Ohio Admin. Code 3745-81-72 - Disinfection of water from surface water sources
"Disinfection practice" means the application of a disinfectant to the treatment flow for the purpose of meeting CT requirements of this rule. Significant changes to disinfection practice include any change which will affect the ability of a system to meet the CT requirements of this rule.
Only filtered water flow shall be used in the required CT calculations to meet the minimum log inactivation in table A of this rule, regardless of the disinfectant used.
Actual CT values are obtained by multiplying the residual
disinfectant, C, by the disinfection contact time, T, giving the resultant, CT.
The value of C in milligrams per liter is determined at a point before or at
the first customer. The value of T in minutes is based on the time available
for the disinfectant to work from the point at which it
If no interpolation is used, then the required CT shall be determined at the lower temperature, and at the higher pH, and at the higher residual disinfectant concentration. For Giardia lamblia inactivation at a pH greater than nine, the required CT shall be the same as the required CT at a pH equal to nine. For virus inactivation at a pH greater than nine, the required CT shall be the same as the required CT at a pH equal to ten.
[Note: Refer to the appendix to this rule for more information on how to determine disinfection sufficiency.]
[Comment: The 40 CFR 141.172, 40 CFR 141.170(d), and 40 CFR 141.530 refer to the "Code of Federal Regulations" published on July 1, 2012. At the effective date of this rule, a copy may be obtained from the "Superintendent of Documents, PO Box 371954, Pittsburgh, PA 15250-7954," (866) 512-1800, or http://bookstore.gpo.gov. This document is available for review at "Ohio EPA, Lazarus Government Center, 50 West Town Street, Columbus, OH, 43215-3425."]
Table A Minimum Requirements For Inactivation Or Removal of Cryptosporidium, Giardia Lamblia, and Viruses |
||||||||
Type of Filtration |
Required Minimum Log Removal/Inactivation |
Expected Log Removal by Filtration |
Minimum Log Inactivation by Disinfection |
|||||
Cryptosporidium (Log Removal Only) |
Giardia |
Viruses |
Cryptosporidium |
Giardia |
Viruses |
Giardia |
Viruses |
|
Conventional |
2 |
3 |
4 |
2 |
2.5 |
2.0 |
0.5 |
2.0 |
Direct |
2 |
3 |
4 |
2 |
2.0 |
1.0 |
1.0 |
3.0 |
Slow Sand |
2 |
3 |
4 |
2 |
2.0 |
2.0 |
1.0 |
2.0 |
Comment: Log removal and log inactivation refer to the negative logarithm of the quotient of the concentration of an impurity after treatment divided by the concentration before treatment. For instance, a 99.9 per cent decrease in viruses has a post treatment concentration 0.001 times the pretreatment concentration and a 3 log removal designation. Common conversions include:
Removal designation |
Concentration decrease |
Quotient after/before |
0.5 log |
70% |
0.3 |
1 log |
90% |
0.1 |
1.5 log |
97% |
0.03 |
2 log |
99% |
0.01 |
2.5 log |
99.7 % |
0.003 |
3 log |
99.9 % |
0.001 |
4 log |
99.99 % |
0.0001 |
Table B-1
Required CT For Inactivation
Of Giardia Cysts By Free Chlorine
At 0.5 ° Celsius Or Less
Chlorine Concentration (mg/L) |
pH<=6 |
pH= 6.5 |
pH= 7.0 |
|||||||||||||||
Log Inactivations |
Log Inactivations |
Log Inactivations |
||||||||||||||||
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 |
|
<= 0.4 |
23 |
46 |
69 |
91 |
114 |
137 |
27 |
54 |
82 |
109 |
136 |
163 |
33 |
65 |
98 |
130 |
163 |
195 |
0.6 |
24 |
47 |
71 |
94 |
118 |
141 |
28 |
56 |
84 |
112 |
140 |
168 |
33 |
67 |
100 |
133 |
167 |
200 |
0.8 |
24 |
48 |
73 |
97 |
121 |
145 |
29 |
57 |
86 |
115 |
143 |
172 |
34 |
68 |
103 |
137 |
171 |
205 |
1 |
25 |
49 |
74 |
99 |
123 |
148 |
29 |
59 |
88 |
117 |
147 |
176 |
35 |
70 |
105 |
140 |
175 |
210 |
1.2 |
25 |
51 |
76 |
101 |
127 |
152 |
30 |
60 |
90 |
120 |
150 |
180 |
36 |
72 |
108 |
143 |
179 |
215 |
1.4 |
26 |
52 |
78 |
103 |
129 |
155 |
31 |
61 |
92 |
123 |
153 |
184 |
37 |
74 |
111 |
147 |
184 |
221 |
1.6 |
26 |
52 |
79 |
105 |
131 |
157 |
32 |
63 |
95 |
126 |
158 |
189 |
38 |
75 |
113 |
151 |
188 |
226 |
1.8 |
27 |
54 |
81 |
108 |
135 |
162 |
32 |
64 |
97 |
129 |
161 |
193 |
39 |
77 |
116 |
154 |
193 |
231 |
2 |
28 |
55 |
83 |
110 |
138 |
165 |
33 |
66 |
99 |
131 |
164 |
197 |
39 |
79 |
118 |
157 |
197 |
236 |
2.2 |
28 |
56 |
85 |
113 |
141 |
169 |
34 |
67 |
101 |
134 |
168 |
201 |
40 |
81 |
121 |
161 |
202 |
242 |
2.4 |
29 |
57 |
86 |
115 |
143 |
172 |
34 |
68 |
103 |
137 |
171 |
205 |
41 |
82 |
124 |
165 |
206 |
247 |
2.6 |
29 |
58 |
88 |
117 |
146 |
175 |
35 |
70 |
105 |
139 |
174 |
209 |
42 |
84 |
126 |
168 |
210 |
252 |
2.8 |
30 |
59 |
89 |
119 |
148 |
178 |
36 |
71 |
107 |
142 |
178 |
213 |
43 |
86 |
129 |
171 |
214 |
257 |
3 |
30 |
60 |
91 |
121 |
151 |
181 |
36 |
72 |
109 |
145 |
181 |
217 |
44 |
87 |
131 |
174 |
218 |
261 |
pH= 7.5 |
pH= 8.0 |
pH= 8.5 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
40 |
79 |
119 |
158 |
198 |
237 |
46 |
92 |
139 |
185 |
231 |
277 |
55 |
110 |
165 |
219 |
274 |
329 |
0.6 |
40 |
80 |
120 |
159 |
199 |
239 |
48 |
95 |
143 |
191 |
238 |
286 |
57 |
114 |
171 |
228 |
285 |
342 |
0.8 |
41 |
82 |
123 |
164 |
205 |
246 |
49 |
98 |
148 |
197 |
246 |
295 |
59 |
118 |
177 |
236 |
295 |
354 |
1 |
42 |
84 |
127 |
169 |
211 |
253 |
51 |
101 |
152 |
203 |
253 |
304 |
61 |
122 |
183 |
243 |
304 |
365 |
1.2 |
43 |
86 |
130 |
173 |
216 |
259 |
52 |
104 |
157 |
209 |
261 |
313 |
63 |
125 |
188 |
251 |
313 |
376 |
1.4 |
44 |
89 |
133 |
177 |
222 |
266 |
54 |
107 |
161 |
214 |
268 |
321 |
65 |
129 |
194 |
258 |
323 |
387 |
1.6 |
46 |
91 |
137 |
182 |
228 |
273 |
55 |
110 |
165 |
219 |
274 |
329 |
66 |
132 |
199 |
265 |
331 |
397 |
1.8 |
47 |
93 |
140 |
186 |
233 |
279 |
56 |
113 |
169 |
225 |
282 |
338 |
68 |
136 |
204 |
271 |
339 |
407 |
2 |
48 |
95 |
143 |
191 |
238 |
286 |
58 |
115 |
173 |
231 |
288 |
346 |
70 |
139 |
209 |
278 |
348 |
417 |
2.2 |
50 |
99 |
149 |
198 |
248 |
297 |
59 |
118 |
177 |
235 |
294 |
353 |
71 |
142 |
213 |
284 |
355 |
426 |
2.4 |
50 |
99 |
149 |
199 |
248 |
298 |
60 |
120 |
181 |
241 |
301 |
361 |
73 |
145 |
218 |
290 |
363 |
435 |
2.6 |
51 |
101 |
152 |
203 |
253 |
304 |
61 |
123 |
184 |
245 |
307 |
368 |
74 |
148 |
222 |
296 |
370 |
444 |
2.8 |
52 |
103 |
155 |
207 |
258 |
310 |
63 |
125 |
188 |
250 |
313 |
375 |
75 |
151 |
226 |
301 |
377 |
452 |
3 |
53 |
105 |
158 |
211 |
263 |
316 |
64 |
127 |
191 |
255 |
318 |
382 |
77 |
153 |
230 |
307 |
383 |
460 |
Chlorine Concentration (mg/L) |
pH= 9.0 or pH> 9.0 |
|||||
Log Inactivations |
||||||
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
|
<= 0.4 |
65 |
130 |
195 |
260 |
325 |
390 |
0.6 |
68 |
136 |
204 |
271 |
339 |
407 |
0.8 |
70 |
141 |
211 |
281 |
352 |
422 |
1 |
73 |
146 |
219 |
291 |
364 |
437 |
1.2 |
75 |
150 |
226 |
301 |
376 |
451 |
1.4 |
77 |
155 |
232 |
309 |
387 |
464 |
1.6 |
80 |
159 |
239 |
318 |
398 |
477 |
1.8 |
82 |
163 |
245 |
326 |
408 |
489 |
2 |
83 |
167 |
250 |
333 |
417 |
500 |
2.2 |
85 |
170 |
256 |
341 |
426 |
511 |
2.4 |
87 |
174 |
261 |
348 |
435 |
522 |
2.6 |
89 |
178 |
267 |
355 |
444 |
533 |
2.8 |
91 |
181 |
272 |
362 |
453 |
543 |
3 |
92 |
184 |
276 |
368 |
460 |
552 |
[Comment: CT99.9 = CT for 3 log inactivation.]
Table B-2
Required CT For Inactivation Of Giardia Cysts By Free Chlorine At 5° Celsius
pH<=6 |
pH= 6.5 |
pH= 7.0 |
||||||||||||||||
Chlorine |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
(mg/L) |
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 |
<= 0.4 |
16 |
32 |
49 |
65 |
81 |
97 |
20 |
39 |
59 |
78 |
98 |
117 |
23 |
46 |
70 |
93 |
116 |
139 |
0.6 |
17 |
33 |
50 |
67 |
83 |
100 |
20 |
40 |
60 |
80 |
100 |
120 |
24 |
48 |
72 |
95 |
119 |
143 |
0.8 |
17 |
34 |
52 |
69 |
86 |
103 |
20 |
41 |
61 |
81 |
102 |
122 |
24 |
49 |
73 |
97 |
122 |
146 |
1 |
18 |
35 |
53 |
70 |
88 |
105 |
21 |
42 |
63 |
83 |
104 |
125 |
25 |
50 |
75 |
99 |
124 |
149 |
1.2 |
18 |
36 |
54 |
71 |
89 |
107 |
21 |
42 |
64 |
85 |
106 |
127 |
25 |
51 |
76 |
101 |
127 |
152 |
1.4 |
18 |
36 |
55 |
73 |
91 |
109 |
22 |
43 |
65 |
87 |
108 |
130 |
26 |
52 |
78 |
103 |
129 |
155 |
1.6 |
19 |
37 |
56 |
74 |
93 |
111 |
22 |
44 |
66 |
88 |
110 |
132 |
26 |
53 |
79 |
105 |
132 |
158 |
1.8 |
19 |
38 |
57 |
76 |
95 |
114 |
23 |
45 |
68 |
90 |
113 |
135 |
27 |
54 |
81 |
108 |
135 |
162 |
2 |
19 |
39 |
58 |
77 |
97 |
116 |
23 |
46 |
69 |
92 |
115 |
138 |
28 |
55 |
83 |
110 |
138 |
165 |
2.2 |
20 |
39 |
59 |
79 |
98 |
118 |
23 |
47 |
70 |
93 |
117 |
140 |
28 |
56 |
85 |
113 |
141 |
169 |
2.4 |
20 |
40 |
60 |
80 |
100 |
120 |
24 |
48 |
72 |
95 |
119 |
143 |
29 |
57 |
86 |
115 |
143 |
172 |
2.6 |
20 |
41 |
61 |
81 |
102 |
122 |
24 |
49 |
73 |
97 |
122 |
146 |
29 |
58 |
88 |
117 |
146 |
175 |
2.8 |
21 |
41 |
62 |
83 |
103 |
124 |
25 |
49 |
74 |
99 |
123 |
148 |
30 |
59 |
89 |
119 |
148 |
178 |
3 |
21 |
42 |
63 |
84 |
105 |
126 |
25 |
50 |
76 |
101 |
126 |
151 |
30 |
61 |
91 |
121 |
152 |
182 |
pH= 7.5 |
pH= 8.0 |
pH= 8.5 |
||||||||||||||||
Chlorine |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
(mg/L) |
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 |
<= 0.4 |
28 |
55 |
83 |
111 |
138 |
166 |
33 |
66 |
99 |
132 |
165 |
198 |
39 |
79 |
118 |
157 |
197 |
236 |
0.6 |
29 |
57 |
86 |
114 |
143 |
171 |
34 |
68 |
102 |
136 |
170 |
204 |
41 |
81 |
122 |
163 |
203 |
244 |
0.8 |
29 |
58 |
88 |
117 |
146 |
175 |
35 |
70 |
105 |
140 |
175 |
210 |
42 |
84 |
126 |
168 |
210 |
252 |
1 |
30 |
60 |
90 |
119 |
149 |
179 |
36 |
72 |
108 |
144 |
180 |
216 |
43 |
87 |
130 |
173 |
217 |
260 |
1.2 |
31 |
61 |
92 |
122 |
153 |
183 |
37 |
74 |
111 |
147 |
184 |
221 |
45 |
89 |
134 |
178 |
223 |
267 |
1.4 |
31 |
62 |
94 |
125 |
156 |
187 |
38 |
76 |
114 |
151 |
189 |
227 |
46 |
91 |
137 |
183 |
228 |
274 |
1.6 |
32 |
64 |
96 |
128 |
160 |
192 |
39 |
77 |
116 |
155 |
193 |
232 |
47 |
94 |
141 |
187 |
234 |
281 |
1.8 |
33 |
65 |
98 |
131 |
163 |
196 |
40 |
79 |
119 |
159 |
198 |
238 |
48 |
96 |
144 |
191 |
239 |
287 |
2 |
33 |
67 |
100 |
133 |
167 |
200 |
41 |
81 |
122 |
162 |
203 |
243 |
49 |
98 |
147 |
196 |
245 |
294 |
2.2 |
34 |
68 |
102 |
136 |
170 |
204 |
41 |
83 |
124 |
165 |
207 |
248 |
50 |
100 |
150 |
200 |
250 |
300 |
2.4 |
35 |
70 |
105 |
139 |
174 |
209 |
42 |
84 |
127 |
169 |
211 |
253 |
51 |
102 |
153 |
204 |
255 |
306 |
2.6 |
36 |
71 |
107 |
142 |
178 |
213 |
43 |
86 |
129 |
172 |
215 |
258 |
52 |
104 |
156 |
208 |
260 |
312 |
2.8 |
36 |
72 |
109 |
145 |
181 |
217 |
44 |
88 |
132 |
175 |
219 |
263 |
53 |
106 |
159 |
212 |
265 |
318 |
3 |
37 |
74 |
111 |
147 |
184 |
221 |
45 |
89 |
134 |
179 |
223 |
268 |
54 |
108 |
162 |
216 |
270 |
324 |
pH= 9.0 or pH> 9.0 |
||||||
Chlorine |
Log Inactivations |
|||||
(mg/L) |
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
<= 0.4 |
47 |
93 |
140 |
186 |
233 |
279 |
0.6 |
49 |
97 |
146 |
194 |
243 |
291 |
0.8 |
50 |
100 |
151 |
201 |
251 |
301 |
1 |
52 |
104 |
156 |
208 |
260 |
312 |
1.2 |
53 |
107 |
160 |
213 |
267 |
320 |
1.4 |
55 |
110 |
165 |
219 |
274 |
329 |
1.6 |
56 |
112 |
169 |
225 |
281 |
337 |
1.8 |
58 |
115 |
173 |
230 |
288 |
345 |
2 |
59 |
118 |
177 |
235 |
294 |
353 |
2.2 |
60 |
120 |
181 |
241 |
301 |
361 |
2.4 |
61 |
123 |
184 |
245 |
307 |
368 |
2.6 |
63 |
125 |
188 |
250 |
313 |
375 |
2.8 |
64 |
127 |
191 |
255 |
318 |
382 |
3 |
65 |
130 |
195 |
259 |
324 |
389 |
[Comment: CT99.9 = CT for 3 log inactivation.]
Table B-3
Required CT For Inactivation Of Giardia Cysts By Free Chlorine At 10° Celsius
pH<=6 |
pH= 6.5 |
pH= 7.0 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
12 |
24 |
37 |
49 |
61 |
73 |
15 |
29 |
44 |
59 |
73 |
88 |
17 |
35 |
52 |
69 |
87 |
104 |
0.6 |
13 |
25 |
38 |
50 |
63 |
75 |
15 |
30 |
45 |
60 |
75 |
90 |
18 |
36 |
54 |
71 |
89 |
107 |
0.8 |
13 |
26 |
39 |
52 |
65 |
78 |
15 |
31 |
46 |
61 |
77 |
92 |
18 |
37 |
55 |
73 |
92 |
110 |
1 |
13 |
26 |
40 |
53 |
66 |
79 |
16 |
31 |
47 |
63 |
78 |
94 |
19 |
37 |
56 |
75 |
93 |
112 |
1.2 |
13 |
27 |
40 |
53 |
67 |
80 |
16 |
32 |
48 |
63 |
79 |
95 |
19 |
38 |
57 |
76 |
95 |
114 |
1.4 |
14 |
27 |
41 |
55 |
68 |
82 |
16 |
33 |
49 |
65 |
82 |
98 |
19 |
39 |
58 |
77 |
97 |
116 |
1.6 |
14 |
28 |
42 |
55 |
69 |
83 |
17 |
33 |
50 |
66 |
83 |
99 |
20 |
40 |
60 |
79 |
99 |
119 |
1.8 |
14 |
29 |
43 |
57 |
72 |
86 |
17 |
34 |
51 |
67 |
84 |
101 |
20 |
41 |
61 |
81 |
102 |
122 |
2 |
15 |
29 |
44 |
58 |
73 |
87 |
17 |
35 |
52 |
69 |
87 |
104 |
21 |
41 |
62 |
83 |
103 |
124 |
2.2 |
15 |
30 |
45 |
59 |
74 |
89 |
18 |
35 |
53 |
70 |
88 |
105 |
21 |
42 |
64 |
85 |
106 |
127 |
2.4 |
15 |
30 |
45 |
60 |
75 |
90 |
18 |
36 |
54 |
71 |
89 |
107 |
22 |
43 |
65 |
86 |
108 |
129 |
2.6 |
15 |
31 |
46 |
61 |
77 |
92 |
18 |
37 |
55 |
73 |
92 |
110 |
22 |
44 |
66 |
87 |
109 |
131 |
2.8 |
16 |
31 |
47 |
62 |
78 |
93 |
19 |
37 |
56 |
74 |
93 |
111 |
22 |
45 |
67 |
89 |
112 |
134 |
3 |
16 |
32 |
48 |
63 |
79 |
95 |
19 |
38 |
57 |
75 |
94 |
113 |
23 |
46 |
69 |
91 |
114 |
137 |
pH= 7.5 |
pH= 8.0 |
pH= 8.5 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
21 |
42 |
63 |
83 |
104 |
125 |
25 |
50 |
75 |
99 |
124 |
149 |
30 |
59 |
89 |
118 |
148 |
177 |
0.6 |
21 |
43 |
64 |
85 |
107 |
128 |
26 |
51 |
77 |
102 |
128 |
153 |
31 |
61 |
92 |
122 |
153 |
183 |
0.8 |
22 |
44 |
66 |
87 |
109 |
131 |
26 |
53 |
79 |
105 |
132 |
158 |
32 |
63 |
95 |
126 |
158 |
189 |
1 |
22 |
45 |
67 |
89 |
112 |
134 |
27 |
54 |
81 |
108 |
135 |
162 |
33 |
65 |
98 |
130 |
163 |
195 |
1.2 |
23 |
46 |
69 |
91 |
114 |
137 |
28 |
55 |
83 |
111 |
138 |
166 |
33 |
67 |
100 |
133 |
167 |
200 |
1.4 |
23 |
47 |
70 |
93 |
117 |
140 |
28 |
57 |
85 |
113 |
142 |
170 |
34 |
69 |
103 |
137 |
172 |
206 |
1.6 |
24 |
48 |
72 |
96 |
120 |
144 |
29 |
58 |
87 |
116 |
145 |
174 |
35 |
70 |
106 |
141 |
176 |
211 |
1.8 |
25 |
49 |
74 |
98 |
123 |
147 |
30 |
60 |
90 |
119 |
149 |
179 |
36 |
72 |
108 |
143 |
179 |
215 |
2 |
25 |
50 |
75 |
100 |
125 |
150 |
30 |
61 |
91 |
121 |
152 |
182 |
37 |
74 |
111 |
147 |
184 |
221 |
2.2 |
26 |
51 |
77 |
102 |
128 |
153 |
31 |
62 |
93 |
124 |
155 |
186 |
38 |
75 |
113 |
150 |
188 |
225 |
2.4 |
26 |
52 |
79 |
105 |
131 |
157 |
32 |
63 |
95 |
127 |
158 |
190 |
38 |
77 |
115 |
153 |
192 |
230 |
2.6 |
27 |
53 |
80 |
107 |
133 |
160 |
32 |
65 |
97 |
129 |
162 |
194 |
39 |
78 |
117 |
156 |
195 |
234 |
2.8 |
27 |
54 |
82 |
109 |
136 |
163 |
33 |
66 |
99 |
131 |
164 |
197 |
40 |
80 |
120 |
159 |
199 |
239 |
3 |
28 |
55 |
83 |
111 |
138 |
166 |
34 |
67 |
101 |
134 |
168 |
201 |
41 |
81 |
122 |
162 |
203 |
243 |
pH= 9.0 or pH> 9.0 |
||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
|||||
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
|
<= 0.4 |
35 |
70 |
105 |
139 |
174 |
209 |
0.6 |
36 |
73 |
109 |
145 |
182 |
218 |
0.8 |
38 |
75 |
113 |
151 |
188 |
226 |
1 |
39 |
78 |
117 |
156 |
195 |
234 |
1.2 |
40 |
80 |
120 |
160 |
200 |
240 |
1.4 |
41 |
82 |
124 |
165 |
206 |
247 |
1.6 |
42 |
84 |
127 |
169 |
211 |
253 |
1.8 |
43 |
86 |
130 |
173 |
216 |
259 |
2 |
44 |
88 |
133 |
177 |
221 |
265 |
2.2 |
45 |
90 |
136 |
181 |
226 |
271 |
2.4 |
46 |
92 |
138 |
184 |
230 |
276 |
2.6 |
47 |
94 |
141 |
187 |
234 |
281 |
2.8 |
48 |
96 |
144 |
191 |
239 |
287 |
3 |
49 |
97 |
146 |
195 |
243 |
292 |
[Comment: CT99.9 = CT for 3 log inactivation.]
Table B-4
Required CT For Inactivation Of Giardia Cysts By Free Chlorine At 15° Celsius
pH<=6 |
pH= 6.5 |
pH= 7.0 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
8 |
16 |
25 |
33 |
41 |
49 |
10 |
20 |
30 |
39 |
49 |
59 |
12 |
23 |
35 |
47 |
58 |
70 |
0.6 |
8 |
17 |
25 |
33 |
42 |
50 |
10 |
20 |
30 |
40 |
50 |
60 |
12 |
24 |
36 |
48 |
60 |
72 |
0.8 |
9 |
17 |
26 |
35 |
43 |
52 |
10 |
20 |
31 |
41 |
51 |
61 |
12 |
24 |
37 |
49 |
61 |
73 |
1 |
9 |
18 |
27 |
35 |
44 |
53 |
11 |
21 |
32 |
42 |
53 |
63 |
13 |
25 |
38 |
50 |
63 |
75 |
1.2 |
9 |
18 |
27 |
36 |
45 |
54 |
11 |
21 |
32 |
43 |
53 |
64 |
13 |
25 |
38 |
51 |
63 |
76 |
1.4 |
9 |
18 |
28 |
37 |
46 |
55 |
11 |
22 |
33 |
43 |
54 |
65 |
13 |
26 |
39 |
52 |
65 |
78 |
1.6 |
9 |
19 |
28 |
37 |
47 |
56 |
11 |
22 |
33 |
44 |
55 |
66 |
13 |
26 |
40 |
53 |
66 |
79 |
1.8 |
10 |
19 |
29 |
38 |
48 |
57 |
11 |
23 |
34 |
45 |
57 |
68 |
14 |
27 |
41 |
54 |
68 |
81 |
2 |
10 |
19 |
29 |
39 |
48 |
58 |
12 |
23 |
35 |
46 |
58 |
69 |
14 |
28 |
42 |
55 |
69 |
83 |
2.2 |
10 |
20 |
30 |
39 |
49 |
59 |
12 |
23 |
35 |
47 |
58 |
70 |
14 |
28 |
43 |
57 |
71 |
85 |
2.4 |
10 |
20 |
30 |
40 |
50 |
60 |
12 |
24 |
36 |
48 |
60 |
72 |
14 |
29 |
43 |
57 |
72 |
86 |
2.6 |
10 |
20 |
31 |
41 |
51 |
61 |
12 |
24 |
37 |
49 |
61 |
73 |
15 |
29 |
44 |
59 |
73 |
88 |
2.8 |
10 |
21 |
31 |
41 |
52 |
62 |
12 |
25 |
37 |
49 |
62 |
74 |
15 |
30 |
45 |
59 |
74 |
89 |
3 |
11 |
21 |
32 |
42 |
53 |
63 |
13 |
25 |
38 |
51 |
63 |
76 |
15 |
30 |
46 |
61 |
76 |
91 |
pH= 7.5 |
pH= 8.0 |
pH= 8.5 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
14 |
28 |
42 |
55 |
69 |
83 |
17 |
33 |
50 |
66 |
83 |
99 |
20 |
39 |
59 |
79 |
98 |
118 |
0.6 |
14 |
29 |
43 |
57 |
72 |
86 |
17 |
34 |
51 |
68 |
85 |
102 |
20 |
41 |
61 |
81 |
102 |
122 |
0.8 |
15 |
29 |
44 |
59 |
73 |
88 |
18 |
35 |
53 |
70 |
88 |
105 |
21 |
42 |
63 |
84 |
105 |
126 |
1 |
15 |
30 |
45 |
60 |
75 |
90 |
18 |
36 |
54 |
72 |
90 |
108 |
22 |
43 |
65 |
87 |
108 |
130 |
1.2 |
15 |
31 |
46 |
61 |
77 |
92 |
19 |
37 |
56 |
74 |
93 |
111 |
22 |
45 |
67 |
89 |
112 |
134 |
1.4 |
16 |
31 |
47 |
63 |
78 |
94 |
19 |
38 |
57 |
76 |
95 |
114 |
23 |
46 |
69 |
91 |
114 |
137 |
1.6 |
16 |
32 |
48 |
64 |
80 |
96 |
19 |
39 |
58 |
77 |
97 |
116 |
24 |
47 |
71 |
94 |
118 |
141 |
1.8 |
16 |
33 |
49 |
65 |
82 |
98 |
20 |
40 |
60 |
79 |
99 |
119 |
24 |
48 |
72 |
96 |
120 |
144 |
2 |
17 |
33 |
50 |
67 |
83 |
100 |
20 |
41 |
61 |
81 |
102 |
122 |
25 |
49 |
74 |
98 |
123 |
147 |
2.2 |
17 |
34 |
51 |
68 |
85 |
102 |
21 |
41 |
62 |
83 |
103 |
124 |
25 |
50 |
75 |
100 |
125 |
150 |
2.4 |
18 |
35 |
53 |
70 |
88 |
105 |
21 |
42 |
64 |
85 |
106 |
127 |
26 |
51 |
77 |
102 |
128 |
153 |
2.6 |
18 |
36 |
54 |
71 |
89 |
107 |
22 |
43 |
65 |
86 |
108 |
129 |
26 |
52 |
78 |
104 |
130 |
156 |
2.8 |
18 |
36 |
55 |
73 |
91 |
109 |
22 |
44 |
66 |
88 |
110 |
132 |
27 |
53 |
80 |
106 |
133 |
159 |
3 |
19 |
37 |
56 |
74 |
93 |
111 |
22 |
45 |
67 |
89 |
112 |
134 |
27 |
54 |
81 |
108 |
135 |
162 |
pH= 9.0 or pH> 9.0 |
||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
|||||
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
|
<= 0.4 |
23 |
47 |
70 |
93 |
117 |
140 |
0.6 |
24 |
49 |
73 |
97 |
122 |
146 |
0.8 |
25 |
50 |
76 |
101 |
126 |
151 |
1 |
26 |
52 |
78 |
104 |
130 |
156 |
1.2 |
27 |
53 |
80 |
107 |
133 |
160 |
1.4 |
28 |
55 |
83 |
110 |
138 |
165 |
1.6 |
28 |
56 |
85 |
113 |
141 |
169 |
1.8 |
29 |
58 |
87 |
115 |
144 |
173 |
2 |
30 |
59 |
89 |
118 |
148 |
177 |
2.2 |
30 |
60 |
91 |
121 |
151 |
181 |
2.4 |
31 |
61 |
92 |
123 |
153 |
184 |
2.6 |
31 |
63 |
94 |
125 |
157 |
188 |
2.8 |
32 |
64 |
96 |
127 |
159 |
191 |
3 |
33 |
65 |
98 |
130 |
163 |
195 |
[Comment: CT99.9 = CT for 3 log inactivation.]
Table B-5
Required CT For Inactivation Of Giardia Cysts By Free Chlorine At 20° Celsius
pH<=6 |
pH= 6.5 |
pH= 7.0 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
6 |
12 |
18 |
24 |
30 |
36 |
7 |
15 |
22 |
29 |
37 |
44 |
9 |
17 |
26 |
35 |
43 |
52 |
0.6 |
6 |
13 |
19 |
25 |
32 |
38 |
8 |
15 |
23 |
30 |
38 |
45 |
9 |
18 |
27 |
36 |
45 |
54 |
0.8 |
7 |
13 |
20 |
26 |
33 |
39 |
8 |
15 |
23 |
31 |
38 |
46 |
9 |
18 |
28 |
37 |
46 |
55 |
1 |
7 |
13 |
20 |
26 |
33 |
39 |
8 |
16 |
24 |
31 |
39 |
47 |
9 |
19 |
28 |
37 |
47 |
56 |
1.2 |
7 |
13 |
20 |
27 |
33 |
40 |
8 |
16 |
24 |
32 |
40 |
48 |
10 |
19 |
29 |
38 |
48 |
57 |
1.4 |
7 |
14 |
21 |
27 |
34 |
41 |
8 |
16 |
25 |
33 |
41 |
49 |
10 |
19 |
29 |
39 |
48 |
58 |
1.6 |
7 |
14 |
21 |
28 |
35 |
42 |
8 |
17 |
25 |
33 |
42 |
50 |
10 |
20 |
30 |
39 |
49 |
59 |
1.8 |
7 |
14 |
22 |
29 |
36 |
43 |
9 |
17 |
26 |
34 |
43 |
51 |
10 |
20 |
31 |
41 |
51 |
61 |
2 |
7 |
15 |
22 |
29 |
37 |
44 |
9 |
17 |
26 |
35 |
43 |
52 |
10 |
21 |
31 |
41 |
52 |
62 |
2.2 |
7 |
15 |
22 |
29 |
37 |
44 |
9 |
18 |
27 |
35 |
44 |
53 |
11 |
21 |
32 |
42 |
53 |
63 |
2.4 |
8 |
15 |
23 |
30 |
38 |
45 |
9 |
18 |
27 |
36 |
45 |
54 |
11 |
22 |
33 |
43 |
54 |
65 |
2.6 |
8 |
15 |
23 |
31 |
38 |
46 |
9 |
18 |
28 |
37 |
46 |
55 |
11 |
22 |
33 |
44 |
55 |
66 |
2.8 |
8 |
16 |
24 |
31 |
39 |
47 |
9 |
19 |
28 |
37 |
47 |
56 |
11 |
22 |
34 |
45 |
56 |
67 |
3 |
8 |
16 |
24 |
31 |
39 |
47 |
10 |
19 |
29 |
38 |
48 |
57 |
11 |
23 |
34 |
45 |
57 |
68 |
pH= 7.5 |
pH= 8.0 |
pH= 8.5 |
||||||||||||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
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 |
|
<= 0.4 |
10 |
21 |
31 |
41 |
52 |
62 |
12 |
25 |
37 |
49 |
62 |
74 |
15 |
30 |
45 |
59 |
74 |
89 |
0.6 |
11 |
21 |
32 |
43 |
53 |
64 |
13 |
26 |
39 |
51 |
64 |
77 |
15 |
31 |
46 |
61 |
77 |
92 |
0.8 |
11 |
22 |
33 |
44 |
55 |
66 |
13 |
26 |
40 |
53 |
66 |
79 |
16 |
32 |
48 |
63 |
79 |
95 |
1 |
11 |
22 |
34 |
45 |
56 |
67 |
14 |
27 |
41 |
54 |
68 |
81 |
16 |
33 |
49 |
65 |
82 |
98 |
1.2 |
12 |
23 |
35 |
46 |
58 |
69 |
14 |
28 |
42 |
55 |
69 |
83 |
17 |
33 |
50 |
67 |
83 |
100 |
1.4 |
12 |
23 |
35 |
47 |
58 |
70 |
14 |
28 |
43 |
57 |
71 |
85 |
17 |
34 |
52 |
69 |
86 |
103 |
1.6 |
12 |
24 |
36 |
48 |
60 |
72 |
15 |
29 |
44 |
58 |
73 |
87 |
18 |
35 |
53 |
70 |
88 |
105 |
1.8 |
12 |
25 |
37 |
49 |
62 |
74 |
15 |
30 |
45 |
59 |
74 |
89 |
18 |
36 |
54 |
72 |
90 |
108 |
2 |
13 |
25 |
38 |
50 |
63 |
75 |
15 |
30 |
46 |
61 |
76 |
91 |
18 |
37 |
55 |
73 |
92 |
110 |
2.2 |
13 |
26 |
39 |
51 |
64 |
77 |
16 |
31 |
47 |
62 |
78 |
93 |
19 |
38 |
57 |
75 |
94 |
113 |
2.4 |
13 |
26 |
39 |
52 |
65 |
78 |
16 |
32 |
48 |
63 |
79 |
95 |
19 |
38 |
58 |
77 |
96 |
115 |
2.6 |
13 |
27 |
40 |
53 |
67 |
80 |
16 |
32 |
49 |
65 |
81 |
97 |
20 |
39 |
59 |
78 |
98 |
117 |
2.8 |
14 |
27 |
41 |
54 |
68 |
81 |
17 |
33 |
50 |
66 |
83 |
99 |
20 |
40 |
60 |
79 |
99 |
119 |
3 |
14 |
28 |
42 |
55 |
69 |
83 |
17 |
34 |
51 |
67 |
84 |
101 |
20 |
41 |
61 |
81 |
102 |
122 |
pH= 9.0 or pH> 9.0 |
||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
|||||
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
|
<= 0.4 |
18 |
35 |
53 |
70 |
88 |
105 |
0.6 |
18 |
36 |
55 |
73 |
91 |
109 |
0.8 |
19 |
38 |
57 |
75 |
94 |
113 |
1 |
20 |
39 |
59 |
78 |
98 |
117 |
1.2 |
20 |
40 |
60 |
80 |
100 |
120 |
1.4 |
21 |
41 |
62 |
82 |
103 |
123 |
1.6 |
21 |
42 |
63 |
84 |
105 |
126 |
1.8 |
22 |
43 |
65 |
86 |
108 |
129 |
2 |
22 |
44 |
66 |
88 |
110 |
132 |
2.2 |
23 |
45 |
68 |
90 |
113 |
135 |
2.4 |
23 |
46 |
69 |
92 |
115 |
138 |
2.6 |
24 |
47 |
71 |
94 |
118 |
141 |
2.8 |
24 |
48 |
72 |
95 |
119 |
143 |
3 |
24 |
49 |
73 |
97 |
122 |
146 |
[Comment: CT99.9 = CT for 3 log inactivation.]
Table B-6
Required CT For Inactivation Of Giardia Cysts By Free Chlorine At 25° Celsius And Greater
pH<=6 |
pH= 6.5 |
pH= 7.0 |
||||||||||||||||
Chlorine |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
(mg/L) |
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 |
<= 0.4 |
4 |
8 |
12 |
16 |
20 |
24 |
5 |
10 |
15 |
19 |
24 |
29 |
6 |
12 |
18 |
23 |
29 |
35 |
0.6 |
4 |
8 |
13 |
17 |
21 |
25 |
5 |
10 |
15 |
20 |
25 |
30 |
6 |
12 |
18 |
24 |
30 |
36 |
0.8 |
4 |
9 |
13 |
17 |
22 |
26 |
5 |
10 |
16 |
21 |
26 |
31 |
6 |
12 |
19 |
25 |
31 |
37 |
1 |
4 |
9 |
13 |
17 |
22 |
26 |
5 |
10 |
16 |
21 |
26 |
31 |
6 |
12 |
19 |
25 |
31 |
37 |
1.2 |
5 |
9 |
14 |
18 |
23 |
27 |
5 |
11 |
16 |
21 |
27 |
32 |
6 |
13 |
19 |
25 |
32 |
38 |
1.4 |
5 |
9 |
14 |
18 |
23 |
27 |
6 |
11 |
17 |
22 |
28 |
33 |
7 |
13 |
20 |
26 |
33 |
39 |
1.6 |
5 |
9 |
14 |
19 |
23 |
28 |
6 |
11 |
17 |
22 |
28 |
33 |
7 |
13 |
20 |
27 |
33 |
40 |
1.8 |
5 |
10 |
15 |
19 |
24 |
29 |
6 |
11 |
17 |
23 |
28 |
34 |
7 |
14 |
21 |
27 |
34 |
41 |
2 |
5 |
10 |
15 |
19 |
24 |
29 |
6 |
12 |
18 |
23 |
29 |
35 |
7 |
14 |
21 |
27 |
34 |
41 |
2.2 |
5 |
10 |
15 |
20 |
25 |
30 |
6 |
12 |
18 |
23 |
29 |
35 |
7 |
14 |
21 |
28 |
35 |
42 |
2.4 |
5 |
10 |
15 |
20 |
25 |
30 |
6 |
12 |
18 |
24 |
30 |
36 |
7 |
14 |
22 |
29 |
36 |
43 |
2.6 |
5 |
10 |
16 |
21 |
26 |
31 |
6 |
12 |
19 |
25 |
31 |
37 |
7 |
15 |
22 |
29 |
37 |
44 |
2.8 |
5 |
10 |
16 |
21 |
26 |
31 |
6 |
12 |
19 |
25 |
31 |
37 |
8 |
15 |
23 |
30 |
38 |
45 |
3 |
5 |
11 |
16 |
21 |
27 |
32 |
6 |
13 |
19 |
25 |
32 |
38 |
8 |
15 |
23 |
31 |
38 |
46 |
pH= 7.5 |
pH= 8.0 |
pH= 8.5 |
||||||||||||||||
Chlorine |
Log Inactivations |
Log Inactivations |
Log Inactivations |
|||||||||||||||
(mg/L) |
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 |
<= 0.4 |
7 |
14 |
21 |
28 |
35 |
42 |
8 |
17 |
25 |
33 |
42 |
50 |
10 |
20 |
30 |
39 |
49 |
59 |
0.6 |
7 |
14 |
22 |
29 |
36 |
43 |
9 |
17 |
26 |
34 |
43 |
51 |
10 |
20 |
31 |
41 |
51 |
61 |
0.8 |
7 |
15 |
22 |
29 |
37 |
44 |
9 |
18 |
27 |
35 |
44 |
53 |
11 |
21 |
32 |
42 |
53 |
63 |
1 |
8 |
15 |
23 |
30 |
38 |
45 |
9 |
18 |
27 |
36 |
45 |
54 |
11 |
22 |
33 |
43 |
54 |
65 |
1.2 |
8 |
15 |
23 |
31 |
38 |
46 |
9 |
18 |
28 |
37 |
46 |
55 |
11 |
22 |
34 |
45 |
56 |
67 |
1.4 |
8 |
16 |
24 |
31 |
39 |
47 |
10 |
19 |
29 |
38 |
48 |
57 |
12 |
23 |
35 |
46 |
58 |
69 |
1.6 |
8 |
16 |
24 |
32 |
40 |
48 |
10 |
19 |
29 |
39 |
48 |
58 |
12 |
23 |
35 |
47 |
58 |
70 |
1.8 |
8 |
16 |
25 |
33 |
41 |
49 |
10 |
20 |
30 |
40 |
50 |
60 |
12 |
24 |
36 |
48 |
60 |
72 |
2 |
8 |
17 |
25 |
33 |
42 |
50 |
10 |
20 |
31 |
41 |
51 |
61 |
12 |
25 |
37 |
49 |
62 |
74 |
2.2 |
9 |
17 |
26 |
34 |
43 |
51 |
10 |
21 |
31 |
41 |
52 |
62 |
13 |
25 |
38 |
50 |
63 |
75 |
2.4 |
9 |
17 |
26 |
35 |
43 |
52 |
11 |
21 |
32 |
42 |
53 |
63 |
13 |
26 |
39 |
51 |
64 |
77 |
2.6 |
9 |
18 |
27 |
35 |
44 |
53 |
11 |
22 |
33 |
43 |
54 |
65 |
13 |
26 |
39 |
52 |
65 |
78 |
2.8 |
9 |
18 |
27 |
36 |
45 |
54 |
11 |
22 |
33 |
44 |
55 |
66 |
13 |
27 |
40 |
53 |
67 |
80 |
3 |
9 |
18 |
28 |
37 |
46 |
55 |
11 |
22 |
34 |
45 |
56 |
67 |
14 |
27 |
41 |
54 |
68 |
81 |
pH= 9.0 or pH> 9.0 |
||||||
Chlorine Concentration (mg/L) |
Log Inactivations |
|||||
0.5 |
1.0 |
1.5 |
2.0 |
2.5 |
3.0 |
|
<= 0.4 |
12 |
23 |
35 |
47 |
58 |
70 |
0.6 |
12 |
24 |
37 |
49 |
61 |
73 |
0.8 |
13 |
25 |
38 |
50 |
63 |
75 |
1 |
13 |
26 |
39 |
52 |
65 |
78 |
1.2 |
13 |
27 |
40 |
53 |
67 |
80 |
1.4 |
14 |
27 |
41 |
55 |
68 |
82 |
1.6 |
14 |
28 |
42 |
56 |
70 |
84 |
1.8 |
14 |
29 |
43 |
57 |
72 |
86 |
2 |
15 |
29 |
44 |
59 |
73 |
88 |
2.2 |
15 |
30 |
45 |
60 |
75 |
90 |
2.4 |
15 |
31 |
46 |
61 |
77 |
92 |
2.6 |
16 |
31 |
47 |
63 |
78 |
94 |
2.8 |
16 |
32 |
48 |
64 |
80 |
96 |
3 |
16 |
32 |
49 |
65 |
81 |
97 |
[Comment: CT99.9 = CT for 3 log inactivation.]
Table B-7
Required CT For Inactivation of Viruses by Free Chlorine
····························· Log Inactivation ····························· |
||||||
2.0 Log |
3.0 Log |
4.0 Log |
||||
Temperature (Celsius) |
pH 6-9 |
pH 10 |
pH 6-9 |
pH 10 |
pH 6-9 |
pH 10 |
0.5 |
6 |
45 |
9 |
66 |
12 |
90 |
5 |
4 |
30 |
6 |
44 |
8 |
60 |
10 |
3 |
22 |
4 |
33 |
6 |
45 |
15 |
2 |
15 |
3 |
22 |
4 |
30 |
20 |
1 |
11 |
2 |
16 |
3 |
22 |
25 |
1 |
7 |
1 |
11 |
2 |
15 |
Table B-8
CT Values for Inactivation of Giardia Cysts by Chlorine Dioxide pH 6-9
···························· Temperature (Celsius) ··························· |
||||||
Log Inactivation |
<=1 |
5 |
10 |
15 |
20 |
>=25 |
0.5 |
10 |
4.3 |
4 |
3.2 |
2.5 |
2 |
1 |
21 |
8.7 |
7.7 |
6.3 |
5 |
3.7 |
1.5 |
32 |
13 |
12 |
10 |
7.5 |
5.5 |
2 |
42 |
17 |
15 |
13 |
10 |
7.3 |
2.5 |
52 |
22 |
19 |
16 |
13 |
9 |
3 |
63 |
26 |
23 |
19 |
15 |
11 |
Table B-9
CT Values for Inactivation of Viruses
By Chlorine Dioxide pH 6-9
··························· Temperature (Celsius) ···························· |
||||||
Log Inactivation |
<=1 |
5 |
10 |
15 |
20 |
>=25 |
2 |
8.4 |
5.6 |
4.2 |
2.8 |
2.1 |
1.4 |
3 |
25.6 |
17.1 |
12.8 |
8.6 |
6.4 |
4.3 |
4 |
50.1 |
33.4 |
25.1 |
16.7 |
12.5 |
8.4 |
Table B-10
CT Values for Inactivation of Giardia Cysts
By Ozone pH 6-9
·························· Temperature (Celsius) ···························· |
||||||
Log Inactivation |
<=1 |
5 |
10 |
15 |
20 |
>=25 |
0.5 |
0.48 |
0.32 |
0.23 |
0.16 |
0.12 |
0.08 |
1 |
0.97 |
0.63 |
0.48 |
0.32 |
0.24 |
0.16 |
1.5 |
1.5 |
0.95 |
0.72 |
0.48 |
0.36 |
0.24 |
2 |
1.9 |
1.3 |
0.95 |
0.63 |
0.48 |
0.32 |
2.5 |
2.4 |
1.6 |
1.2 |
0.79 |
0.60 |
0.40 |
3 |
2.9 |
1.9 |
1.43 |
0.95 |
0.72 |
0.48 |
Table B-11
CT Values for Inactivation of Viruses by Ozone
·························· Temperature (Celsius) ······················· |
||||||
Log Inactivation |
<=1 |
5 |
10 |
15 |
20 |
>= |
2 |
0.9 |
0.6 |
0.5 |
0.3 |
0.25 |
0.15 |
3 |
1.4 |
0.9 |
0.8 |
0.5 |
0.4 |
0.25 |
4 |
1.8 |
1.2 |
1.0 |
0.6 |
0.5 |
0.3 |
Table B-12
Required CT Values for Inactivation of Giardia Cysts by Chloramine, pH 6.0 - 9.0 |
|||||||||||||||||||||||||
Temperature (Celsius) |
|||||||||||||||||||||||||
Log Inactivation |
<=1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
0.5 |
635 |
568 |
500 |
433 |
365 |
354 |
343 |
332 |
321 |
310 |
298 |
286 |
274 |
262 |
250 |
237 |
224 |
211 |
198 |
185 |
173 |
161 |
149 |
137 |
125 |
1 |
1270 |
1136 |
1003 |
869 |
735 |
711 |
687 |
663 |
639 |
615 |
592 |
569 |
546 |
523 |
500 |
474 |
448 |
422 |
396 |
370 |
346 |
322 |
298 |
274 |
250 |
1.5 |
1900 |
1700 |
1500 |
1300 |
1100 |
1066 |
1032 |
998 |
964 |
930 |
894 |
858 |
822 |
786 |
750 |
710 |
670 |
630 |
590 |
550 |
515 |
480 |
445 |
410 |
375 |
2 |
2535 |
2269 |
2003 |
1736 |
1470 |
1422 |
1374 |
1326 |
1278 |
1230 |
1184 |
1138 |
1092 |
1046 |
1000 |
947 |
894 |
841 |
788 |
735 |
688 |
641 |
594 |
547 |
500 |
2.5 |
3170 |
2835 |
2500 |
2165 |
1830 |
1772 |
1714 |
1656 |
1598 |
1540 |
1482 |
1424 |
1366 |
1308 |
1250 |
1183 |
1116 |
1049 |
982 |
915 |
857 |
799 |
741 |
683 |
625 |
3 |
3800 |
3400 |
3000 |
2600 |
2200 |
2130 |
2060 |
1990 |
1920 |
1850 |
1780 |
1710 |
1640 |
1570 |
1500 |
1420 |
1340 |
1260 |
1180 |
1100 |
1030 |
960 |
890 |
820 |
750 |
Table B-13
Required CT for Inactivation of Viruses by Chloramine1 |
|||||||||||||||||||||||||
Temperature (Celsius) |
|||||||||||||||||||||||||
Log Inactivation |
<=1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
2 |
1243 |
1147 |
1050 |
954 |
857 |
814 |
771 |
729 |
686 |
643 |
600 |
557 |
514 |
471 |
428 |
407 |
385 |
364 |
342 |
321 |
300 |
278 |
257 |
235 |
214 |
3 |
2063 |
1903 |
1743 |
1583 |
1423 |
1352 |
1281 |
1209 |
1138 |
1067 |
996 |
925 |
854 |
783 |
712 |
676 |
641 |
605 |
570 |
534 |
498 |
463 |
427 |
392 |
356 |
4 |
2883 |
2659 |
2436 |
2212 |
1988 |
1889 |
1789 |
1690 |
1590 |
1491 |
1392 |
1292 |
1193 |
1093 |
994 |
944 |
895 |
845 |
796 |
746 |
696 |
646 |
597 |
547 |
497 |
1These required CT may be assumed to achieve greater than 99.99 per cent inactivation of viruses only if chlorine is added and mixed in the water prior to the addition of ammonia. If this condition is not met, the public water system must demonstrate, based on onsite studies or other information, as approved by the director, that the public water system is achieving at least 99.99 per cent inactivation of viruses.
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Notes
Promulgated Under: 119.03
Statutory Authority: 6109.04
Rule Amplifies: 6109.03, 6109.04
Prior Effective Dates: 01/01/2005, 01/08/2010, 10/31/2010, 10/05/2013
State regulations are updated quarterly; we currently have two versions available. Below is a comparison between our most recent version and the prior quarterly release. More comparison features will be added as we have more versions to compare.