Pollutants Balance In Constructed Wetlands for Treating Hydroponic Waste Solution Containing High Nitrate From Greenhouses In South Korea.

The water pollutant balance was analogized to know treatment tendency according to the treatment time. The total influent amount of hydroponic wastewater was 0.26~0.34 m³ day^-1 on the average for two years, the amount of hydroponic wastewater evapotranspiration was 15~18% in hydroponic wastewater treatment plant. In the case of COD balance, the inflow was 2.27~2.33 kg year^-1 in hydroponic wastewater treatment plant. 34.4~34.8% of COD in 1^st HF bed was treated. And 45.4~46.8% of COD in 2^nd HF bed was treated. Therefore, the outflow of 0.43~0.46 kg year^-1 in COD was 18.5~20.3% in hydroponic wastewater treatment plant. In the case of T-N balance, the inflow was 8.74~11.67 kg year^-1 in hydroponic wastewater treatment plant. 21.3~24.3% T-N in 1^st HF bed was treated. In 1^st HF bed, 0.27~0.5% of T-N by water plant, 2.49~6.64% of T-N by filter media and 17.2~18.7% of T-N by the others were treated, respectively. And 37.5~37.7% T-N in 2^nd HF bed was treated. In 2^nd HF bed, 0.26~0.49% of T-N by water plant, 5.26~5.60% of T-N by filter media and 31.8~32.5% of T-N by the others were treated, respectively. Therefore, the outflow of 3.33~4.78 kg year^-1 in T-N was 38.2~41% in hydroponic wastewater treatment plant. In the case of T-P balance, the inflow was 1.44~1.71 kg year^-1 in hydroponic wastewater treatment plant. 62.2~63.2% T-P in 1^st HF bed was treated. In 1^st HF bed, 0.97~1.33% of T-P by water plant, 20.1~41.5% of T-P by filter media and 19.3~42.4% of T-P by the others were treated, respectively. 29.9~32.1% T-P in 2^nd HF bed was treated. In 2^nd HF bed, 0.81~1.1% of T-P by water plant, 8.3~30.4% of T-P by filter media and 0.58~20.8% of T-P by the others were treated, respectively. Therefore, the outflow of 0.1 kg year^-1 in T-P was 5.8~6.9% in hydroponic wastewater treatment plant.