ارزیابی اقتصادی پتانسیل استحصال انرژی از فاضلاب شهری: مورد مطالعه خرم‏آباد

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه انرژی‏های نو و محیط‏ زیست، دانشکدۀ علوم و فنون نوین، دانشگاه تهران

2 دانشجوی کارشناسی ارشد، دانشکدۀ مهندسی انرژی، دانشگاه صنعتی شریف

3 دانشیار گروه انرژی‏های نو و محیط ‏زیست، دانشکدۀ علوم و فنون نوین، دانشگاه تهران

10.22059/ses.2023.344878.1011

چکیده

توسعۀ اقتصادی جهانی مستلزم افزایش تقاضا برای استفاده از آب به ‏منظور اهداف مختلف است. تصفیۀ فاضلاب در این فرایندها منجر به افزایش حجم لجن فاضلاب می‏شود. با این‏حال، مقدار قابل ‏توجهی از انرژی تجدیدپذیر را می‏توان از لجن حاصل از تصفیۀ فاضلاب بازیابی کرد. زیست‏توده، از جمله منابع انرژی است که پتانسیل جایگزینی مداوم برای سوخت‏های فسیلی را دارد که بخش قابل ‏توجهی از آن از فاضلاب‏های شهری و صنعتی تشکیل می‏شود. هضم بی‏هوازی به‏عنوان یک استراتژی برای تولید انرژی و بیوگاز، از زباله و فاضلاب شهری به کار می‏رود. در این مطالعه پتانسیل استحصال انرژی از فاضلاب تصفیه‏خانه‏های شهرستان خرم‏آباد با استفاده از داده‏های اولیه (شامل BOD) در مورد عملکرد تصفیة فاضلاب طی یک دورة یک‏ساله (1400) بررسی و ارزیابی شده است. نتایج نشان می‏دهد به طور سالیانه با استفاده از روش هضم بی‏هوازی می‏توان 2261728 مترمکعب بیوگاز تولید کرد. با استفاده از سیستم تولید هم‏زمان برق و حرارت می‏توان 24879008 مگاوات انرژی حرارتی و 476.34 کیلووات‏ساعت انرژی الکتریکی تولید کرد. همچنین، ارزیابی اقتصادی سیستم نشان می‏دهد هزینه‏های سالانه سرمایه‏گذاری و هزینه‏ های عملیاتی به‌ترتیب 103251697000 و 14620633 ریال خواهد بود. در مقابل تصفیه‏خانه قادر است تا با صرفه‏جویی مصرف گاز طبیعی، فروش کود تولید شده و فروش برق تولیدی به شبکه به طور سالیانه 44689938600 ریال درآمد کسب کند. نرخ بازگشت سرمایۀ اقتصادی برای اجرای این طرح 3 سال و 6 ماه محاسبه شده است. اجرای این طرح علاوه بر توجیه‏پذیری اقتصادی قادر خواهد بود تا از انتشارت گازهای گلخانه‏ای به طور قابل ‏توجهی جلوگیری کند.

کلیدواژه‌ها

عنوان مقاله [English]

Economic Evaluation of Energy Production Potential from Municipal Wastewater: Case Study Khorramabad City

نویسندگان [English]

  • Zahra Zolfaghari 1
  • Sina Kazzazi 2
  • Ahmad Hajinezhad 3
1 Master Student, Department of Renewable Energies and Environment, Faculty of New Sciences and Technologies, University of Tehran, Iran
2 Master Student, Department of Energy Engineering, Sharif University of Technology, Tehran, Iran
3 Associate Professor, Department of Renewable Energies and Environment, Faculty of New Sciences and Technologies, University of Tehran, Iran
چکیده [English]

Global economic development requires increasing water demand for various purposes. Wastewater treatment in these processes leads to an increase in the volume of sewage sludge. However, a significant amount of renewable energy can be recovered from sludge from wastewater treatment. Biomass is one of the energy sources that has the potential of sustainable replacement for fossil fuels, a significant part of which consists of municipal and industrial wastewater. Anaerobic digestion is used as a strategy to generate energy and biogas from municipal waste and sewage. In this study, the energy production potential of wastewater treatment plants in Khorramabad city has been investigated and evaluated using preliminary data (including BOD) on wastewater treatment performance over one year (2021). The results show that annually 2261728 cubic meters of biogas can be produced using the anaerobic digestion method. Using the combined heat and power system can generate 24879008 MW of thermal energy and 476.34 kWh of electricity. Also, the economic evaluation of the system shows that the annual investment costs and operating costs will be 103251697000 and 14620633 Rials, respectively. On the other hand, the refinery can save 44689938600 Rials annually by saving natural gas consumption, selling fertilizer produced, and selling electricity generated to the network. The rate of return on economic capital for implementing this plan is calculated for 3 years and 6 months. In addition to economic justification, implementing this plan will be able to prevent greenhouse gas emissions significantly.

کلیدواژه‌ها [English]

  • Anaerobic Digestion
  • Biogas
  • Municipal Wastewater
  • Sustainable Energy Development
  • Waste Management

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فصلنامه سیستم های انرژی پایدار
دوره 1، شماره 3
تیر 1401
صفحه 251-263

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