Phytoremediation of secondary canteen wastewater treatment by using water lettuce (Pistia stratiotes L.)

Abstract

The aim of this study was to investigate the removal efficiency of secondary canteen wastewater treatment by using water lettuce (Pistia stratiotes). The canteen wastewater was treated by biochar as a primary treatment. After primary treatment, canteen wastewater was diluted at the concentration of 0%, 25%, 50% and 75% and was treated by water lettuce for 15 days. The 7 parameters were determined in canteen wastewater; pH, BOD, COD, TKN, TP, TSS and FOG. For plants, biomass, total carbohydrate and protein content were determined. Water and plant samples were collected every 3 days at day 0, 3, 6, 9, 12 and 15. The results showed that the maximum removal efficiency of BOD, COD, TKN, TP, TSS and FOG at 25% of concentration were 94.06%, 93.34%, 38.36%, 66.83%, 100% and 6.45%, respectively. The highest biomass was 1.775 g (15 days). The maximum total carbohydrate and protein content of water lettuce were 0.35 and 0.42 g/g biomass, respectively. The result indicated that the highest removal efficiency by water lettuce was at 25% of the concentration of canteen wastewater.