الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Simulations based on acti\ ateci sludge models are considered today as indispensable tools for understanding the process behavior and for the assessment of scenarios related to wastewater treatment plant desiun and operation. Regardless of the complexity of activated sludge models themselves, to adecluately simulate these models it is necessary to o ercome several other diiiculties related to \vastewater characterization, parameter calibration and the sle—specilic nature at treatment plants \vith respect to the simulated conliguration, node of operation and implemented control aspects. The present thesis aims to identif some m,’usures to flicilitate the development of a reliable process simulator based on a commonly used pre-denitri tication process contiguration and the specifications 01’ a realistic plant. kmrst a filet ature revie\\ on I WA’s .\SN I suite ol models is presented highlmghtine tl:.’n main di I ieiences and providing a brief description of the LA WAG lio-P module that incorporates l osphorus removal 10 nu)del ASM3. Following, the thesis thoroughly discusses a step-wise
procedure proposed br the development of the simulation program stressing the need for a rigid trainexs ark to guide the research. Important decisions made during development include choosing the C’( )S 1’ simulation benchmark configuration as the application case study and NI Al I ,Al as the i mplcnmentation soitware. Ibe reasons usti R ing these decisions are esplained alone \\ tim the o erull benchmark’s spccilicutions. Initial results of simulating in )del ASN 11 coupled to I akacs settler model are validated by the benchmark’s reference o 1pm under stead state and uncontrolled dynamic eather (di), storm and rain) scenarios Ilicn the d namic simulations are repeated under closed 1oop when two anti—\\ indup P1 controllers are activated. ‘l’he ci feet of P1 controllers on process variables is illustrated and iinulation results arc discussed. lu demonstrate the capahi Ii ty of l’akics settler model br simulating the sludge blanket in combination of activated sludge models, several settler profiles are presented and commented on. Then plant perbormance is assessed by a selection ol performance criteria when principal control variables (oxygen transfer rate, sludge recycle. mihrate internal ic—circulation and wastage flow rate ratios) are manipulated under all weathering conditions. Within the context of the COS’l’ benchmark, ASNI 1 only is implemented to model the biological part ol’ the system, the present thesis extends implementation to models ASM3 and ASNI2d. A simulation study ol’ models ASM3 and 2d coupled to lukics model is conducted on the same benchmark configuration. Simulation re,ults of model ASN1S under steady slate are compared to those obtained when ..\SNI I is used to detect (hilbercnces between both models. Pulse and step-type disturbances on influent