03521cas|a2200409 i 4500 20260817162230.0 230399s1993 th uzm rtt 00| a1eng d .b10079075 AIT Thesis no.EV-93-29 Kanchit Wongsaengchantra Anaerobic-oxic activated sludge process for the treatment on modified tapioca starch wastewater Bangkok : Asian Institute of Technology, 1993 88 leaves + 1 online resource Thesis ; no. EV-93-29 A thesis s ubmitt ed in partial fulfillment of the requirements for the degree of Master of Science Thesis (M.Sc.) - Asian Institute of Technology, 1993 Two batch and one continuous laboratory scale reactors of anaerobic-oxic activated sludge process were carried out to treat modified tapioca starch wastewater. The batch reactors #1 and #2 were operated at different Food/Microorganism (F/M) ratio ranging from 0.2 - 0.7 and 0.3 - 1.0, respectively. While the continuous reactor was operated with F/M ranging from 0.3-1.0. The batch reactors achieved around 90% COD removal efficiency. However when chemica1 pretreatment was app1ied, the COD removal efficiency increased to around 92%. The SVI values obtained from those batch studies were ranging from 47-180 ml/g which indicated good sludge settleability. Although the microscopic observations showed the existence of short filamentous microorganism in the batch reactors it did not affect the settleability of sludge. Further, the continuous reactor yielded an average COD removal efficiency of 93% which was higher than that of batch reactors. In this study very good sludge settleability was also obtained which was evidenced by the SVI values ranging from 40-120 mL /g. The microscopic observations did not show existence of any filamentous microorganism in the reactor. However, the effluent quality obtained from this study in terms of COD was around 150 mg/L, which was higher than the normally expected value of around 100 mg/L. Therefore a series of studies were carried out to reduce the COD value to lower than 100 mg/L. Powdered activated carbon dose of 1g for 1L of effluent with a contact time of 1 hr. produced a final effluent having COD value less than 100 mg/L. Sewage Purification Activated sludge process Samorn Muttamara, Chairperson Tanaka, Shuzo, Examination committee Sompol Boonthanon, Examination committee Government of New Zealand, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-93-29 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16679 .b10079075 mnait x 240410 2 951012 m a x 0 mnait mnait mnarc 20 40 Barcode : 30050003047437 CREATED : 1994-05-16 RECORD # : i10080144 LPATRON : 1024483 LCHKIN : 2013-05-16 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050003047445 CREATED : 1994-05-16 RECORD # : i10080156 LPATRON : 1017427 LCHKIN : 2004-10-10 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 7 TOT RENEW : 2 Barcode : 30050160055678 CREATED : 2016-11-05 RECORD # : i12975217 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 4369 4369 0 0 0 0 MAIN MAIN mnait 2026-08-17 10.00 0 AIT Thesis no.EV-93-29 30050003047437 2026-08-17 16:22:30 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 10.00 0 AIT Thesis no.EV-93-29 30050003047445 2026-08-17 16:22:30 2 2026-08-17 20 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.EV-93-29 30050160055678 2026-08-17 16:22:30 2026-08-17 40