000 03138cas|a2200421 i 4500
005 20260818133522.0
008 011298s1987 th uzm rtt 00| a1eng d
035 _a.b10331074
099 9 _aAIT Thesis no. EV-87-28
100 0 _aChongchin Polprasert
245 1 0 _aHigh-rate denitrification using upflow filter
260 _aBangkok :
_bAsian Institute of Technology,
_c1987
300 _a60 p.
490 1 _aThesis ;
_vno. EV-87-28
500 _a A thesis submitted in partial fulfilment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 1987
520 _aThe upflow filters were operated to study the denitrification process with respect to the effects of substrates corresponding to different M/N ratios and time over the treatment efficiency. Over 95% of denitrification efficiency was achieved even if M/N ratio was as low as 2. 5; but the optimum M/N ratio for packed-column denitrification was found to be equal to 2 .9. The unit also satisfied the treatment of high loading, of which nitrate-N and methanol concentrations in feed were respectively 200 and 600 mg/L, with a 4 -hr HRT. The gas chromatographic results showed that denitrification and methane production happened together. Since the methane production was found to occur in a proportion to COD loading even with only 1.5-hr HRT, resulting in a low COD effluent, it is proposed that an additional post aeration, after an upflow packed-bed denitrifying unit, would not be required. It was found that the granular biomass was, not only attached to the media surface, but also densely entrapped within the void space. This formation would result in a better treatment efficiency, due to much higher ' self' surface areas for more attachment. The bio-granules were found to contain 50% of volatile solids.
650 0 _aNitrification
650 0 _aFilters and filtration
700 1 _aHanaki, K.,
_eChairperson
700 1 _aOrth, Hermann M.,
_eExamination Committee
700 1 _aVigneswaran, Saravanamuthu,
_eExamination Committee
710 2 _aThe Royal Danish Government,
_eScholarship Donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. EV-87-28
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B19251
907 _a.b10331074
_bmnait
_cx
902 _a240402
998 _b2
_c951012
_dm
_ea
_fx
_g0
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c20
942 _c40
909 _aBarcode : 30050003044087
_bCREATED : 1994-05-17
_cRECORD # : i10411471
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050003044095
_bCREATED : 1994-05-17
_cRECORD # : i10411483
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050120223671
_bCREATED : 2016-10-05
_cRECORD # : i12973324
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c55013
_d55013