03221nas a2200409 4500 20260818214646.0 301098s1983 th r 000| 0eng d .b10618417 AIT Thesis no.EV-83-17 Pinthita Mungkarndee Solving "sludge bulking" problem in activated sludge process Bangkok : Asian Institute of Technology, 1983 66 leaves : ill. Thesis ; no. EV-83-17 A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science Thesis (M.Sc.) - Asian Institute of Technology, 1983 Sludge bulking often occurs in the completely-mixed activated sludge processes treating carbohydrate waste. Hydrogen peroxide was selected as the chemical for sludge bulking control in this study. The effect of hy- drogen peroxide was studied first in the batch study. It was evident that the optimum effective doses of hydrogen peroxide were 40 and 60 g H202/kg MLSS·d at the SVI of 150-300 mt/g and 300-450 mt/g respectively. And it was also observed that after shock loading from 0.3 to 0.5 kg BODS/kg MLSS·d in the batch system SVI increases from 180-200 to 300-450 mt/g. The second doses of hydrogen peroxide of 60 and 70 g H202/kg MLSS·d could reduce the SVI to 150 mt/g in such unit within 3 and 2 days, respectively. While the second doses of hydrogen peroxide of 40 and 50 g H202/kg MLSS·d were needed to overcome sludge bulking within 4 days. For the continuous completely-mixed system study, the organic loading of 0.4-0.5 kg BODS/kg MLSS·d was found to be optimum with no sludge bulking occurred. In this system the effective dose was found to be 60 g H202/kg MLSS·d in both units operated under different SVI values (800-1,100 mi/g and 300-50 mg/i). The frequency of hydrogen peroxide feeding and contact time exhibit the similar effect in both units. The most effective of hydro- gen peroxide feeding and appropriate contact time were found to be single dose and more than 5 hours, respectively. Water quality management Nepal Phewa Lake Samorn Muttamara, Chairperson Nguyen, Cong Thanh, Co-Advisor Pakit Kiravanich, Examination Committee Japanese Government, Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-83-17 .b10618417 mnait x 230608 2 951012 m a x 0 mnait mnait mnarc 22 40 20 Barcode : 30050120655278 CREATED : 2014-05-02 RECORD # : i12757652 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050120224851 CREATED : 2016-04-05 RECORD # : i12969898 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121074941 CREATED : 2023-03-20 RECORD # : i13439042 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 109445 109445 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-83-17 30050120655278 2026-08-18 21:46:46 3 2026-08-18 22 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-83-17 30050120224851 2026-08-18 21:46:46 2026-08-18 40 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-83-17 30050121074941 2026-08-18 21:46:46 1 2026-08-18 20