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574 J.P. Chen et al. Fig. 13.5. Schematic drawing of a tubular module. Feed Permeate Retentate Membranes Spacer Permeate Membranes Retentate Permeate Permeate through tubes in series or parallel. Purified water passes through the membrane, through the porous tube, and drops off into a convenient collection receptacle for removal from the system. The tubular system has the advantage that it can be operated on extremely turbid feed waters and can be cleaned either mechanically or hydraulically with ease. It has the disadvantage of very high capital costs when compared with either the spiral or the hollow fine fiber for water treatment applications. 3.1.4. Flat Configuration In the plate and frame design (Fig. 13.6), membranes are attached to both sides of a rigid plate. The plate may be constructed of solid plastic with grooved channels on the surface, porous fiberglass materials, or reinforced porous paper. The plate/frame membrane units are placed in a pressurized vessel in a configuration that allows feed water to contact all sides of Feed Fig. 13.6. Schematic drawing of a flat configuration module. Retentate Feed
Desalination of Seawater by Reverse Osmosis 575 the plates. Feed water under pressure is fed though the vessel and concentrated brine is removed from the other end. Each plate in the vessel is at low pressure so that water passes through the membrane which is in contact with the high-pressure brine and is collected in the porous media. Fresh water is collected from all the plates. This design is useful for chemical process applications but, because of its complexity, is very expensive to operate for large-scale operations. 3.2. Plant Configuration of Membrane Modules 3.2.1. Plant Configuration A typical RO plant configuration generally includes raw water pumps, pretreatment, membrane units, disinfection units, storage, and distribution elements. For desalination application, membrane units are often configured into a multistage continuous process. In such a system, the concentration of the feed stream increases gradually along the length of several stages of membrane modules arranged in series (Fig. 13.7). The feed reaches its final concentration only at the last stage. Variations in water temperature and fouling degree of the feed water are compensated by adjustments of the feed pressure. In some case, concentrate recirculation is used to achieve a high enough system recovery. Part of the concentrate is directed back to the feed water side of the module. The recycled concentrate mixes with the feed water and will be treated once more. Other design considerations for membrane units are discussed next. FEED WATER PRESSURE The feed pressure is determined by the flux, the energy loss in the system, and the osmotic pressure in the membrane system. The required feed pressure will increase when the membrane elements become contaminated with time. A feed pump that enables a higher flow than the theoretically required flow will then be preferred to keep the feed pressure continual. Generally, a feed pump that increases the feed pressure by 25% will be satisfactory in practice. Typical feed pressures range from 5 to 24 bars. RO systems rated at less than Feed Stage 1 Permeate Stage 2 Permeate Stage 3 Permeate Retentate Stage 4 Fig. 13.7. Schematic flow-diagram of a multistage continuous RO process.
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Membrane and Desalination Technolog
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Editors Dr. Lawrence K. Wang Zorex
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vi Preface Our treatment of polluti
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Contents Preface . ................
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Contents xi 3.4. Considering Existi
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Contents xiii 7. Membrane Separatio
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Contents xv 6. Design for Large Com
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Contents xvii 13. Desalination of S
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Contributors JIRAPAT ANANPATTARACHA
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CONTENTS 1 Membrane Technology: Pas
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Membrane Technology: Past, Present
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48 J. Ren and R. Wang Key Words Pol
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50 J. Ren and R. Wang Nonporous den
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52 J. Ren and R. Wang pervaporation
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54 J. Ren and R. Wang HO HO OH O OH
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56 J. Ren and R. Wang Fig. 2.7 Chem
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58 J. Ren and R. Wang N O O 3.10. P
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60 J. Ren and R. Wang inversion, th
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62 J. Ren and R. Wang where Dm i an
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64 J. Ren and R. Wang as nucleation
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66 J. Ren and R. Wang and no polyme
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68 J. Ren and R. Wang where b ¼ v1
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70 J. Ren and R. Wang S gelation ti
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72 J. Ren and R. Wang structure wil
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74 J. Ren and R. Wang Viscous finge
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76 J. Ren and R. Wang nonsolvent so
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78 J. Ren and R. Wang Thickness of
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80 J. Ren and R. Wang 5.1.1. Rheolo
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82 J. Ren and R. Wang the spinneret
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84 J. Ren and R. Wang Dynamic visco
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86 J. Ren and R. Wang where A is th
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88 J. Ren and R. Wang In the spinni
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90 J. Ren and R. Wang stress, espec
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92 J. Ren and R. Wang solution at t
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94 J. Ren and R. Wang TIPS ¼ Therm
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96 J. Ren and R. Wang 5. Kesting RE
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98 J. Ren and R. Wang 51. Matsuyama
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100 J. Ren and R. Wang 92. Ren J, C
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102 L. Song and K.Guan Tay Key Word
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104 L. Song and K.Guan Tay Flux A A
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106 L. Song and K.Guan Tay increase
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108 L. Song and K.Guan Tay Table 3.
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110 L. Song and K.Guan Tay • A fe
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112 L. Song and K.Guan Tay Feed wat
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114 L. Song and K.Guan Tay Fouling
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116 L. Song and K.Guan Tay Fouling
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118 L. Song and K.Guan Tay The symb
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120 L. Song and K.Guan Tay Table 3.
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122 L. Song and K.Guan Tay Permeate
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124 L. Song and K.Guan Tay Average
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128 L. Song and K.Guan Tay generati
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132 L. Song and K.Guan Tay flux. Un
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134 L. Song and K.Guan Tay 14. Kaak
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136 N.K. Shammas and L.K. Wang remo
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138 N.K. Shammas and L.K. Wang The
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140 N.K. Shammas and L.K. Wang excu
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142 N.K. Shammas and L.K. Wang dire
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144 N.K. Shammas and L.K. Wang broa
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146 N.K. Shammas and L.K. Wang remo
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148 N.K. Shammas and L.K. Wang 4. T
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150 N.K. Shammas and L.K. Wang 8. S
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152 N.K. Shammas and L.K. Wang 4.5.
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154 N.K. Shammas and L.K. Wang Tabl
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156 N.K. Shammas and L.K. Wang phys
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158 N.K. Shammas and L.K. Wang mono
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164 N.K. Shammas and L.K. Wang Fig.
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170 N.K. Shammas and L.K. Wang CSTR
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172 N.K. Shammas and L.K. Wang chec
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178 N.K. Shammas and L.K. Wang 4. C
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182 N.K. Shammas and L.K. Wang Sens
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188 N.K. Shammas and L.K. Wang 2. 2
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196 N.K. Shammas and L.K. Wang PFR
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198 N.K. Shammas and L.K. Wang 16.
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5 Treatment of Industrial Effluents
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Treatment of Industrial Effluents,
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CONTENTS 6 Treatment of Food Indust
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Treatment of Food Industry Foods an
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272 J. Paul Chen et al. formation a
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274 J. Paul Chen et al. the rejecte
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276 J. Paul Chen et al. The MF memb
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278 J. Paul Chen et al. Most UF mem
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280 J. Paul Chen et al. The applica
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282 J. Paul Chen et al. solutions a
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284 J. Paul Chen et al. Salt cheese
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286 J. Paul Chen et al. Table 7.2 L
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288 J. Paul Chen et al. Table 7.3 L
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290 J. Paul Chen et al. Fig. 7.7. V
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292 J. Paul Chen et al. Considering
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294 J. Paul Chen et al. Approximati
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296 J. Paul Chen et al. 5.2. The Po
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298 J. Paul Chen et al. into a smal
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300 J. Paul Chen et al. 6.2.3. Tubu
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302 J. Paul Chen et al. Fig. 7.13.
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304 J. Paul Chen et al. a Feed b Me
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306 J. Paul Chen et al. l Product c
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308 J. Paul Chen et al. Feed Permea
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310 J. Paul Chen et al. From Table
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312 J. Paul Chen et al. To calculat
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314 J. Paul Chen et al. biofilm for
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316 J. Paul Chen et al. magnesium,
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318 J. Paul Chen et al. reduction o
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320 J. Paul Chen et al. Table 7.6 C
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322 J. Paul Chen et al. many factor
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324 J. Paul Chen et al. 9.2. Gas Se
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326 J. Paul Chen et al. c w2 ¼ Con
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328 J. Paul Chen et al. 14. Economi
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330 J. Paul Chen et al. 55. Basu OD
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332 J. Paul Chen et al. 99. Teodosi
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334 N.K. Shammas and L.K. Wang 1. I
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348 N.K. Shammas and L.K. Wang 5-20
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CONTENTS 9 Adsorption Desalination:
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Adsorption Desalination: A Novel Me
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434 J. Qin and K.A. Kekre 1. INTROD
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436 J. Qin and K.A. Kekre utilized
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438 J. Qin and K.A. Kekre 3.2. Desc
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440 J. Qin and K.A. Kekre Table 10.
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442 J. Qin and K.A. Kekre Fig. 10.4
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446 J. Qin and K.A. Kekre different
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448 J. Qin and K.A. Kekre protectin
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462 J. Qin and K.A. Kekre 7.2. Desc
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468 J. Qin and K.A. Kekre and anion
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470 J. Qin and K.A. Kekre become on
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472 J. Qin and K.A. Kekre COD ¼ Ch
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474 J. Qin and K.A. Kekre 25. Parso
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476 J. Qin and K.A. Kekre technique
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478 P. Kajitvichyanukul et al. 1. I
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480 P. Kajitvichyanukul et al. of 5
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482 P. Kajitvichyanukul et al. well
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484 P. Kajitvichyanukul et al. The
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486 P. Kajitvichyanukul et al. 3.3.
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488 P. Kajitvichyanukul et al. 4. C
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490 P. Kajitvichyanukul et al. nonp
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492 P. Kajitvichyanukul et al. rDNA
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502 P. Kajitvichyanukul et al. Wate
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504 P. Kajitvichyanukul et al. Tabl
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506 P. Kajitvichyanukul et al. Fig.
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508 P. Kajitvichyanukul et al. Tabl
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512 P. Kajitvichyanukul et al. solu
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516 P. Kajitvichyanukul et al. (b)
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518 P. Kajitvichyanukul et al. 8. A
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520 P. Kajitvichyanukul et al. 52.
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Page 541 and 542: Desalination of Seawater by Thermal
Page 573 and 574: CONTENTS 13 Desalination of Seawate
Page 575 and 576: Desalination of Seawater by Reverse
Page 587: Desalination of Seawater by Reverse
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644 P. Kajitvichyanukul et al. cond
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648 P. Kajitvichyanukul et al. l En
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652 P. Kajitvichyanukul et al. Feed
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654 P. Kajitvichyanukul et al. O 2
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658 P. Kajitvichyanukul et al. holl
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660 P. Kajitvichyanukul et al. wher
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662 P. Kajitvichyanukul et al. 10 L
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670 K. Mohanty and R. Ghosh 1. INTR
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672 K. Mohanty and R. Ghosh municip
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674 K. Mohanty and R. Ghosh 3.2. Tw
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676 K. Mohanty and R. Ghosh Fig. 16
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680 K. Mohanty and R. Ghosh Cabassu
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682 K. Mohanty and R. Ghosh 4.3. Ga
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684 K. Mohanty and R. Ghosh Membran
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688 K. Mohanty and R. Ghosh MBRs ca
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690 K. Mohanty and R. Ghosh two pro
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692 K. Mohanty and R. Ghosh can be
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694 K. Mohanty and R. Ghosh 27. Bel
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696 K. Mohanty and R. Ghosh 70. Fut
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Acceptance testing, 384-385 ACF. Se
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Index 701 Challenge test solution d
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Index 703 Disinfection by-products
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Index 705 Hemodialysis, 2, 6, 281 H
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Index 707 Membrane bioreactor-rever
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Index 709 Microfiltration-reverse o
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Index 711 Physical cleaning, 322-32
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Index 713 Reynolds number, 676, 679
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Index 715 Thermal concentration, 25
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