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Accueil du site → Master → Pays Bas → 2014 → Optimization of wastewater treatment plant using plant-wide modeling tool : Reysut WWTP Salalah - Oman : (case study)

UNESCO-IHE Institute for Water Education, Delft (2014)

Optimization of wastewater treatment plant using plant-wide modeling tool : Reysut WWTP Salalah - Oman : (case study)

Eidroos, A.

Titre : Optimization of wastewater treatment plant using plant-wide modeling tool : Reysut WWTP Salalah - Oman : (case study)

Auteur : Eidroos, A.

Etablissement de soutenance : UNESCO-IHE Institute for Water Education, Delft

Grade : Master of Science (MS) 2014

Résumé
This study was conducted to estimate the potential energy cost reduction of Reysut Wastewater Plant located in Oman based on the replacement of aerobic digester with anaerobic digester for biogas production and energy recovery through the application of a plant-wide modelling approach using Biowin simulator. STOWA protocol guidelines were used to develop RWWTP Wide-plant model. The Protocol included historical data collection and evaluation, sampling campaign, wastewater characterization and fractions, flow mass balance, model structure, model calibration, model validation and, model scenarios study. RWWTP was constructed in the year of 1998 and designed to treat only domestic wastewater for biological organic matter and nitrogen removal. RWWTP process system is operated with two streams for biological treatment process based on conventional activated sludge treatment followed by tertiary treatment units of sand filters and disinfection units of ozone and the chlorination. One year data was collected and evaluated followed up by an extensive sampling campaign for a period of 20 days. The results of data collection and sampling program analysis showed the RWWTP was performed well with regards of organic and nitrogen removal. However, the performance of primary settler tank was found to be very poor with only 17.89% removal efficiency of particulate COD. The results also showed that the two biological treatment streams were operating with different Sludge Retention Time (SRT). The SRT of stream one found to be 11 days whereas SRT of stream 2 found to be 30 days. Dissolved Oxygen (DO) of both streams found to be higher than normal standard rate of 2mg/l.The plan-wide model was structured and calibrated based on STOWA protocol calibration guidelines. The decay factor of autotrophic biomass, substrate (NH4) half saturation factor (KNH4), the anoxic hydrolysis factor (NO3) and anoxic NO3 half saturation factor (KNO3) parameters were calibrated in the case of RWWTP.The plant-wide model under steady state conditions was successfully implemented and validated to represent RWWTP performance. The optimal Scenario of energy cost reduction was replacement of aerobic digester with anaerobic digester, increasing primary clarifier removal efficiency to 60%, reducing SRT of stream 2 to 12 days and reducing DO concentrations for both aerations to 2 mg/l. The plant-wide model proved that the optimal scenario will reduce the energy cost by 42% of the current energy cost. The estimated energy cost reduction based on the optimal scenario was 70,038 R.O per year (140,076€ per year).

Sujets  : wastewater treatment plants ; anaerobic sludge ; optimization ; modelling ; case studies ; Oman

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