Duckweed treatment system for swine wastewater is becoming popular in developing countries due to its eco-friendliness and low cost. However, pathogens removal has rarely been considered. The aim of this study is to assess the state of pathogens in two different lab-scale systems with continuous flow and batch modes. Both systems are designed by two parallel lines of ponds, one line contains duckweed, the other line was self-treatment control. In 3.5 days, the duckweed line of the continuous flow system reduced E. coli and total coliforms by 2.8 log_(10) and 2.35 log_(10) , respectively. In the duckweed line of batch system, concentration of E. coli and total coliforms decreased by 1.63 log_(10) and 1.58 log_(10) , respectively, which were slightly higher than the control without duckweed 0.48 log_(10) and 0.41 log_(10) . In addition, the reduction of FRNA phage (3.79 log_(10) PFU/mL) in duckweed system was 2 times higher than the control line. Ammonium and turbidity reduction with duckweed was also higher than the controls in both configurations. The study indicated that lines with duckweed were more effective at reducing E. coli, coliform, FRNA phages than lines without duckweed.
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