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A drinking water treatment plant with conventional treatment uses on disinfection segment consisting of a rectangular basin, with a theoretical detention of 270 min with a baffling factor of 0.5. The average free chlorine residual recorded at the disinfection segment monitoring location in 1.6 mg/L. The lowest free chlorine residual recorded was 1.2 mg/L during peak flow. The water temperature is 5C and pH is 7.5  a) Determine the inactivation ratio if 0.5-log inactivation of Giardia lamblia cysts is required  b) Under these design conditions, have Giardia lamblia cysts been adequently inactivated?  c) Will the plant achieve adequete Giardia lamblia inactivation if 0.5-log inactivation is required but the water temperature is raised to 10C? d) Will the plant achieve adequete Giardia lamblia inactivation if 3-log inactivation is required and the water temperature remain at 5C? e) Will the plant achieve adequete Giardia lamblia inactivation if 3-log inactivation is required and the water temperature is raised to 10C

A drinking water treatment plant with conventional treatment uses on disinfection segment consisting of a rectangular basin, with a theoretical detention of 270 min with a baffling factor of 0.5. The average free chlorine residual recorded at the disinfection segment monitoring location in 1.6 mg/L. The lowest free chlorine residual recorded was 1.2 mg/L during peak flow. The water temperature is 5C and pH is 7.5  a) Determine the inactivation ratio if 0.5-log inactivation of Giardia lamblia cysts is required  b) Under these design conditions, have Giardia lamblia cysts been adequently inactivated?  c) Will the plant achieve adequete Giardia lamblia inactivation if 0.5-log inactivation is required but the water temperature is raised to 10C? d) Will the plant achieve adequete Giardia lamblia inactivation if 3-log inactivation is required and the water temperature remain at 5C? e) Will the plant achieve adequete Giardia lamblia inactivation if 3-log inactivation is required and the water temperature is raised to 10C

Solid Waste Engineering
Solid Waste Engineering
3rd Edition
ISBN:9781305635203
Author:Worrell, William A.
Publisher:Worrell, William A.
Chapter5: Separation Processes
Section: Chapter Questions
Problem 5.32P
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A drinking water treatment plant with conventional treatment uses on disinfection segment consisting of a rectangular basin, with a theoretical detention of 270 min with a baffling factor of 0.5. The average free chlorine residual recorded at the disinfection segment monitoring location in 1.6 mg/L. The lowest free chlorine residual recorded was 1.2 mg/L during peak flow. The water temperature is 5C and pH is 7.5 

a) Determine the inactivation ratio if 0.5-log inactivation of Giardia lamblia cysts is required 

b) Under these design conditions, have Giardia lamblia cysts been adequently inactivated? 

c) Will the plant achieve adequete Giardia lamblia inactivation if 0.5-log inactivation is required but the water temperature is raised to 10C?

d) Will the plant achieve adequete Giardia lamblia inactivation if 3-log inactivation is required and the water temperature remain at 5C?

e) Will the plant achieve adequete Giardia lamblia inactivation if 3-log inactivation is required and the water temperature is raised to 10C

CHLORINE CONCENTRATION (mg/L) (m/L) Notes: <=0.4 0.6 (1) CT ... 1.2 CHLORINE CONCENTRATION 99.9 pi<=6 Log Inactivatione 0.5 1.0 1.5 2.0 2.5 3.0 0.5 2.6 2.8 2333 12 24 13 25 13 13 13 4 13.3GPPRRRRRRER 0.5 1.6 14 -28 1.8 14 2 15 15 跖 26 26 2 5 27 29 29 2.2 2.4 15 30 45 15 16 3 16 32 30 IC 27 40 53 3030900000000号 37 6€ 40 2.6 32 65 2.8 33 66 43 45 46 P88888888 50 龍 18 52 06 53 66 3 34 67 101 = CT for 3-log inactivation 55 55 LS 47 62 58 59 pid=8.0 Log Inactivations 09 19 63 500053SPEEFFER 63 65 69 73 74 79 FFERE233632008 75 a 7 1.0 1.5 2.0 2.5 3.0 0.5 9 90 92 15 15 15 18 93 19 95 19 FFERR3221路2345 30 IC SE 36 <=0.4 50 75 9124 149 0.6 26 51 刀 102 128 153 0.8 26 53 105 132 158 162 1 27 54 108 135 1.2 20 55 83 138 166 1.4 23 57 5 113 142 170 1.6 29 58 7 116 145 174 1.8 30 60 119 149 179 2 30 61 91 121 152 182 2.2 3162 93 124 155 186 38 75 113 2.4 32 63 95 127 158 190 115 97 129 162 194 39 78 117 131 164 197 120 134 168 201 37 TABLE E-3 CT VALUES FOR INACTIVATION 16 63 16 63 16 65 17 33 66 17 34 51 67 17 35 52 69 18 35 53 70 36 4 38 OF GIARDIA CYSTS BY FREE CHLORINE AT 10 C (1) 40 pid=6.5 Log leactivations pi-7.0 Log leactivations 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 29 30 3. 3. 32 33 37 37 38 1.0 44 59 73 75 7 78 05396SRRAFF22- F7 4 X 5 X 85&t 61 45 46 67 47 50 55 57 09 19 9 92 8 EL 80 81 122 90 18 92 18 79 82 83 34 87 104 插 61 95 19 6 66 101 林 71 89 107 56 74 93 111 105 D±uppp001annnn 92 110 17 75 4113 | 126 158 189 130 163 195 19 20 20 21 21 22 22 22 23 137 172 206 41 141 176 211 42 43 44 45 106 143 179 215 111 147 184 221 150 188 225 153 192 230 156 195 234 47 159 199 239 福 162 203 243 49 35 52 EXPER020088888 99 39 40 41 118 148 177 570105 122 153 183 36 38 殊 39 100 133 167 200 40 103 70 106 大約800003369 41 62 37 56 75 93 57 19 43 65 45 67 p = 8.5 Log Inactivations 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 PPPER202229326 80 69 37 104 SFEEE823333635 42 64 85 106 73 109 73 113 78117 120 82 124 127 130 7 133 90 136 71 138 141 6 144 146 42 107 21 43 110 22 4 112 2 45 76 95 14 23 错 97 116 119 122 124 25 50 127 26 51 129 26 52 131 53 9 112 134 27 34 114 86 108 66 -87 109 pi<=9.0 Log Inactivations 79 68 92 81 102 83 103 16 139 174 209 218 151 188 226 156 195 234 160 200 240 165 206 247 169 211 253 173 216 259 IT 21 265 181 226 271 184 230 276 187 234. 281 191 239 195 243 ZII SN HANNARRRR 267 292 21 24 25 27 1.0 23 LD I -7.5 Log Inactivatione 1.5 2.0 03363RRRRRRRED 99 70 72 3104 125 5 107 128 109 138 112- 134 184 137 . 117 140 a 16 120 144 123 47 100 125 150 102 128 153 79 105 138 107 133 136 138 55 83 蜡 2.5 3.0 6 12 109 111 157 160 163 166
Transcribed Image Text:CHLORINE CONCENTRATION (mg/L) (m/L) Notes: <=0.4 0.6 (1) CT ... 1.2 CHLORINE CONCENTRATION 99.9 pi<=6 Log Inactivatione 0.5 1.0 1.5 2.0 2.5 3.0 0.5 2.6 2.8 2333 12 24 13 25 13 13 13 4 13.3GPPRRRRRRER 0.5 1.6 14 -28 1.8 14 2 15 15 跖 26 26 2 5 27 29 29 2.2 2.4 15 30 45 15 16 3 16 32 30 IC 27 40 53 3030900000000号 37 6€ 40 2.6 32 65 2.8 33 66 43 45 46 P88888888 50 龍 18 52 06 53 66 3 34 67 101 = CT for 3-log inactivation 55 55 LS 47 62 58 59 pid=8.0 Log Inactivations 09 19 63 500053SPEEFFER 63 65 69 73 74 79 FFERE233632008 75 a 7 1.0 1.5 2.0 2.5 3.0 0.5 9 90 92 15 15 15 18 93 19 95 19 FFERR3221路2345 30 IC SE 36 <=0.4 50 75 9124 149 0.6 26 51 刀 102 128 153 0.8 26 53 105 132 158 162 1 27 54 108 135 1.2 20 55 83 138 166 1.4 23 57 5 113 142 170 1.6 29 58 7 116 145 174 1.8 30 60 119 149 179 2 30 61 91 121 152 182 2.2 3162 93 124 155 186 38 75 113 2.4 32 63 95 127 158 190 115 97 129 162 194 39 78 117 131 164 197 120 134 168 201 37 TABLE E-3 CT VALUES FOR INACTIVATION 16 63 16 63 16 65 17 33 66 17 34 51 67 17 35 52 69 18 35 53 70 36 4 38 OF GIARDIA CYSTS BY FREE CHLORINE AT 10 C (1) 40 pid=6.5 Log leactivations pi-7.0 Log leactivations 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 29 30 3. 3. 32 33 37 37 38 1.0 44 59 73 75 7 78 05396SRRAFF22- F7 4 X 5 X 85&t 61 45 46 67 47 50 55 57 09 19 9 92 8 EL 80 81 122 90 18 92 18 79 82 83 34 87 104 插 61 95 19 6 66 101 林 71 89 107 56 74 93 111 105 D±uppp001annnn 92 110 17 75 4113 | 126 158 189 130 163 195 19 20 20 21 21 22 22 22 23 137 172 206 41 141 176 211 42 43 44 45 106 143 179 215 111 147 184 221 150 188 225 153 192 230 156 195 234 47 159 199 239 福 162 203 243 49 35 52 EXPER020088888 99 39 40 41 118 148 177 570105 122 153 183 36 38 殊 39 100 133 167 200 40 103 70 106 大約800003369 41 62 37 56 75 93 57 19 43 65 45 67 p = 8.5 Log Inactivations 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 PPPER202229326 80 69 37 104 SFEEE823333635 42 64 85 106 73 109 73 113 78117 120 82 124 127 130 7 133 90 136 71 138 141 6 144 146 42 107 21 43 110 22 4 112 2 45 76 95 14 23 错 97 116 119 122 124 25 50 127 26 51 129 26 52 131 53 9 112 134 27 34 114 86 108 66 -87 109 pi<=9.0 Log Inactivations 79 68 92 81 102 83 103 16 139 174 209 218 151 188 226 156 195 234 160 200 240 165 206 247 169 211 253 173 216 259 IT 21 265 181 226 271 184 230 276 187 234. 281 191 239 195 243 ZII SN HANNARRRR 267 292 21 24 25 27 1.0 23 LD I -7.5 Log Inactivatione 1.5 2.0 03363RRRRRRRED 99 70 72 3104 125 5 107 128 109 138 112- 134 184 137 . 117 140 a 16 120 144 123 47 100 125 150 102 128 153 79 105 138 107 133 136 138 55 83 蜡 2.5 3.0 6 12 109 111 157 160 163 166
CHLORINE CONCENTRATION (mg/L) <=0.4 (mg/L) 0.6 0.8 Source: AWWA, 1991. 1 1.2 1.4 2468 NN4600 1.6 NNNN 1.8 2 2.2 2.4 CHLORINE CONCENTRATION <=0.4 0.6 0.8 WOO ANNOSN 00 NNNN 1 1.2 1.4 1.6 2.6 20 2.8 21 3 21 Table C-2. CT Values for Inactivation of Giardia Cysts by Free Chlorine at 5°C pH<=6 Log Inactivation pH=6.5 Log Inactivation pH=7.0 Log Inactivation 16 97 33 50 67 83 100 20 39 20 40 20 41 59 78 98 117 60 80 100 120 61 81 102 122 63 17 34 52 69 86 103 24 83 104 125 25 53 70 88 105 35 36 54 71 89 107 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 32 49 65 81 23 46 70 93 116 139 28 24 49 72 95 119 143 29 49 73 97 122 146 29 50 75 99 124 85 106 127 25 51 76 101 127 78 103 129 79 105 132 81 108 135 83 110 138 85 113 141 86 115 143 91 109 97 108 130 26 36 55 73 56 74 38 57 76 37 39 58 77 39 59 79 40 60 41 61 41 62 83 103 124 42 63 84 105 126 93 111 95 114 97 116 98 118 80 100 120 81 102 122 52 88 110 132 26 53 90 113 135 27 54 92 115 138 28 55 93 117 140 28 56 95 119 143 29 57 29 58 30 59 149 30 152 31 155 31 158 32 162 33 165 33 169 34 172 35 175 36 178 36 182 37 30 61 88 117 146 89 119 148 91 121 152 pH=9.0 Log Inactivation 2.4 SOTTOBR922888 2.6 17 2.8 18 3 18 70 105 36 72 108 74 111 76 114 77 116 1.8 40 79 119 81 122 83 124 84 127 86 129 88 132 89 134 18 19 19 19 20 20 2 41 2.2 41 15 33 34 35 38 37 38 39 FFQ3445 0.5 pH=8.0 Log Inactivation 68 102 1.0 1.5 2.0 2.5 3.0 66 99 132 165 198 136 170 204 140 175 210 144 180 216 147 184 221 151 189 227 155 193 232 159 198 238 162 203 243 165 207 248 169 211 253 172 215 258 175 219 263 179 223 268 42 88888 21 42 42 64 22 43 65 22 44 66 23 45 69 23 46 69 23 47 70 24 48 72 24 49 73 25 49 74 99 123 148 97 122 146 25 50 76 101 126 151 pH=8.5 Log Inactivation 1.0 1.5 2.0 2.5 3.0 79 118 157 197 236 0.5 39 41 81 122 163 203 244 42 84 126 168 210 252 43 87 130 173 217 260 45 89 134 178 223 267 46 91 137 183 228 274 47 94 141 197 234 281 48 96 144 191 239 287 49 98 147 196 245 294 50 100 150 200 250 300 51 102 153 204 255 306 52 104 156 208 260 312 53 106 159 212 265 318 54 108 162 216 270 324 0.5 47 49 97 146 194 243 50 100 151 201 251 52 104 156 208 260 53 107 160 213 267 55 110 165 219 274 56 112 169 225 281 58 115 173 230 288 59 118 177 235 294 60 120 181 241 301 61 123 184 245 307 63 125 189 250 313 64 127 191 255 318 65 130 195 259 324 1.0 1.5 2.0 2.5 93 140 186 233 3.0 279 291 301 312 320 329 337 345 353 361 368 375 382 389 pH=7.5 Log Inactivation 1.0 1.5 2.0 2.5 3.0 55 83 111 138 166 57 86 114 143 171 88 117 146 175 90 119 149 179 92 122 153 183 187 192 58 60 61 62 64 65 98 131 163 94 125 156 96 128 160 196 200 67 100 133 167 68 102 136 170 204 70 105 139 174 209 213 217 221 71 107 142 178 72 109 145 181 74 111 147 184
Transcribed Image Text:CHLORINE CONCENTRATION (mg/L) <=0.4 (mg/L) 0.6 0.8 Source: AWWA, 1991. 1 1.2 1.4 2468 NN4600 1.6 NNNN 1.8 2 2.2 2.4 CHLORINE CONCENTRATION <=0.4 0.6 0.8 WOO ANNOSN 00 NNNN 1 1.2 1.4 1.6 2.6 20 2.8 21 3 21 Table C-2. CT Values for Inactivation of Giardia Cysts by Free Chlorine at 5°C pH<=6 Log Inactivation pH=6.5 Log Inactivation pH=7.0 Log Inactivation 16 97 33 50 67 83 100 20 39 20 40 20 41 59 78 98 117 60 80 100 120 61 81 102 122 63 17 34 52 69 86 103 24 83 104 125 25 53 70 88 105 35 36 54 71 89 107 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 1.0 1.5 2.0 2.5 3.0 0.5 32 49 65 81 23 46 70 93 116 139 28 24 49 72 95 119 143 29 49 73 97 122 146 29 50 75 99 124 85 106 127 25 51 76 101 127 78 103 129 79 105 132 81 108 135 83 110 138 85 113 141 86 115 143 91 109 97 108 130 26 36 55 73 56 74 38 57 76 37 39 58 77 39 59 79 40 60 41 61 41 62 83 103 124 42 63 84 105 126 93 111 95 114 97 116 98 118 80 100 120 81 102 122 52 88 110 132 26 53 90 113 135 27 54 92 115 138 28 55 93 117 140 28 56 95 119 143 29 57 29 58 30 59 149 30 152 31 155 31 158 32 162 33 165 33 169 34 172 35 175 36 178 36 182 37 30 61 88 117 146 89 119 148 91 121 152 pH=9.0 Log Inactivation 2.4 SOTTOBR922888 2.6 17 2.8 18 3 18 70 105 36 72 108 74 111 76 114 77 116 1.8 40 79 119 81 122 83 124 84 127 86 129 88 132 89 134 18 19 19 19 20 20 2 41 2.2 41 15 33 34 35 38 37 38 39 FFQ3445 0.5 pH=8.0 Log Inactivation 68 102 1.0 1.5 2.0 2.5 3.0 66 99 132 165 198 136 170 204 140 175 210 144 180 216 147 184 221 151 189 227 155 193 232 159 198 238 162 203 243 165 207 248 169 211 253 172 215 258 175 219 263 179 223 268 42 88888 21 42 42 64 22 43 65 22 44 66 23 45 69 23 46 69 23 47 70 24 48 72 24 49 73 25 49 74 99 123 148 97 122 146 25 50 76 101 126 151 pH=8.5 Log Inactivation 1.0 1.5 2.0 2.5 3.0 79 118 157 197 236 0.5 39 41 81 122 163 203 244 42 84 126 168 210 252 43 87 130 173 217 260 45 89 134 178 223 267 46 91 137 183 228 274 47 94 141 197 234 281 48 96 144 191 239 287 49 98 147 196 245 294 50 100 150 200 250 300 51 102 153 204 255 306 52 104 156 208 260 312 53 106 159 212 265 318 54 108 162 216 270 324 0.5 47 49 97 146 194 243 50 100 151 201 251 52 104 156 208 260 53 107 160 213 267 55 110 165 219 274 56 112 169 225 281 58 115 173 230 288 59 118 177 235 294 60 120 181 241 301 61 123 184 245 307 63 125 189 250 313 64 127 191 255 318 65 130 195 259 324 1.0 1.5 2.0 2.5 93 140 186 233 3.0 279 291 301 312 320 329 337 345 353 361 368 375 382 389 pH=7.5 Log Inactivation 1.0 1.5 2.0 2.5 3.0 55 83 111 138 166 57 86 114 143 171 88 117 146 175 90 119 149 179 92 122 153 183 187 192 58 60 61 62 64 65 98 131 163 94 125 156 96 128 160 196 200 67 100 133 167 68 102 136 170 204 70 105 139 174 209 213 217 221 71 107 142 178 72 109 145 181 74 111 147 184
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