03633cas|a2200397 i 4500 20260818095336.0 230399s1993 th uzm rtt 00| a1eng d .b10231924 AIT Thesis no.EV-93-36 Ganguly, Sudip K. Effects of the pretreatment of biological sludge on anaerobic digestion Bangkok : Asian Institute of Technology, 1993 122 leaves + 1 online resource Thesis ; no. EV-93-36 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1993 This research was done in three separate phases followed by statistical analysis. In the first phase, WAS was thermochemically pretreated to determine conditions for optimum solubilization and biodegradability. The optimal dosage of Na OH turned out to be in the range of 0.4 to 0.5 gNaOH /gVSS and 0.2 to 0.4 gNaOH /gVSS for solubilization and methanogenesis respectively. In the second phase of the experiments, investigations related to the inhibitory effects were carried out using thermal and thermochemical pretreatment at 115°C, l hr. contact time, and 0.24 gNaOH /gVSS alkali dosage. Reduced methane conversion (20 to 35%) was observed at and beyond FCOD/MVSSseed = 0.4 both in the case of thermal and thermochemically pretreated WAS. Finally, in the third phase Hen Egg Albumin was used to see if, the observed effects of WAS could be explained from the behaviour of its simpler constituents under identical pretreatment conditions. Results indicated very high biodegradability (85 % ) of the protein used. Inhibitory effects on methane conversion were observed both in the case of thermal (12 to 33%) and thermochemical (18 to 33%) with respect to the control possibly, due to formation of nonbiodegradable substances at a high pretreatment temperature (115°C) and also due to the presence of alkali dosage (0.24gNaOH /gVSS) leading to effects observed in the case of WAS. Statistical analysis confirmed the experimental findings. Contributory effects due to. FCOD/MVSSseed, Pretreatment Conditions and Time (days) on methanogenic activity were evaluated using The Three way ANOV A Technique at three levels of Significance (0.01, 0.04, and 0.001). Analysis revealed appreciably high reliability of data obtained especially in the case of WAS. The quantitative trends evaluated using the concept of pure effects due to each of the above explanatory variable supported the experimental findings. Sewage Purification Activated sludge process Fujii, Shigeo, Chairperson Samorn Muttamara, Examination Committee Umita, Teruyuki, Examination committee Tanaka, Shuzo, Examination committee Government of Japan, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-93-36 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16688 .b10231924 mnait x 240329 2 951012 m a x 0 mnait mnarc 22 40 Barcode : 30050120124515 CREATED : 2014-03-28 RECORD # : i12781599 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160055629 CREATED : 2016-11-05 RECORD # : i1297528x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 35421 35421 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-93-36 30050120124515 2026-08-18 09:53:36 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-93-36 30050160055629 2026-08-18 09:53:36 2026-08-18 40