04799cas|a2200445 i 4500 20260818095109.0 150399s1990 th uzm rtt 00| a1eng d .b10690815 AIT Thesis no. EV-90-19 Cerino, Grace F. The effect of substrate composition and feeding pattern on the proliferation of filamentous bacteria in the activated sludge process Bangkok : Asian Institute of Technology, 1990 157 p. Thesis ; no. EV-90-19 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, 1990 Filamentous bulking is one of the problems in wastewater treatment that hinders the activated sludge to produce high quality of eff1uent and thus creating a threat to our environment. Such phenomenon is due to proliferation of certain types of filamentous bacteria which are enhanced by certain set of conditions. To cure this problem is to identify the filamentous bacteria that cause bulking and to know the condition s t h at has caused their excessive growth. Th is will give us a n idea on how to control them and inhibit their growth . Substrate composition a nd feeding pat tern are two major factors that affect their proliferation and they are dealt with in this research . Twelve experiments were undertaken in t his study. In every experiment, a combination of one carbon source - either glucose or acetic acid - a nd one nitrogen source - (NH4 ) 2S04 , NaN0 3 or peptone, together with other nutrients was used. Each kind of substrate composition was subjected to two feeding patterns , namely Continuously Stirred (Fed ) Tank Reactor (CSTR) system and Sequential Batch Reactor ( SBR ) system. Sphaerotilus natans has excessively grown in all substrate composition and has caused filamentous bulking in CSTR system. It h as appeared in all experiments (both CSTR a nd SBR ) with NaN03 as the nitrogen source and has caused bulking more rapidly in acetic acid than in glucose . Haliscomenobacter hydrossis has appeared in a l l experiments with (NH4 ) 2 S04 as nitrogen source. I t grew more in SBR system where growth of Sphaerotilus natans was suppressed and it was almost absent in CSTR sytem. Haliscomenobacter h ydrossis did not grow in acetic acid except only when nitrogen source was ( NH4 ) 2 S011. Haliscomenobacter hydrossis grew most in glucose-peptone medium than in any other substrate composition regardless of the feeding pattern. Its growth was better than Sphaerotilus natansin this medium. I n CSTR system, excessive proliferation of filamentous bacteria was observed. Al t ho ugh Haliscomenobacter hydrossis was moderate in n umbers and slowly growing , there was no filamentous bulking in SBR systems. Sphaerotilus natans was also slowly growing in glucose - NaN03 and glucose - peptone medium in SBR system. Th ese two types of filaments were t h e most common filament in t h e activated sludge that were investigated from t h e three wastewater treatment p l ants in Thailand . In addition Type 1702, Noscodia limicola, Type 1701 a nd Type II Sewage Purification Activated sludge process Mino, Takashi, Chairpeson Chongrak Polprasert, Examination Committee Suselo, Tri Binarko, Examination Committee Harada, Hideki, Examination Committee Canadian International Development Agency (CIDA), Scholarship Donor Asian Institute of Technology. Thesis ; no. EV-90-19 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B18372 .b10690815 mnait x 250327 2 951012 m a x 4 mnait mnait mnarc mnarc 20 40 Barcode : 30050003045647 CREATED : 1994-05-19 RECORD # : i10887921 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050003045654 CREATED : 1994-05-19 RECORD # : i10887933 LPATRON : 1017053 LCHKIN : 2005-03-12 # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 1 TOT RENEW : 0 Barcode : 30050120222871 CREATED : 2016-11-05 RECORD # : i1297416x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050121001944 CREATED : 2020-02-11 RECORD # : i1330673x LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 34699 34699 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-90-19 30050003045647 2026-08-18 09:51:09 1 2026-08-18 20 0 0 0 0 MAIN MAIN mnait 2026-08-18 0 AIT Thesis no. EV-90-19 30050003045654 2026-08-18 09:51:09 2 2026-08-18 20 0 0 0 0 MAIN MAIN mnarc 2026-08-18 0 AIT Thesis no. EV-90-19 30050120222871 2026-08-18 09:51:09 2026-08-18 40 0 0 0 0 MAIN MAIN mnarc 2026-08-18 50.00 0 AIT Thesis no. EV-90-19 30050121001944 2026-08-18 09:51:09 3 2026-08-18 20