Disinfectant contact time
Term · Environment · MLC-T-ENV-008163
1. "T" in CT calculations
2. The time in minutes that it takes for water to move from the point of disinfectant application or the previous point of disinfectant residual measurement to a point before or at the point where residual disinfectant concentration (C) Is measured. Where only one C is measured, T is the time in minutes that it takes for water to move from the point of disinfectant application to a point before or at where residual disinfectant concentration (C) is measured. Where more than one C is measured, T is (a) for the first measurement of C, the time in minutes that it takes for water to move from the first or only point of disinfectant application to a point before or at the point where the first C+ is measured and (b) for subsequent measurements of C, the time in minutes that it takes for water to move from the previous C measurement point to the C measurement point for which the particular T is being calculated-. Disinfectant contact time in pipelines must be calculated based on plug flow by dividing the internal volume of the pipe by the maximum hourly flow rate through that pipe. Disinfectant contact time within mixing basins and storage reservoirs must be determined by tracer studies or an equivalent demonstration.
3. Time in minutes that it takes for water to move from the point of disinfectant application or the previous point of disinfectant residual measurement to a point before or at the point where residual disinfectant concentration (‘‘C’’) is measured. Where only one ‘‘C’’ is measured, ‘‘T’’ is the time in minutes that it takes for water to move from the point of disinfectant application to a point before or at where residual disinfectant concentration (‘‘C’’) is measured.
| Identifier | MLC-T-ENV-008163 |
|---|---|
| Field | Environment |
| Subject | Water |
| References | Drinking Water Technical & Legal Terms; Definition truncated. For full definition, see 40 CFR 141.2 (CFR 2018) |
Record as JSON
{
"id": "MLC-T-ENV-008163",
"term": "Disinfectant contact time",
"field": "Environment",
"term_source": "Disinfectant Contact Time",
"definition": "1. \"T\" in CT calculations\n\n2. The time in minutes that it takes for water to move from the point of disinfectant application or the previous point of disinfectant residual measurement to a point before or at the point where residual disinfectant concentration (C) Is measured. Where only one C is measured, T is the time in minutes that it takes for water to move from the point of disinfectant application to a point before or at where residual disinfectant concentration (C) is measured. Where more than one C is measured, T is (a) for the first measurement of C, the time in minutes that it takes for water to move from the first or only point of disinfectant application to a point before or at the point where the first C+ is measured and (b) for subsequent measurements of C, the time in minutes that it takes for water to move from the previous C measurement point to the C measurement point for which the particular T is being calculated-. Disinfectant contact time in pipelines must be calculated based on plug flow by dividing the internal volume of the pipe by the maximum hourly flow rate through that pipe. Disinfectant contact time within mixing basins and storage reservoirs must be determined by tracer studies or an equivalent demonstration.\n\n3. Time in minutes that it takes for water to move from the point of disinfectant application or the previous point of disinfectant residual measurement to a point before or at the point where residual disinfectant concentration (‘‘C’’) is measured. Where only one ‘‘C’’ is measured, ‘‘T’’ is the time in minutes that it takes for water to move from the point of disinfectant application to a point before or at where residual disinfectant concentration (‘‘C’’) is measured.",
"subject": "Water",
"references": [
"Drinking Water Technical & Legal Terms",
"Definition truncated. For full definition, see 40 CFR 141.2 (CFR 2018)"
],
"url": "https://mlchart.com/terminology/environment/disinfectant-contact-time/"
}
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