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420 K.C. Ng et al. Fig. 9.17. Effects of the cooling water temperature and chilled water temperature on the system performance (40). 4.6. Adsorption Desalination Plant with Heat Recovery The COP of an AD plant can be significantly improved by using the regenerative schemes. Passive heat recovery is deemed one of the most practical schemes as it requires minimal hardware alterations of the plant. Ng et al. (41) and Wang et al. (43) clarify in detail the principles of passive heat scheme in a four-bed adsorption chiller. Passive recovery can be achieved by using a valve delay scheme where the residual heat left in the flow channels in the beds could be recovered without having to purge the cooling tower. In the same manner, cooling water from the master (cooler) adsorber is used to cool. Valve delay scheme is an effective method for heat recovery and it involves no piping alteration of the existing flow circuits of the AD plant. During switching period, the master desorber needs to be cooled down to adsorption temperature by the cooling water. The cooling water that pushes the residual hot water and gets the heat from the desorber bed is sent to the hot water tank rather than to the cooling water tank, and the hot water that becomes relatively cooled is sent to the cooling water tank instead of sending it back to the hot water tank. This operation can be achieved by just delaying the opening of the valves that control the cooling water and hot water. The valve delay operation can be utilized by just modifying the PLC programming without any major changes in the system hardware. The performance ratio of the system increases for the better with the utilization of isosteric heat energy. The energy saving and the reduction of energy can be seen in Fig. 9.18. It can be noticed that heat recovery by valve delay results in more significant improvement in the performance ratio of the system only when master and slave configuration is operated, as the cooling water can get more heat energy as well as the hot
Adsorption Desalination: A Novel Method 421 Fig. 9.18. Temperature profile of the system hot and cooling water under standard operation scheme and passive heat recovery scheme. Open square Hot water inlet temperature using two different operation schemes. Filled triangle Hot water outlet temperature using standard operation scheme. Filled square Hot water outlet temperature using passive heat recovery scheme. Open diamond Cooling water inlet temperature using two different operation schemes. Filled diamond Cooling water outlet temperature using passive heat recovery scheme. Open triangle Cooling water outlet temperature using standard operation scheme (40). water can be cooled down nearly to the cooling water temperature. The hot water flow rate and cooling water flow rate to the bed must be equal to maintain the water storage capacity when the valve delay scheme is operated. 5. RECENT IMPROVEMENTS OF ADSORPTION DESALINATION PLANT 5.1. Adsorption Desalination Operation at a Relatively Higher Evaporation Temperature At a constant adsorption temperature, the adsorption capacity of silica gel þ water pair increases with the increase in adsorption pressure. El-Sharkawy et al. (44) reported that the SDWP can be significantly increased with an increase in the evaporation temperature of the evaporator. Evaporator pressure can be increased by raising the chilled water inlet temperature. It is noted that the SDWP can also be increased by using (a) the recovery of heat by cooling the cooling water supplied to the adsorption process using a plate heat exchanger (3) and (b) the tapping of heat to the evaporator by injecting part of the flow from cooling tower circuit. In the former method, the advantage lies in the cooling of silica gel during the adsorption process only to a temperature lower than the ambient and thus enhancing the adsorption process of silica gel. The latter method lowers the supply temperature of the coolant from the cooling tower, benefiting both the adsorber and the condenser. Figure 9.19
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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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182 N.K. Shammas and L.K. Wang Sens
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186 N.K. Shammas and L.K. Wang Maxi
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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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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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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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486 P. Kajitvichyanukul et al. 3.3.
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508 P. Kajitvichyanukul et al. Tabl
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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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12 Desalination of Seawater by Ther
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Desalination of Seawater by Thermal
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CONTENTS 13 Desalination of Seawate
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Desalination of Seawater by Reverse
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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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