03670nas|a2200397 a 4500 20260817161801.0 071112s2007 th uu|m rtt 0| a1eng d .b11890940 AIT Thesis no.EV-07-25 Monruedee Moonkhum Aerobic digestion of waste activated sludge with ultrasonic pretreatment Pathum Thani, Thailand : Asian Institute of Technology, 2007 77 leaves : ill. Thesis ; no. EV-07-25 Thesis (M.Sc.) - Asian Institute of Technology, 2007 Ultrasound pretreatment is very attractive option to enhance the digestion efficiency of waste activated sludge (WAS). It is gaining popularity because of its ability to breakdown the recalcitrant particles, compact design and no additional chemical requirement. The efficiency of the aerobic digestion of waste activated sludge containing 3% TS using ultrasonic pretreatment was determined at 2 different SRT of 10 and 20 days. WAS was sonicated for 150s with the ultrasonic density of 1.9 W/mL, at the frequency of 20 kHz and specific energy input of 9.5 kJ/kg TS. The ultrasonic pretreatment achieved the subsequent aerobic digestibility resulting better removal of Dissolved organic carbon (DOC). The DOC removal efficiency of part stream and full stream reactor improved by 26% and 28% respectively, at 10 days SRT compared to control reactor. Similarly, at 20 days SRT the efficiency of DOC removal of part stream and full stream reactor enhanced to 20% and 23% respectively, compared to control reactor. Correspondingly, VS removal of part stream and full stream reactor were found enhanced to 46% and 50% respectively at 10 days SRT in comparison to control reactor. Whereas at 20 days SRT VS removal efficiency were higher than control reactor by 32% and 36% respectively, for part stream and full stream reactor. TS removal efficiency of part stream and full stream reactor were found improved as well at 10 and 20 days SRT. Moreover, ultrasound pretreatment affected to enhance nitrification of part stream and full stream reactor. Due to the higher nitrate concentration was observed in part stream and full stream reactor. However, ultrasound pretreatment could not improved the dewater ability of digested sludge. As removal efficiency observed from part stream reactor were observed as in the same range. Thus, part stream reactor can be the better choice due to economic reasons. A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science in Environmental Engineering and Management. Sewage Purification Activated sludge process Visvanathan, C., Chairperson Thammarat Koottatep, Examination Committee Dutta, Animesh, Examination committee Khanal, Samir Kumar, Examination committee RTG Fellowship, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-07-25 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B10784 .b11890940 mnait u 240404 0 071112 m a u 0 mnait mnarc 22 40 Barcode : 30050120743413 CREATED : 2014-02-13 RECORD # : i12764772 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160049689 CREATED : 2016-05-30 RECORD # : i13003732 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 2657 2657 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.EV-07-25 30050120743413 2026-08-17 16:18:01 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.EV-07-25 30050160049689 2026-08-17 16:18:01 2026-08-17 40