Water Treatment Chemical Injection

Rheotherm flow meters and flow switches are used to monitor the addition of various chemicals to municipal and industrial water supplies for treatment and purification. These chemicals are added at low dose rates, and must be continuously monitored to be sure the water is being treated. A typical system configuration is shown in the diagram below.
Chemical Injection Process

The chemicals are added at various stages of the treatment process depending on the source of the water or wastewater and the intended final use. Dosing pumps are used to inject the chemicals into the process at low to very low rates at high pressure.

Some of the chemicals used in water treatment that are being measured with Rheotherm Low Flow Meters include:
• Biocide
• Sodium hypochlorite (NaOCl)
• Liquid Chlorine
• Alum or aluminum sulfate
• Antifoam
• Ferric chloride (FeCl3)
• Hydroflurosilicic acid (HFSA)
• Sodium hydroxide (NaOH)
• Polymer

Several companies and municipalities are using Rheotherm Model 210  flow meters to measure the flow of these chemicals which are generally metered at flow rates of approximately 0.2 – 5 gph.

A typical configuration used is a Rheotherm Model 210 with local display readout, 4-20mA analog output, Titanium or Hastelloy C-276 wetted material and stainless steel sensor housing.

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