Utilization efficiency of constructed wetlands in effluent removal and nile tilapia growth under different hydraulic load rates [electronic resource]

Includes bibliographic reference

The experiment was carried out at two stages. First stage, determine the optimum hydraulic loading rate and second stage, determine fish growth parameters. Wetland cell was filled with three layers of gravel. the bottom layer coarse gravel (ϕ 30 -50 mm) with height 0.3 m, the middle layer fine gravel (ϕ10 -20 mm) with height 0.2 m and the upper layer (soil) with height 0.05 m. Three hydraulic loading rates (4.8, 9.6 and 19.2 m day•1) were used in the present study. The data obtained were subjected to one-way analysis of variance (using SPSS program) to test the effect of the inflow and outflow nutrient concentration. The results indicated that the total ammonia nitrogen (FAN) concentration was significant variation among the hydraulic loading rates treatments and control. It was observed significantly highest in hydraulic loading rate 4.8 m day•1. Total Ammonia Nitrogen concentration increased with increasing hydraulic loading rates among treatments, whereas TAN values were 0.18, 0.21 and 0.23 mg ll at hydraulic loading rates 4.8m 9.6 and 19.2 m day•1 respectively. The results indicated that the nutrient to area loading (AL) and area retention (AR) increases with increasing the hydraulic load for most of the measured nutrient parameters

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