Modeling wastewater treatment process in Zenin WWTP with focus on energy consumption and treatment performance Karim.M. Aboelghait1 , Ahmed S. G. Khalil2, Rami Ghannam3, Thorsten Mietzel 4, André Niemann5 1: National Research Center, Egypt 2: Faculty of Science, Fayoum University, Egypt 3: Egypt Nanotechnology Research Center 4: Department of urban water and waste management, University of Duisburg- Essen, Germany 5: Institute of Hydraulic Engineering and Water Resource Management, University of Duisburg- Essen, Germany Introduction Wastewater treatment plants (WWTPs) are large energy consuming facilities. It has been reported that they use 4% of the nation's electricity (Andrew et al., 2013). Egypt has more than 200 WWTPs with a capacity of 11million m3/day, serving approximately 18 million capita. This number has been increased 10 times within the last 20 years (Mahmoud, S. et al., 2012). Zenin WWTP is located in Giza, west of Cairo. It has a treatment capacity of about 400,000 m3 /day and purifies wastewater for 1.2 Million PE. The plant uses the activated sludge process as a main technique for wastewater treatment. SIMBA is a software program used in WWTPs for modeling and simulation of the different treatment processes (Erbe et al., 2002). For the modeling of treatment performance and evaluation of energy consumption ASM1 is applied (IWA, 2003) at Zenin plant. Options for the improvement of the energy consumption efficiency are discussed. Material and Methods SIMBA is a simulation software work during Matlab™ & Simulink™. Zenin WWTP was divided to 3 scenarios: Scenario1: recent running conditions in Zenin plant ( 4×104 m3 air/day) Scenario2: use of compressed air control with 1.8 mg O2 /l Scenario3:use of compressed air control with 1.5 mg O2 /l Wastewater Fig1:Main blocks for model the different treatment processes in Zenin WWTP By SIMBA (Scenario 1) 1- Raw wastewater 5- Primary settling 9- Effluent Fig 2:Main blocks for model the different treatment processes in Zenin WWTP By SIMBA (Scenario 2,3) Compressed air 2-Bar screening 6- Aeration tanks S sludge 3- Grit Removal 7- Secondary settling 4- Primary Aeration 8- Chlorination Fig 3:schematice of Zenin plant Results and Discussion Treated water quality in Scenarios 1,2and 3 The simba model for Zenin WWTP is run for 5 days and samples are analyzed every one hour. Fig 4 and Fig 5 show results for COD removal, TKN and NH4 for scenario 1. Fig 6 and Fig 7 show the results for COD removal, TKN and NH4 for scenario 1, 2,3 Compressed air Consumption in scenarios 1,2 and 3 Fig 8 indicate the daily change in raw water quality and Fig 9 show the air consumption. In Scenario 2 compressed air consumption was reduced by about 27% and in Scenario 3 with 32%. Raw Water Quality &Quantity Variation Zenin Plant 800 35000 700 30000 600 500 Value mg/l COD BOD TSS 20000 400 15000 300 Quantity Quantity m3 25000 10000 200 5000 100 0 0 12:00 2:00 AM 4:00 AM 6:00 AM 8:00 AM 10:00 AM AM 12:00 PM 2:00 PM 4:00 PM 6:00 PM 8:00 PM 10:00 PM Time (Cairo) Fig 4 : Total COD and Particulate COD (CODx) Scenario 1 Fig 5 : TKN and NH4 Scenario 1 Fig 6:: Total COD and Particulate COD (CODx) Scenario 2,3 Fig 8:Variation in water quality and quantity during the day Fig 7 : TKN and NH4 Scenario 2,3 Fig 9: Comparison between air consumption in Scenarios 1,2 and 3 Conclusions and Outlook The results of the modeling of zenin WWTP by SIMBA software program was suffient as no significant difference between obtained results and the real data in the plant occured. The results show that it is possible to use controlling in compressed air during the day according to wastewater quantity and quality which will reduce the compressed air consumption by 27 % up to 32 % . Consequently energy consumption is reduced. Effluent water quality is similar in scenario 2 and decreases slightly in scenario 3, but is still in the accebtable range (ECP 501/2005). References Acknowledgements 1-Andrew, K; Yaohui, Z; Zijun, Z.(2013). Modeling and analysis of pumps in a wastewater treatment plant: A data-mining approach. Engineering Applications of Artificial Intelligence ,26:1643–1651 2- Mahmoud S. Nasr, Medhat A.E. Moustafa, Hamdy A.E. Seif, Galal El Kobrosy.(2011)Modelling and simulation of German BIOGEST/EL-AGAMY wastewater treatment plants – Egypt using GPS-X simulator. Alexandria Engineering Journal :50, 351–357 3-Methods for Wastewater Characterization in Activated Sludge Modeling Henryk Melcer IWA Publishing, 2003 4 - Egyptian Code of Practice ECP 501/2005 for Wastewater Reuse in Agriculture 5-Erbe,V ; L.P. Risholt, L.P; Schilling ,W; Londong ,J .(2002). Integrated modelling for analysis and optimisation of wastewater systems – the Odenthal case. Urban Water ;4 : 63–71 Contact: Karim Mohamed Aboelghait, National Research Center, Dokki ,Giza I wish to express my thanks to Officials in Zenin WWTP for their help to collect data about the plant. I would like also to express my thanks to Timo Wortberg, Viktoria Berger and Rodolfo Alvarado Montero (University of Duisburg-Essen) and Tito Gehring (RuhrUniversity Bochum) due to their support in my work. email: [email protected] Funded by: www.uni-due.de/zwu/iwatec