Celestino Ladu, J.,L, Loboka, M. K. And Lukaw,Y.S.

Abstract

This research paper tried to assess the efficiency of integrated constructed wetland in eliminating Nitrogen from domestic sewage of Soba rural area in Khartoum South, Sudan. The integrated constructed wetland is about 8.89 acres and consists of two sludge puddle and five shallow vegetated wetland units. The assessment of this study was base on influent and effluent concentrations of ammonia – nitrogen (NH3), nitrate-nitrogen (NO3-N) and wetland hydrology. The influent sewage classically contained 40 mg L-1 NH3-N and 5 mg L-1 NO3-N. The average concentration of Nitrogen in the integrated constructed wetland effluent was less than 1.0 mg L-1 for both forms. Generally, a total load of 2802 kg NH3-N and 441 kg NO3-N was received by the integrated constructed wetland and an elimination rate of 98.0 % and 96.9 % respectively. Average a real N loading rate (245 mg m-2 d-1 NH3-N and 38 mg m-2 d-1 NO3-N) had a significant linear relationship with a real N elimination rate (240 mg m-2 d-1 and 35 mg m-2 d-1, correspondingly) for both forms. The a real first-order N elimination rate constants in the integrated constructed wetland averaged 14 m yr-1 for NH3-N and 11 m yr-1 for NO3-N respectively. Temperature coefficients (θ) for N lessening in the integrated constructed wetland was low and recommended that the variability in N elimination by the integrated constructed wetland was temperature independent.

Keywords: integrated constructed wetland; domestic wastewater, Nitrogen, sludge puddle; Wetland hydrology.