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Chemical Treatment


Chemical treatment includes those processes that do not meet the criteria established for other processes involving chemical addition, such as oxidation or disinfection. Chemical treatment includes processes similar to pH adjustment or corrosion inhibitor addition for the control of lead and copper.

For every entry in the chemical treatment category, contaminant influent and effluent concentrations or microbial density and percent removal (or log removal, where applicable) are identified. The scale of the evaluation, as well as the water type, and form of contaminant are not only significant to evaluation of the performance data, but were also determined to likely be available. General water quality parameters, such as pH, temperature, and alkalinity, which are most likely to influence process performance are also provided.

The chemical treatment category is designed for entry of up to three chemicals at one or different locations in the treatment process. Where only one chemical is added, the data fields related to the second and third chemical addition will be blank. It is also assumed pH adjustment might be a part of a general chemical treatment scheme. As such, three pH fields (1st pH, 2nd pH, and 3rd pH) are included. Finally, contact time or reaction time may also play an important role in many chemical treatment processes and 'contact time' fields (1st contact time, 2nd contact time, and 3rd contact time) are provided for each of chemicals that may be added. If the number of treatment chemicals added exceeds three, additional chemical addition (pH, dose, and contact time) are described in the comments field.

Beyond these basic descriptive data, the chemical treatment information provided includes a text summary of the process and identifies any specific water quality or operational parameters that influence process performance.

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