03926nas|a2200421 i 4500 20260818090424.0 050715s2004 th uu|m rtt 0| a1eng d .b11966762 AIT Thesis no.EV-04-19 Rung Khumkhom Determination of optimum operating conditions of baffled septic tank systems treating blackwater Pathum Thani, Thailand : Asian Institute of Technology, 2004 125 leaves : ill. Thesis ; no. EV-04-19 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, 2004 This study was conducted to determine the optimum organic loading rate (OLR) and effects of linear alkyl sulfonate (LAS) in the baffled septic tank systems treating blackwater. For determination of the optimum OLR, four laboratory-scale baffled septic tank units, made of acrylic plastic with dimensions of 0.25x0.4x0.64 m3 (width x height x length), were operated at the OLR of 0.5-1.25 g COD/(L.d). The wastewater was a mixture of septage and domestic wastewater. It was found that the removal efficiencies of baffled septic tank systems in terms of COD, BOD, and TS would increase with the increase of OLR at the magnitudes of greater than 80%, 70%, and 60%, respectively. Because clogging problems have been found in the laboratory-scale units operating at the highest OLR of 1.25 g COD/(L.d), the optimum OLR should be 1 g COD/(L.d). In addition, the investigations of treatment performance indicated that a septic tank with tlu·ee baffles (R.2) was the best as compared to other units. For investigations of the LAS effects, the laboratory-scale units were operated at the OLR of 1 g COD/(L.d) and fed with LAS of 0.5-1.0 g. It was found that the removal efficiencies of septic tank with three baffles (R.2) and septic tank with two baffles and anaerobic media (R.4) in terms of COD, TS, and TSS would have no effect with the increase of LAS loading. A conventional septic tank (R.1) or a septic tank with two baffles (R.3), the removal efficiencies in term of COD, TS, and TSS would increase with the increase of LAS loading, and be greater than 85%, 70%, and 85%, respectively. Based on fluorescence in situ hybridization (FISH) analysis, it was found that the percent of bacterial and archaeal communities of baffled septic tank systems were equal to 22.5% and 5%, respectively, at OLR of 0.5 - 1.25 g COD/(L.d). Both percent of bacterial and archaeal communities would likely increase with the increase of LAS loading. Septic tanks Sewage disposal Thammarat Koottatep, Chairperson Satoh, Hiroyasu, Examination Committee Shipin, Oleg V., Examination Committee Royal Thai Government Fellowship, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-04-19 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B08947 .b11966762 mnait u 240328 0 050715 m a u 0 mnait mnait mnarc 20 40 Barcode : 30050120706345 CREATED : 2004-02-16 RECORD # : i12453018 LPATRON : 1018089 LCHKIN : 2007-02-15 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 2 TOT RENEW : 1 Barcode : 30050120706337 CREATED : 2004-02-16 RECORD # : i1245302x LPATRON : 1028071 LCHKIN : 2018-09-15 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 1 TOT CHKOUT : 4 TOT RENEW : 4 Barcode : 30050160050893 CREATED : 2016-05-25 RECORD # : i12990942 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 28031 28031 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-04-19 30050120706345 2026-08-18 09:04:24 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 50.00 0 AIT Thesis no.EV-04-19 30050120706337 2026-08-18 09:04:24 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no.EV-04-19 30050160050893 2026-08-18 09:04:24 2026-08-18 40