|M.Sc Student||Rana Haick|
|Subject||Treatment of Nitrogen Compounds in|
|Department||Department of Civil and Environmental Engineering||Supervisor||Professor Emeritus Galil Noah (Deceased)|
|Full Thesis text|
The current thesis aims to establish a protocol for a biological treatment process that is fed with influents having different ratios of "organic compounds : nitrogen : phosphorous", compared to domestic wastewater. To determine the necessary and/or optimal parameters needed for operational design, the current thesis has focused on a system that includes three parts that are connected in series: an anoxic reactor, an aerobic reactor, and a clarifier. Several mass balances were applied for each part of the system as well as on the system as a whole. The mass balances were applied on the organic material, on the solid materials, and on the nitrogen-based materials while applying several justifiable assumptions. The main outcome of these calculations have revealed the following: (i) The higher is the total Kjeldahl nitrogen in the petrochemical wastewater the longer is the required retention time in the anoxic reactor; (ii) The total Kjeldahl nitrogen concentration in the petrochemical wastewater does not affect the retention time in the aerobic reactor; (iii) The optimal ratio between the biological oxygen demand and the total Kjeldahl nitrogen is 8:1; (iv) There is a linear and proportional relationship between the retention time in the aerobic reactor and biological oxygen demand concentration; (v) A different specific denitrification rate does not affect the retention time in the aerobic reactor. (vi) The higher is the specific denitrification rate the shorter is the retention time in the anoxic reactor; (vii) The “net oxygen required” exhibits linear relationship with flow rate of the wastewater at constant temperature, biological oxygen demand, and total Kjeldahl nitrogen; (viii) Increasing the temperature in the range of 5-30 °C decreases the “net oxygen required” while increasing the temperature beyond this range increases the “net oxygen required”; (ix) The higher is the biological oxygen demand the higher net oxygen required in the process; (x) The effect of total Kjeldahl nitrogen concentration on the “net oxygen required” is rather small; and (ix) In the chemical treatment, Alum shall be added to the wastewater to react with the phosphorous compounds and the resulted complex is then moved by physical processes. The obtained results shall provide a basis for state-of-the-art protocol that could aid designers to achieve cost-effective designs, while saving time and cost during the design process.