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.
