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035 _a.b10606166
041 0 _aEn
099 _aAIT Thesis no. EV-94-29
100 _aYuthana Tanwongwan
245 0 _aSludge bulking and its control in modified A/O processes
260 _aBangkok :
_bAsian Institute of Technology,
_c1994
300 _a83 leaves
440 0 _aAsian Institute of Technology. Thesis ;
_vno. EV-94-29
500 _aA thesis submitted in partial fulfillment of the requirement for the degree of Master of Science, School of Environment, Resources & Development
502 _aThesis (M. Sc.) - Asian Institute of Technology, 1994
520 _aIt is known that A/O process can produce well-settling sludge. But sludge bulking can also occur in these processes due to some causes such as composition of wastewater, operating conditions, and, configurations of the systems. From this experiment, it has been observed that 0.2 mIJL of acetic acid can cause zoogloea bulking in A/O processes which had only two anaerobic tanks but the process that had three anaerobic tanks can control this kind of bulking. It also has been observed that strictly anaerobic initial contact zone (ICZ) can suppress filamentous bulking more effective than anoxic one. Furthermore, some of unsuitable operating conditions , i.e. too low organic loading, too high return sludge ratio, and too long influent hydraulic retention time can deteriorate sludge settleability and phosphorus removal efficiency but improve the removal efficiency of nitrogen. Additionally, it has been found that concept of contact stabilization activated sludge, i.e. reaeration of return sludge, is difficult to be applied with A/O process because it can introduce small amount of dissolved oxygen into ICZ so filamentous bacteria can use this 00 as electron acceptor in their metabolic mechanisms. Floes in units which had reaeration were very small siz.e and not compact.
650 0 _aSewage
_xPurification
_xActivated sludge process
700 0 _aSamorn Muttamara,
_eChairperson
700 1 _aLee, Seong-Key,
_eExamination Committee
700 1 _aUmita, Teruyuki,
_eExamination Committee
710 2 _aRoyal Thai Government,
_eScholarship Donor
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B15803
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