02436cas|a2200241 i 450000500170000000800410001703500150005810000200007324501180009326000520021130000100026349000270027350001070030050200580040752013840046565000510184970000330190070000450193370000420197871000500202081000590207085600650212920260819084530.0170399s1991    th  uzm rtt  00|  a1eng d  a.b107294461 aChen, Ann-cheng10aThermophilic treatment of high strength wastewater by modified Upflow Anaerobic Sludge Blanket reactor (U.A.S.B.)  aBangkok :bAsian Institute of Technology,c1991  a70 p.1 aThesis ;vno. EV-91-20  aA thesis submitted in partial fulfillment of the requirements for  the degree of Master of Engineering  aThesis (M.Eng.) - Asian Institute of Technology, 1991  aThis study was aimed to cultivate thermophilic organisms  which can perform optimally at 55°c, and to utilize their  increased reaction rate at increased temperature. A semi-pilot modified U.A.S.B. reactor were operated at  different organic loading of 2 to 24 Kg COD/m3.day corresponding  to H.R.T.:12o hr to 10 hr and using distillery wastewater as  feed substrate which was inherently at high temperature.  Investigations on gas production rate, biogas composition, COD  balance, sulfur balance, microbial and physico-chemical mechanism  of granular sludge formation were made. It was determined that organic loading up to 24 Kg  COD/m3.day could be handled with satisfactory efficiency. High  methane production rate was linearly increasing correspondingly  with increasing organic loading. Higher organic loading was  still imposed continuously, that is, maximum organic loading was  not obtained yet. It was found that limiting step of thermophilic U.A.S.B. reactor was propionate degradation. The interspecies hydrogen  transfer in the system was very important factor for process  performance. Based on COD balance, 68% of removal COD was  converted to methane gas. Also it was found that sulfate reducing  bacteria can not compete with methanogenic bacteria in the  system. Both Methanosarcina-like and Methanothrix-like  methanogens were coexisting in granular sludge.10aSewagexPurificationxActivated sludge process1 aHarada, Hideki,eChairperson1 aTran, Francis T.,eExamination Committee1 aVerink, Johan,eExamination Committee2 aChinese Taipei Government,eScholarship Donor2 aAsian Institute of Technology.tThesis ;vno. EV-91-20  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B17411