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University of Bath (1993)

Modelling nitrification in the River Zarka of Jordan

Abumoghli, Iyad

Titre : Modelling nitrification in the River Zarka of Jordan

Auteur : Abumoghli, Iyad.

Université de soutenance : University of Bath

Grade : Doctor of Philosophy (Ph.D.) : 1993

Résumé
A novel approach to a one-dimensional river water quality model is represented in this study. The Zarka model described uses data collected on the River Zarka of Jordan. The river is highly polluted and can be considered to represent semi-treated wastewater effluent, as the prime source is a large waste stabilization treatment plant. The river is characterised by its shallow fast flowing nature, with high loadings of organics and inorganics, along with high bacterial and algal biomass. Conditions of high solar radiation intensities and toxicity inhibited complete nitrification. The Zarka model focuses on the nitrification process as ammonium concentrations reach l00mg/1 at the river’s source and nitrate concentrations approach 120mg/l at the river’s mouth. The model combines the two important factors affecting nitrification, namely algal and bacterial activity. Algal activity is represented in the model by the ratio of maximum to minimum oxygen produced in a diurnal cycle rather than its biomass reflected by chlorophyll concentration. The latter proved to be misleading in the River Zarka due to photoinhibition which reduced algal activity but did not significantly affect algal biomass (as regarded by chlorophyll content). The river is highly responsive to environmental changes, as it is a shallow stream flowing in a semi-arid region. Therefore, as temperature may drop or increase by 10 degrees in a daily cycle, the model is used to predict changes in nitrification within a range of (5-30C). Finally, the Zarka model is used to predict the water quality of the river by adopting two hypothetical cases to improve its water quality. These two cases illustrate that although the river water quality would improve by changing some factors, the prime factor affecting the river water quality is the performance of the treatment plant which is the main continuous source of the Zarka.

Mots Clés : Water pollution & oil pollution Water Pollution Water Pollution Sewage Hydrology Water — Pollution Hydrology

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