (cucumber, paprika and strawberry HWS), removal rate of pollutants in HF-HF CWs was higher than that in HF-VF CWs. Optimum configuration of 2-stage hybrid CWs for treating hydroponic waste solution in greenhouses was found out to be HF-HF CWs. Therefore, under the optimum conditions, removal rate of BOD, COD, SS, T-N and T-P in HF-HF CWs were 84, 81, 84, 51 and 93%, respectively.
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