Abstract    The purpose of the research was to study the effect of microwave power inpretreatment of fresh waterhyacinth on biogas production. The variations of microwave power levels are 240; 400; 560 and 800 W. The variations of microwave heating time are 5; 7 and 9 min. The unpretreated fresh water hyacinth are used as control. The result of research showed that the microwave pretreatment of fresh water hyacinth improved biogas production. Microwave pretreatment had a positive impact on anaerobic biodegradability of fresh waterhyacinth.Almost all pretreatedfresh water hyacinthproduced biogas were higher compare tounpretreated fresh water hyacinth.The maximum of biogas production from freshwater hyacinth was obtained at 560 W for 7 of microwave pretreatment. In this condition, pretreated fresh water hyacinthresulted biogas production of 75,125 mL/g TS.The unpretreated fresh water hyacinth produced biogas of 37,5625 mL/g TS. The highest value of kinetic constants of biogas yield potential (A), the maximum biogas production rate (U) and the duration of lag phase were78.2300 mL/g TS; 2.2653 mL/(g TS.day); 4.6031 day, recpectively.

Keywords    water hyacinth, microwave pretreatment, biogas production

چکیده    هدف از این پژوهش، بررسی اثر قدرت مایکروویو در پیشتیمار گل سنبل آب شیرین در تولید بیوگاز بود. تغییرات سطح قدرت مایکروویو 240، 400، 560 و 800 وات بودند. تغییرات زمان حرارت مایکروویو 5، 7 و 9 دقیقه بود. سنبل آب شیرین پیشتیمار نشده به عنوان شاهد استفاده شد. نتایج تحقیق نشان داد که تولید بیوگاز از سنبل تازه پیشتیمار شده در مایکروویو بهبود یافت. پیشتیمار مایکروویو، تاثیر مثبتی بر زیست تخریب پذیری بی هوازی سنبل آب شیرین داشت. حداکثر تولید بیوگاز از سنبل آب شیرین پیشتیمار شده در مایکروویو در 560 وات به مدت 7 دقیقه به دست آمد. در این شرایط، سنبل آب شیرین پیشتیمار شده به میزان 12/75 میلی لیتر بیوگاز به ازای هر گرم از جامد کل تولید کرد. در حالی که سنبل آب شیرین پیشتیمار نشده 56/37 میلی لیتر بیوگاز به ازای هر گرم از جامد کل تولید کرد. بیشترین مقدار ثوابت سینتیکی تولید بیوگاز از جمله بازده بیوگاز، ماکزیمم نرخ تولید بیوگاز و مدت زمان فاز تاخیر به ترتیب 23/78 میلی لیتر بیوگاز به ازای هر گرم از جامد، 26/2 میلی لیتر بیوگاز به ازای هر گرم از جامد در هر روز و 60/4 روز به دست آمد.

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