Keywords: Lemna sp, wastewater treatment, Jordan, duckweed
The application of duckweed (Lemna sp.) in wastewater treatment in Jordan
A flowering plant called duckweed (Lemna sp.) has been used to upgrade the quality of wastewater at Khirbet As-Samra wastewater treatment plant, which is the largest in Jordan. It was originally designed to receive 68,000 m?/day but it is currently receiving 160,000 m³/day. Laboratory experiments showed that the average percentage removal efficiency of Total Coliform (TC) was 68%, Faecal Coliform (FC) 69%, Total Viable Count (TVC) 75%, BOD5 51%, NO3− 56%, TN 48%, organic nitrogen 46%, PO43− 56% and total phosphorus 50%. At the experimental site of Khirbet As-Samra, the results were 57, 59, 50, 44, 30, 26, 25, 28 and 26%, respectively, and the removal efficiency of NH4+ was 27%. Experimental results showed that Lemna gibba could be used to upgrade the quality of the pond effluent with respect to pathogens, biological oxygen demand, nitrogen and phosphorus. The results of this project will be the first of its kind in Jordan and it will establish a baseline for future research on the use of duckweed for wastewater treatment.