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The eco-efficiency assessment of wastewater treatment plants in the city of Mashhad using emergy and life cycle analyses
, Article Journal of Cleaner Production ; Volume 249 , 2020 ; Zafari koloukhi, H ; Rostami, F ; Rouhbakhsh, M ; Avami, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
The aim of this study is to evaluate the sustainability of two actual wastewater treatment plants using the eco-efficiency index based on emergy and life cycle analysis. The life cycle analysis is used for environmental investigation to estimate the eco-efficiency index. Moreover, the emergy theory indicating the input and output flows of the ecosystem are applied to assess the sustainability considering ecosystem services. Two treatment plants are studied in the city of Mashhad in Iran. The potential for sustainability improvement of plants is analyzed in some scenarios including the production of agricultural compost from sludge, 10% reduction of energy consumption, and 10% reduction of...
Effect of the ozonation pretreatment on biogas production from waste activated sludge of tehran wastewater treatment plant
, Article Biomass and Bioenergy ; Volume 152 , 2021 ; 09619534 (ISSN) ; Ghasemi, S ; Khosravi, A ; Vossoughi, M ; Sharif University of Technology
Elsevier Ltd
2021
Abstract
In this study, the ozonation impact on anaerobic digestion of wasted thickened activated sludge of Tehran wastewater treatment plant has been investigated. Regarding that, the thickened activated sludge, a final solid waste of treatment plants, was subjected to ozonation pretreatment to evaluate its characteristics. Three major sludge characteristics were considered for investigating ozonation effects on anaerobic digestion. A comparison of two different ozone doses, i.e., 0.05 and 0.1 gO3 g−1TS was performed for short-term (10 days) and long-term (30 days) sludge retention times. Furthermore, biogas production, sludge composition, dewaterability, and energy balancing, were studied during...
Techno-economic optimization of biogas-fueled micro gas turbine cogeneration systems in sewage treatment plant
, Article Energy Conversion and Management ; Volume 218 , 15 August , 2020 ; Avami, A ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
The aim of this paper is to investigate the feasibility of a combined cooling, heating, and power generation system with a micro turbine using biogas as the fuel to supply the heat and electricity demands in a real wastewater treatment plant. The plant is optimized using the system's total cost rate and the amount of the produced biogas as objective functions. The anaerobic digester is modeled using the ADM1 model. The optimization variables include digester hydraulic retention time, compressor pressure ratio, isentropic compressor efficiency, recuperator pinch time temperature, turbine isentropic efficiency, turbine input temperature, and the number of micro turbines. In the first scenario...