TY  - SER
AU  - Suwasa Kantawanichkul
AU  - Chongrak Polprasert,
AU  - Yamamoto,Kazuo
AU  - Vigneswaran,Saravanamuthu
AU  - Mino,Takashi
AU  - Athapol Noomhorm,
AU  - Somiya,I.
ED  - Royal Norwegian Government, 
TI  - Application of hollow fiber membrane bioreactor to anaerobic treatment of oily wastewater by photosynthetic bacteria: Rhodobacter sphaeroides
T2  - Dissertation
PY  - 1990///
CY  - Bangkok
PB  - Asian Institute of Technology
KW  - Sewage
KW  - Purification
KW  - Oil removal
N1  - A dissertation submitted in partial fulfillment of the  requirements for the degree of doctor of technical science, School of Environment, Resources and Development; Thesis (Ph.D.) - Asian Institute of Technology, 1990
N2  - The hollow fiber membrane bioreactor combined with  photosynthetic bacteria ,Rhodobacter sphaeroides was proved to b e  suitable for only wastewater treatment The hollow fiber  membrane enhanced the removal of grease and oil efficiency t o  over 90% while the degradation by photosynthetic bacterial one  could achieve 65-75%. The hollow fiber membrane was also  necessary for solid/liquid separation since the settle able sludge  of t his bacteria was only 10 ml/l in 30 min. which is difficult  to settle b y gravity.  Sludge treatment and disposal were not needed for this  system since bacterial cells in the sludge can be directly used  as sing l e cell protein for animal feed and fertilizer .  The protein content o f the wasted sludge was 40% which was  high enough to be used as single cell protein.  Under long solid retention time ( SRT) of 3 0 d a nd s h or t  hydraulic retention time (HRT) of 1. 5 d, maximum ML SS  concentration of 3 , 910 mg/l could be obtain e d, and under short  SRT ( 5 d ) and short HRT (1 .5 d), the maximum biomass harvested  per d ay (660 mg/ d) was achieved. Too s h ort HRT caused clogging  of the membrane a nd too short SRT caused cell washout of the  system .  When high organic loading (8 kgCOD/(m3 .d)) or high hydraulic  loading (1.3 m3 /( m3 .d )) was applied to the system, the high  concentration of grease and oil occurred a nd inhibited t h e  bacterial growtl1 in the reactor. Never the less, the system was  proved to b e stable to high organic loading and high hydraulic  loading (8 kgCOD/(m3 .d) and 1. 3 m3 /(m3 . d ) respectively ). The COD  removal efficiency of the system was 70 - 85%, and further  treatment by other bio- oxidation processes is necessary.  Batch study in small bottles was a l so conducted to study t h e  performance o f Rhodobacter sphaeroides. The inoculum size of 596  was suitable for the system. The growth rate a nd the removal  efficiency of this bacteria were more active under continuous  illumination than under intermittent illumination either by  artificial or s un light.  The kinetic coefficients of Rhodobacter sphaeroides (æm, Y,  Ks and kd ) were d e t ermine d. The value of kd for the bioreactor  with membrane was bigger than the bioreactor with out membrane.  This was possibly caused by some attached growth a t the membrane  fibers which reduced the MLSS concentration in the reactor
UR  - http://203.159.5.9/ait-thesis/detail.php?q=B18151
ER  -