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Phosphates for potable water treatment perform several functions that include: iron and manganese control, scale inhibition and removal, corrosion control and chlorine stabilization.
This research presents results from phosphate dosing experiments using a real scale chlorinated DWDS, comparing standard phosphate concentrations of United Kingdom drinking water (1 mgP/L) with a double dose (2 mgP/L) commonly used in plumbosolvency treatment.
Feedwater dosage is 8.8 ppm to yield 10 ppm free EDTA and 26 ppm polymer. If the hardness goes up to 1 ppm or the product is used in another system where the hardness is 1 ppm, the feedwater dosage increases to 43 ppm to obtain 10 ppm free EDTA. This would yield a high polymer level of 129 ppm.
13 Απρ 2017 · • Phosphates in Water Treatment • Chemical Inhibitors • Dosage Rates • Selection of Phosphates/Benefits of Phosphates • Case Studies • Monitoring Corrosion Control Success
8 Οκτ 2021 · Phosphate is commonly used to minimize corrosion to potable water distribution systems, residential, commercial and industrial potable water piping, and reduce lead corrosion to comply with EPA standards. To achieve passivation of new or previously untreated systems phosphate is typically dosed at >3.0 mg/L as orthophosphate.
The typical maintenance dosage to ensure corrosion control is 0.5-1.5 mg/L as orthophos-phate. Phosphate Treatment Monitoring. Phosphate concentration monitoring is necessary to ensure adequate corrosion control. Manual monitoring is possible, however to avoid under- or overfeed during periods of fluctuating system flows continuous. 1.
Phosphates added in the proper ratio of trisodium and monosodium help buffer pH to keep it between the low pH corrosive range and the high pH scale forming range, as cooling water is concentrated by evaporation. Phosphates also help prevent hard mineral scale from forming on high heat transfer surfaces.
