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بررسی اثر پیش تصفیه قلیایی بر بهبود شرایط تولید بیومتان از هضم بی هوازی مخلوط پسماند جامد شهری و لجن فاضلاب

نوع مقاله : مقالات پژوهشی

نویسندگان

1 گروه مهندسی بیوسیستم، دانشگاه محقق اردبیلی، اردبیل، ایران

2 گروه مهندسی بیوسیستم دانشگاه محقق اردبیلی

چکیده

چکیده
زمینه و هدف: با افزایش مصرف انرژی، بحران انرژی در جهان پدید آمده است. سوخت­های فسیلی، منابعی محدود و رو به پایان است. بیوگاز سوختی است که امروزه بسیار مورد توجه محققان قرار دارد. جهت افزایش تولید بیوگاز، روش­های پیش­تصفیه مختلفی مورد استفاده قرار گرفته است. بنابراین مطالعه حاضر با هدف بررسی تأثیر نسبت‌های اختلاط پسماند شهری و لجن فاضلاب و بررسی تأثیر غلظت­های مختلف پیش‌تصفیه قلیایی بر تخریب­پذیری پسماند و تولید بیومتان انجام شد.
مواد و روش­ها: این مطالعه در مقیاس آزمایشگاهی در هاضم­هایی به حجم 1 لیتر و در دمای 37 درجه سانتی­گراد با غلظت­های مختلف سود در قالب طرح کاملاً تصادفی انجام شد. حجم بیوگاز و pH به‌صورت روزانه اندازه­گیری شد. جامدات کل، جامدات فرار، درصد کربن و نیتروژن مواد اولیه بر اساس استاندارد APHA  (موسسه انتشارات سلامت امریکا) اندازه­گیری شدند.
یافته‌ها: اولین گام در نتایج تعیین نسبت اختلاط بهینه پسماند و لجن فاضلاب بود که بیشترین عملکرد بیومتان در نسبت 60:40 به میزان 87/254 میلی­لیتر به ازای هر گرم ماده فرار تولید شد. در گام دوم آزمایش، اثر غلظت‌های­ 2، 6 و 10 درصد سود در میزان گاز تولیدی ارزیابی شد که غلظت 6% سود، به‌طور قابل­توجهی تجزیه پسماند آلی را بهبود بخشید. بیومتان تولیدی، حذف ماده فرار و جامد هاضم در مقایسه با نمونه شاهد، به‌ترتیب 30%، 94/27% و 25/27% افزایش نشان داد.
نتیجه­گیری: نسبت اختلاط پسماند و لجن فاضلاب 60:40 و پیش‌تصفیه با سود 6%، باعث بهبود تجزیه پسماند آلی شده و در نتیجه تولید بیومتان افزایش می­یابد.
نوع مقاله: پژوهشی
کلیدواژه­ها: بیوگاز، پسماند شهری، پیش­تصفیه قلیایی، لجن فاضلاب، هضم بی‌هوازی
 

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation the effect of alkaline pretreatment on improvement of biomethane production from anaerobic digestion mixed municipal waste and sewage sludge

نویسندگان [English]

  • Mansour Ahmadi Pirlou 1
  • Tarahom Mesri Gundoshmian 2

1 Department of Biosystems Engineering, University of Mohaghegh Ardabili, Ardabil, Iran.

2 Biosystems engineering Dep. University of Mohaghegh Ardabili

چکیده [English]

Abstract
Background and Aim: Increasing energy consumption has created an energy crisis in the world. Fossil fuels are limited and depleting. Biogas is considered a fuel that has attracted the attention of researchers. To increase biogas production, different pretreatments have been utilized. The purpose of this study was to investigate the optimal mixing ratio of Municipal Solid Waste (MSW) and Sewage Sludge (SS), as well as the effects of various conditions of alkaline pretreatment on biodegradability of wastes and the amount of biomethane production.
Materials and Methods: This study was done in a laboratory digester with 1 L volume at 37 °C with different concentrations of NaOH in a completely randomized design. Biogas volume, methane volume, and changes in pH were measured daily. Measurement parameters in the anaerobic digestion including total solids, volatile solids, and carbon and nitrogen content in the feedstock were determined according to the APHA standard methods.
Results: The optimal mixing ratio of MSW to SS was 60:40 with the highest methane yield of 254.87 mL/g VS. Next, the effects of 2, 6, and 10% NaOH concentrations were evaluated on the amount of gas produced, indicating that 6% NaOH concentration significantly improved waste decomposition. Methane production, VS, and TS removal were compared to the control treatment, and there were increases of 30, 27.94, and 27.25%, respectively.
Conclusion:The results showed that the mixing ratio of MSW to SS at 60:40 with 6% NaOH improves the decomposition of organic wastes and increases biomethane production.
Keywords: Alkaline Pretreatment; Anaerobic Digestion; Biogas; Municipal Solid Waste; Sewage Sludge

 
 
 

کلیدواژه‌ها [English]

  • Alkaline pre-treatment
  • Anaerobic Digestion
  • Biogas
  • Municipal Solid Waste
  • Sewage Sludge
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مجله پژوهش در بهداشت محیط
دوره 7، شماره 1
تیر 1400
صفحه 53-66
فایل ها
هم رسانی
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