ارزیابی تولید بیوگاز از هضم بی هوازی حالت خشک لجن فاضلاب شهری

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه مهندسی بیوسیستم، دانشکده کشاورزی، دانشگاه تبریز. ایران

2 گروه مهندسی مکانیک بیوسیستم، دانشکده کشاورزی، دانشگاه فردوسی مشهد. مشهد

چکیده

چکیده
با توجه به افزایش مصرف سوخت­های فسیلی در جهان، همچنین افزایش قیمت و اثرات زیست محیطی آن­ها، امروزه نیاز و علاقه به جایگزینی آن­ها با منابع جدید و تجدیدپذیر انرژی زیاد شده است. یکی از منابع انرژی تجدیدپذیر بیوگاز است و هضم بی­هوازی یکی از روش­های تولید بیوگاز از مواد آلی است که روز به روز در حال گسترش می­باشد. یکی از تقسیم­بندی­های هضم بی­هوازی حالت مایع و حالت خشک است. برخی از مزایای هضم بی­هوازی حالت جامد شامل حجم کمتر مورد نیاز رآکتور، انرژی کمتر برای گرم­کردن و جابجایی راحت­تر است. در این پژوهش هضم بی­هوازی حالت جامد لجن فاضلاب شهری مورد مطالعه قرار گرفت. مطالعه در مقیاس آزمایشگاهی (حجم 1 لیتر)، دمای مزوفیلیک (37 درجه سانتی­گراد) و سهم مواد جامد 20­% انجام گرفت. نتایج ارزیابی خصوصیات لجن فاضلاب شهری نشان داد این مواد از پتانسیل خوبی برای تولید بیوگاز از هضم بی­هوازی حالت جامد برخوردارند (سهم مواد جامد کل 7/25­%، سهم مواد جامد فرار 7/50­% و نسبت کربن به­ازت 7/11). هم­چنین نتایج حاصل از هضم بی­هوازی نشان داد مقدار 362 میلی­لیتر بیوگاز به­ازای هر گرم مواد جامد فرار در شرایط نرمال آزمایشگاهی به­دست آمد. از این میزان 213 میلی­لیتر متان حاصل شد که معادل 8/58­% است. هم­چنین میزان درصد کاهش مواد جامد فرار که یکی از پارامترهای بهره­وری آزمایش است 7/63­% به­دست آمد.

کلیدواژه‌ها


عنوان مقاله [English]

Evaluation of Biogas Production from Solid State Anaerobic Digestion of Municipal Sewage Sludge

نویسندگان [English]

  • Mohsen Saghouri 1
  • Reza Abdi 1
  • Mohammad Ali Ebrahimi nik 2
  • Abbas Rohani 2
  • Mohammad Ali Maysami 1
1 Department of Biosystems Engineering, Faculty of Agriculture, University of Tabriz, Tabriz, Iran
2 Department of Biosystems Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
چکیده [English]

Abstract
Due to the increasing consumption of fossil fuels in the world as well as their increasing cost and environmental impacts, the great need and interest to replace them with renewable energy resources has increased. Anaerobic digestion is a biochemical process that is able to convert almost all kinds of multi-dimensional biodegradable organic matters under anaerobic conditions to biogas. According to water content, anaerobic digestion methods are classified as wet and solid state. The solid-state anaerobic digestion has been claimed to be advantageous over liquid AD for a number of reasons including smaller reactor volume, lower energy requirements for heating and minimal material handling. In this paper, biogas production from solid state anaerobic digestion of municipal sewage sludge was studied. A series of single-stage batch mesophilic (37 ± 1oC) anaerobic digestions were performed at a total solids concentration of 20% in 1 liter reactor volume. The evaluation of municipal sewage sludge characteristics showed that this substrate has a good potential for solid state anaerobic digestion (Total solids, volatile solids and C/N ratio were obtained 25.7%, 50.7% and 11.7, respectively). The biogas yield was achieved 362 ml/g VS, which methane content of biogas was 213 ml (58.8%). The volatile solids reduction, a significant parameter to measure productivity of anaerobic digestion, was obtained to be 63.7%.
 
 

کلیدواژه‌ها [English]

  • Keywords: Renewable Energies
  • Biogas
  • Municipal Sewage Sludge
  • Solid State Anaerobic Digestion
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