Microwave Pretreatment of Fresh Water Hyacinth (Eichhornia crassipes) in Batch Anaerobic Digestion Tank

The purpose of this research was to study the effect of microwave power in pretreatment of fresh water hyacinth on biogas production. The variations of microwave power levels were 240; 400; 560 and 800Watt (W). The variations of microwave heating time were 5; 7; and 9 min. The unpretreated freshwater hyacinth was used as control. The research results showed that the microwave pretreatment of fresh water hyacinth improved biogas production. Microwave pretreatment had a positive impact onanaerobic biodegradability of fresh water hyacinth. Almost all pretreated fresh water hyacinthproduced biogas more than unpretreated fresh water hyacinth. The maximum biogas production from fresh water hyacinth was obtained at 560 W for 7 min of microwave pretreatment. At this condition, pretreated fresh water hyacinth produced 75.12 mililiter biogas per gram of Total Solid (mL/g-TS).The unpretreated fresh water hyacinth produced 37.56 mL biogas /(g-TS). The highest value of biogas production kinetic constants including biogas yield potential (A), the maximum biogas production rate (U) and the duration of lag phase (λ) were 78.23 mL/(g-TS); 2.26 mL/(g-TS.day); 4.60 days, recpectively.

کلیدواژه ها:

Water Hyacinth ، Microwave Pretreatment ، Biogas Production