03235nam a2200373 4500 20260817162850.0 120399s1988 th r 0000|00eng d .b10087667 AIT Thesis no. EV-88-25 Mahmood, Talat Application of direct membrane separation to activated sludge process Bangkok : Asian Institute of Technology, 1988 111 p. Thesis ; no. EV-88-25 A Thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development Thesis (M.Eng.) - Asian Institute of Technology, 1988 Feasibility of . hollow fiber microfiltration for solid liquid separation from the aeration tank of an activated sludge process was investigated. The study was divided into short term experiments and a long term experiment. From the short term experiments results. cyclic operation was found effective against inter' module clogginq and hence resulting in stable membrane flux. Out of three different organic loadings given in the long term experiment. 3 kg/Cm3. d) was found to be the critical one. concerning solid liquid separation. 2 kg/( m3. d) was the most suitable loading. Membrane permeate was free of turbidity, free of bacteria, completely nitrified, partially denitrified and very low in effluent COD concentration. The process operated at very high MLSS concentration without sludge wastage. Low values of kinetic coefficients (kd and Y) and F/M ratio were obtained showing little sludge production at steady state. 0. 45 æm membranes operated at '1ower suction pressures than 0.1 æm membranes. The · highest pressure requirement during, around 4 months of operational period was within 0. 5 m head of water employing O'. 45 æm membranes. This idea motivated the use of elevation difference as a · driving force for membrane separation, precluding the pump suction. The proposed system showed better quality of effluent with much lower HRT. and high enough organic 1oading, when compared with the extended aeration process, in context of sludge production. Sewage Purification Activated sludge process Yamamoto, K., Chairperson Orth, Hermann M., Examination Committee Vigneswaran, Saravanamuthu, Examination Committee The Royal Norwegian Government (Norade Scholarship), Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-88-25 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18895 .b10087667 mnait x 240410 2 951012 m a x 0 mnait mnait 20 Barcode : 30050004250881 CREATED : 1994-05-16 RECORD # : i10093096 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003044608 CREATED : 1994-05-16 RECORD # : i10093102 LPATRON : 1012435 LCHKIN : 2000-02-28 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 4 TOT RENEW : 0 6554 6554 0 0 0 0 MAIN MAIN mnait 2026-08-17 10.00 0 AIT Thesis no. EV-88-25 30050004250881 2026-08-17 16:28:50 1 2026-08-17 20 0 0 0 0 MAIN MAIN mnait 2026-08-17 10.00 0 AIT Thesis no. EV-88-25 30050003044608 2026-08-17 16:28:50 2 2026-08-17 20