03369cas|a2200409 a 4500 20260818100054.0 031200s2000 th uu|m rtt 0| a1eng d .b11816983 AIT Thesis no.EV-00-1 Bunpot Sitanrassamee Enhanced energy production from and stabilization of solid pineapple waste by two-phase anaerobic digestion Bangkok : Asian Institute of Technology, 2000 84 leaves Thesis ; no. EV-00-1 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 2000 This study was carried out to evaluate and determine the suitable working conditions for enhancement of acids production with the stabilization of solid pineapple waste simultaneously when operating with two-phase anaerobic digestion. A batch study was conducted on the lab scale units using solid pineapple waste (peel) as feed. It was found that, to enhance acids production, the operation of a digester at neutral pH is effective. In a period of two weeks, volatile fatty acids, which mainly consisted of acetic and butyric acid, could be obtained at about 50 g/kg pineapple waste. Overall volatile solid reduction of74 - 80% was obtained with 51-57% of volume reduction. The potential energy that could be recovered was calculated based on volatile fatty acids generated from digestion. The energy about 800 kJ/kg of solid pineapple waste could be gained from two phase anaerobic digestion. Apart from the objectives of the study, the inhibition from unionized acids to the activity of acetogenic bacteria was observed. The threshold limit of unionized acids concentration for acidogenesis of 600 mg/L was set and used as a tool to describe phenomena, which occurred during the experiment. Based on the hypothesis that unionized acids are the inhibitory factors to bacteria, the combination of volatile fatty acids and pH should be considered to identify suitable conditions for acidogenesis and methanogenesis in anaerobic digestion process. Agricultural wastes as fuel Fukushi, Kensuke, Chairperson Chongrak Polprasert, Examination Committee Trankler, Josef, Examination Committee Her Majesty Queen's Scholarship, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-00-1 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B06897 .b11816983 mnait u 240401 0 991104 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120652572 CREATED : 1999-06-07 RECORD # : i12229180 LPATRON : 1021438 LCHKIN : 2014-03-05 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 13 TOT RENEW : 18 Barcode : 30050120652564 CREATED : 1999-06-07 RECORD # : i12229192 LPATRON : 1016948 LCHKIN : 2004-11-22 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 8 TOT RENEW : 7 Barcode : 30050160077359 CREATED : 2016-05-24 RECORD # : i12989137 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 38384 38384 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.EV-00-1 30050120652572 2026-08-18 10:00:54 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no.EV-00-1 30050120652564 2026-08-18 10:00:54 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-00-1 30050160077359 2026-08-18 10:00:54 2026-08-18 40