الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 121 |  |  |
| | | from | 121 | | |
Abstract
Mathematical models and simulation are a useful tool for predicting wastewater treatment plant performance (WWTPs). Because the conceptual design is complex and ill-defined, these techniques are becoming increasingly used for improving wastewater treatment plant design. In this research, four alternatives: 1) complete-mix activated sludge without nitrogen removal (CMAS); 2) complete-mix activated sludge with nitrogen removal (CMAS-N); 3) immerged membrane bioreactor with nitrogen removal (MBR-N); and 4) complete-mix aerated lagoon (A-Lagoon) were designed into two steps: the first is the design concept to calculate the volume of processing units, and the second is to implement modeling and simulation to improve the accuracy of the conceptual design. The activated sludge model No. 1 (ASM1) in GPS X (v.8) simulation software was used to verify the treatment process design. This program helps in anticipate the potential efficiency of the treatment plant and sizing of treatment units. At the same time, it can calculate and measure the greenhouse gas emissions (GHG), which emitted to atmosphere from plant units’ treatment. In this research, Aqaba WWTPs was selected as a case study. Also, a cost estimation of the four alternatives was calculated using CapdetWorks (v.4) program simulation to conduct an economic comparison of the selected alternatives. The resulting values from both hand calculations and the program’s outputs were found to be in good agreement. The obtained results revealed that the significant difference in the volume of secondary treatment was obtained from design calculations, where the CMAS without denitrification system was 27,808 m3 (aerobic and secondary tanks), CMAS with denitrification system was 42,288 m3 (anoxic, aerobic, and secondary tanks), for MBR system was 14,697 m 3 (anoxic, aerobic and immerged membrane tanks), and 562,400 m3 for A-Lagoon (aerated lagoons and sedimentation ponds). A significance difference in effluent concentration -results was obtained from GPS-X program. MBR-N system achieved the highest removal efficiency of organic matter and total nitrogen concentrations, also it recorded the highest total carbon emission comparing to other alternatives treatment. Results also show that for the specified set of parameters and over a period of 39 years, CapdetWorks (v.4) evaluates the total Project Cost of the A-Lagoon plant at $32,300,000 less expensive than CMAS plant at $40,300,000, the CMAS-N plant at $58,600,000 and MBR plant at $106,000,000. The used simulation program is a useful tool that can be used to anticipate the most appropriate treatment and gas emissions.