Nutrient Reduction and Productivity Studies in Low Strength Freshwater Aquaculture Wastewater Using Lemna Gibba (Duckweed) System

Abstract

The use of macrophytes plants for treatment of wastewater for nutrient removable is addressed A stuoy was conducted to ascertain the nutrient reduction potential in freshwater aquaculture using Lemna gibba (Duckweed) Experiments were conducted with plastic trays of dimensions 34 27 y 6 cm Wastewater from freshwater aquaculture was collected and experimented under different dilutions. Nutrient removal and productivity of the Lemna gibba system were studied for a period of ten days. the experiments were conducted over a period of SO days The nutrient removal patterns were obtained for ammonia-nitrogen, nitrite, nitrate and phosphate Reductions in nutrient in the Lemna gibba system are higher in raw wastewater compared to dilutions. Ammonia nitrogen had maximum removal efficiency followed by nitrate, nitrite and phosphate. Biomass productivity was also higher in the raw wastewater series than with dilutions. The studies indicated the survival of Lemna gibba in low nutrient loading conditions and also as a potential biomass resource

Keywords

• Duckweed
• Lema gibba
• Freshwater aquaculture
• Nutrient reduction
• ammonia-N
• nitrate