Thesis - faculty.ait.ac.th - Asian Institute of Technology

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(Yoon, et al., 1998). This shows that the complex higher molecular weight compounds could be degraded effectively using membrane bioreactor systems. For the yeast and bacteria effluent, the increase of the COD of below 5 k MW fraction could be explained by the biodegradation of high molecular weight organic substances to compounds below 5 k MW, as confirmed by the decrease of the COD of the 5 k MW UF retentate. Similar results were obtained while treating leachate in aerobic and anaerobic system by Gourdon, et al. (1989). The studies also revealed that recalcitrant organics were non-degradable in anaerobiosis, while it could be degraded to 50% in aerobic conditions. The COD removal after the membrane bioreactor treatment was from 7,500 mg/L to about 1,950 mg/L in both the reactors. Among the COD of 7,500 mg/L, about 5,500 mg/L was removed by the membrane bioreactor system, either through degradation for energy consumption or through assimilation. To further understand the degradable components present in the leachate and their molecular weight distribution, another sample was analyzed with BOD along with COD after fractionation. Figure 4.41 and 4.42 gives the COD and BOD contribution of compounds at different molecular weight. Table H-4 of Appendix H gives the detailed calculation of the results. In the second sample showed a slight difference from the first sample. The > 50 k fraction decreased from 91% to 72% and corresponding increase of the < 5 k from 0 to 18%. When the analysis of the molecular weight fractions having organic matter below MW 500 of the leachate was done, it has been shown that they contain synthetic organics and solvents such as aromatic and alcoholic groups. Phenols, amines and chlorinated organics were also found in this fraction. As suggested earlier, the fractions in 5 k to 10 k and higher molecular weight contained humic and fulvic substances, along with products of municipal dumping and natural fermentation (Slater, et al., 1985). In another study on leachate sample suggested that relatively high concentrations of carbohydrates could be observed in a high molecular weight fractions and substantial quantities of aromatic hydroxyl and carboxylic compounds present in the lower molecular weight fraction (Chian, 1977). 112
COD (mg/L) 8000 6000 4000 2000 COD (%) 0 Raw Leachate Stripped Leachate Figure 4.41 Molecular Weight Cut-off of Leachate (a) COD (mg/L) (b) COD (%) 113 Yeast Effleunt Bacterial Effluent MW>50k MW 10k-50k MW 5k-10k MW50k MW 10k-50k MW 5k-10k MW
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APPLICATION OF MEMBRANE BIOREACTOR
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Abstract Landfill leachate is a com
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Table of Contents Chapter Title Pag
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4.5.6 Cost Analysis for Operation 1
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4.4 Effect of Free Ammonia Concentr
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4.16 COD Concentration in the Influ
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MWCO Molecular Weight Cut-off MWW M
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1.1 Background Chapter 1 Introducti
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generally unsuccessful in removal o
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2.1 Introduction Chapter 2 Literatu
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In the municipal solid waste landfi
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COD/TOC, VS/FS and VFA/TOC ratios o
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Table 2.3 presents the general leac
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Ground water 2.7.1 Seasonal Variati
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Table 2.5 Variation of COD, BOD & B
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entails the re-circulation of leach
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Table 2.8 Summary of Biokinetic Coe
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that extensive loss of nitrogen (up
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ammonia could only be achieved when
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Table 2.10 Treatment Efficiencies o
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Activated Carbon Adsorption Granula
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Colloidal material as well as metal
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iologically, physical-chemical proc
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Ammonia Stripping Air stripping of
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These systems are land intensive wh
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the biological treatment can be rep
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Table 2.16 Typical Leachate Composi
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influent reached 200 mg/L. For the
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Table 2.18 Advantages and Disadvant
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through the effluent. Different ope
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Mixed Liquor Suspended Solids and D
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2.12 Yeasts 2.12.1 Introduction The
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Nishihara ESRC Ltd. (2001) studied
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nitrification-denitrification proce
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Table 3.1 Composition of Simulated
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3.4.1 Ammonia Toxicity The experime
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Figure 3.4 Experiments Conducted to
Page 75 and 76: Leachate Option Ammonia Stripping R
Page 77 and 78: MW larger than 50 kDa, (2) MW betwe
Page 79 and 80: Figure 3.7 Flowchart Showing Ammoni
Page 81 and 82: Chapter 4 Results and Discussion 4.
Page 83 and 84: COD Removal Effeciency (%) COD Remo
Page 85 and 86: MLSS (mg/L) 14000 12000 10000 8000
Page 87 and 88: Specific Growth Rate ( d -1 ) 0.50
Page 89 and 90: change in the predominant species w
Page 91 and 92: Table 4.4 Effect of Free Ammonia Co
Page 93 and 94: Table 4.5 Substrate Utilization by
Page 95 and 96: 4.3.1 Initial Membrane Resistance P
Page 97 and 98: when compared with the present stud
Page 99 and 100: COD Removal Efficiency (%) 90 80 70
Page 101 and 102: (2) TKN Removal Efficiency Prior to
Page 103 and 104: As there was no significant improve
Page 105 and 106: The probable reason for frequent fo
Page 107 and 108: Ammonia Concentration (mg/L) Ammoni
Page 109 and 110: concentration after treatment. Othe
Page 111 and 112: After the chemical cleaning of the
Page 113 and 114: emoval of 38%. A higher removal in
Page 115 and 116: Influent BOD (mg/L) Influent BOD (m
Page 117 and 118: (3) TKN Removal Efficiency The TKN
Page 119 and 120: Figure 4.34 gives the overall TKN r
Page 121 and 122: fraction and slowly biodegradable C
Page 123 and 124: BOD (mg/L) BOD (mg/L) 6000 5000 400
Page 125: Figure 4.39 Molecular Weight Cut-of
Page 129 and 130: Though, the obtained COD removal ef
Page 131 and 132: cake used on the top of the membran
Page 133 and 134: Chapter 5 Conclusions and Recommend
Page 135 and 136: 0.02, respectively. This can be con
Page 137 and 138: References Abeling, U., and Seyfrie
Page 139 and 140: Brown, M.J., and Lester, J.N., 1980
Page 141 and 142: Diamadopoulos, E., 1994. Characteri
Page 143 and 144: Grady, C.P.L., Daigger, G.T., and L
Page 145 and 146: Keenan, J.D., Steiner, R.L., and Fu
Page 147 and 148: Martin, G.M.A., Auzmenti, A.I., and
Page 149 and 150: Pohland, F.G., and Harper, S.R., 19
Page 151 and 152: Shin, H.S., An, H., Kang, S.T., Cho
Page 153 and 154: Visvanathan, C., Ben Aim, R., and P
Page 155 and 156: Appendix A Pictures of Experiments
Page 157 and 158: Raw Leachate YMBR Effluent BMBR Eff
Page 159 and 160: Appendix B Leachate Characteristics
Page 161 and 162: Table B-2 Acclimation of Mixed Yeas
Page 163 and 164: Appendix C Experimental Data of Bio
Page 165 and 166: y: Where: OUR at line g: This is th
Page 167 and 168: Table C-3 Experimental Results for
Page 169 and 170: Appendix D Membrane Resistance Stud
Page 171 and 172: Table D-3 Experimental Data for Det
Page 173 and 174: Table D-4 Experimental Data for Det
Page 175 and 176: Pressure (kPa) Pressure (kPa) 25 20
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Appendix E MBR without Ammonia Stri
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Day HRT (h) pH COD (mg/L) Feed Reac
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Day HRT (h) pH COD (mg/L) Feed Reac
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Table E-3 Variation in TMP with Tim
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Appendix F Ammonia Stripping Studie
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Table F-5 Pilot Scale Study on Ammo
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Table G-1 Feed, Reactor and Effluen
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Table G-3 Feed, Reactor and Effluen
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Appendix H Other Studies 179
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Table H-2 Membrane Resistance of th
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Table H-6 Chemical Cost for the Yea
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Thesis - faculty.ait.ac.th - Asian Institute of Technology

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