000 04376nas|a2200457 i 4500
005 20260817161630.0
008 041112s2004 th uzm rtt 00| a1eng d
035 _a.b11947512
099 9 _aAIT Thesis no.EV-04-21
100 1 _aSumanaweera, Sumitha
245 1 0 _aAdvanced oxidation combined with a membrane :
_bbio-reactor for landfill leachate treatment
260 _aPathum Thani, Thailand :
_bAsian Institute of Technology,
_c2004
300 _a106 leaves
490 1 _aThesis ;
_vno. EV-04-21
500 _aA thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development
502 _aThesis (M.Eng.) - Asian Institute of Technology, 2004
520 _aTreatment of landfill leachate is a challenge to the present day environmental scientist because direct impact of environmental protection costs is unaffordable to the developing countries. However intangible benefits of such treatment, creates a demand for better treatment techniques. Due to this environmental research is needed toward economic means of protecting the environment. The effort made in this research into the treatment of landfill leachate is a step towards this goal. This work is a study of a biological process combined with a physico chemical method to treat landfill leachate. Use of membrane technology and advanced oxidation by ozonation are being proven to improve the efficiency of treatment of leachate. This study focuses on comparing the efficiency of a Membrane bioreactor (MBR) in landfill leachate treatment at its standalone status supp01ied by ammonia stripping as a pretreatment with continuous recirculation of ozonated effluent into the MBR. Efficiency of the process in terms of COD and BOD5 are mainly studied. Molecular weight cutoff study (MWCO) is used to identify refractory and non refractory fractions of influent and effluent. The systems pretreatment process, ammonia stripping was found to be 59% efficient. Also about 25% BOD5 removal occurred during ammonia stripping reducing BOD5/COD from 0.42 to 0.37. MBR organic loading was in the range of 2 to 3.5 kg/m3/d. Food to microorganism ratio was in the range of 0.25 to 0.44 kg/kg.d of MLSS. MBR process was 71.5% efficient in COD removal and 93% efficient in BOD5 removal. Also it showed a TKN removal efficiency of 35%. This efficiency was achieved with an average MLVSS/MLSS ratio of0.55 in MBR. DSVI of MBR sludge was 22 mL/g on average indicating sludge was difficult to settle. Also the drop in protein to carbohydrate ratio characterizes MBR sludge as difficult to settle. Continuous recirculation of ozonated MBR effluent in 1: 1 ratio with ammonia stripped leachate improved efficiency of MBR in terms of COD from 31 % to 46%. Also TOC removal efficiency increased from 31 % to 37%. The BOD5 removal showed a drop from 93% to 83%. Therefore it can be concluded that recirculation of ozonated effluent causes improvement ofMBR efficiency in a low magnitude.
650 0 _aSanitary landfills
_xLeaching
650 0 _aLeachate
650 0 _aBioreactor landfills
650 0 _aMembrane reactors
700 1 _aVisvanathan, C.,
_eChairperson
700 1 _aShim, Shang-Gyoo,
_eExamination committee
700 0 _aThammarat Koottatep,
_eExamination Committee
710 2 _aJJ/WBGSP,
_eScholarship donor
710 2 _aAsian Institute of Technology,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tThesis ;
_vno. EV-04-21
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B08949
907 _a.b11947512
_bmnait
_cu
902 _a240423
998 _b0
_c041112
_dm
_ea
_fu
_g0
945 _lmnait
945 _lmnait
945 _lmnarc
942 _c20
942 _c40
909 _aBarcode : 30050120706303
_bCREATED : 2003-06-15
_cRECORD # : i1242643x
_dLPATRON : 1016995
_eLCHKIN : 2003-08-13
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 1
_jTOT RENEW : 0
909 _aBarcode : 30050120706295
_bCREATED : 2003-06-15
_cRECORD # : i12426441
_dLPATRON : 1017269
_eLCHKIN : 2004-06-03
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 2
_jTOT RENEW : 1
909 _aBarcode : 30050160050877
_bCREATED : 2016-05-25
_cRECORD # : i1299098x
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
999 _c2050
_d2050