Application - Wastewater Chemistries - Disinfection

Most Frequently Asked Questions  


Parameter Purpose of Test Method
Chlorine, Free
Data used to control Chlorine based disinfection processes, required for reporting at POE and in the distribution system, also used in monitoring in the distribution system during flushing and line break maintenance. EPA Primary DW Standard at 4.0 mg/L as CL2. 8021
10231
Chlorine, Total
Data used to control Chlorine based disinfection processes, required for reporting at POE and in the distribution system, also used in monitoring in the distribution system during flushing and line break maintenance. EPA Primary DW Standard at 4.0 mg/L as CL2. 8167
10070
10232
Chlorine,
Total Amperometric Titration
Chlorine is used to disinfect WW plant effluents, prior to discharge to a receiving body. It is normally present as "combined" chlorine (chloramines). Chlorination is generally followed by de-chlorination with sulfer compounds, prior to release fo effluent. Amperometric titration is considered the "reference" method for comparisons

See AutoCAT 9000 Manual

Chlorine, Total ULR Chlorine is used to disinfect WW plant effluents, prior to discharge to a receiving body. It is normally present as "combined" chlorine (chloramines). Chlorination is generally followed by de-chlorination with sulfer compounds, prior to release fo effluent. ULR — This photometric method is EPA approced for ppb level chlorine determination in WW effluent chlorination/dechlorination processes. 10014

Also Consider  


Parameter Purpose of Test Method
Coliforms, Fecal
E.Coli
Monitor and quantify microbial concentrations in the effluent. NPDES reporting requirement for some facilities 8074
Flow Measure standard in-pipe flow rate for NPDES permit requirements and to establish concentrations/total presence of key analytes.  
THM/THMFP Form as unwanted disinfection by-products when organic matter reacts with chlorine (or bromine). Current EPA regulations allow no more than 80 ppb of total THMs in drinking water supplies. 10224
Ozone Control disinfection processes/in-package disinfection Ozone is often used in place of chlorine, to avoid taste issues, etc. 8311