UTILIZATION EFFICIENCY OF CONSTRUCTED WETLANDS IN EFFLUENT REMOVAL AND NILE TILAPIA GROWTH UNDER DIFFERENT HYDRAULIC LOAD RATES

Document Type : Original Article

Authors

1 Assoc. Prof., Agric. Eng. Dept., Fac. of Agric., Kafrelsheikh Univ., Egypt.

2 Prof. of Agric. Eng. Dept., Faculty of Agric., Kafrelsheikh Univ., Egypt.

Abstract

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 (f 30 – 50 mm) with height 0.3 m, the middle layer fine gravel (f 10 – 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 ofthe inflow and outflow nutrient concentration. The results indicated that the total ammonia nitrogen (TAN) 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 l-1 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. The total nitrogen (TN) removal values were 7.1, 9.5 and 13.1 % at hydraulic loading rates 4.8, 9.6 and 19.2 m day-1 respectively. While, the TAN was decreased with increasing the hydraulic loading rates. The theoretical dissolved oxygen consumption (DOcon) were about 2.6, 4.3 and 3 mg l−1, representing 65%, 90% and 50% of the measured DO loss throughout the wetland at hydraulic loading rate 4.8, 9.6 and 19.2 m day-1 respectively. The results indicated that no noticeable difference between fish growth parameters observed under hydraulic loading rate for 9.6 m day-1 and control treatment.

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Main Subjects

References

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Misr Journal of Agricultural Engineering
Volume 34, Issue 1
January 2017
Pages 417-430

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