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035 _a.b10192621
099 9 _aAIT Thesis no. 1404
100 0 _aPitak Kreatidadpanya
245 1 0 _aDesign parameters for biogas production in tropical rural villages
260 _aBangkok :
_bAsian Institute of Technology,
_c1978
300 _a91 p.
490 1 _aThesis ;
_vno. 1404
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering of the Asian Institute of Technology, Bangkok, Thailand
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1978
520 _aThe purpose of this study was to investigate the optimum design parameters for biogas production in tropical rural villages using fixed cover type digesters which is similar to the Chinese system. Pig and poultry manures at different ratios of mixture were employed as raw materials fed to the digesters. For the batch biogas experiments (3 units) with varying pig : poultry ratios of 6.5 : 3.5, 5.0 : 5.0, 3.5 : 6.5, it was found that the highest gas production was obtained with the first ratio for a detention period of 20 days. With continuous feeding at different detention times of 20, 30 and 40 days, the following design parameters were observed to yield the most satisfactory results : Pig : Poultry ratio = 6.5 : 3.5, loading rate= 2 Kg VS/m3-day, detention time= 20 days, gas yield = 0.32 liter/g VS-day for a methane content of 71% and COD removal efficiency = 61%. Further experiments of these loading parameters with the pilot scale biogas units yielded similar results to that of the laboratory scale study. However, diurnal fluctuation in temperature was found to significantly affect the digester performance in term of gas production, but the mixed liquor pH in all digesters was within favorable range, i.e. 6.1-7.5. The red11ction of nitrogen and phosphorus after the study in batch digestion were 11% and 29%, respectively. This type of the biogas digesters was found to be relatively economic and easy in operation and maintenance.
650 0 _aManure gases
700 0 _aChongrak Polprasert,
_eChairperson
700 0 _aSamorn Muttamara,
_eCo-Chairperson
700 1 _aLohani, Bindu N.,
_eExamination Committee
710 2 _aCanadian Government,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. 1404
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B23102
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