THM Prevention & DOC Remova Drinking Water - Case Study
Cuf was sole sourced for a drinking water facility as it had unmatched purification performance and was the only viable solution for the trend of stricter regulations for reductions in color, THMs, and liquid waste. Cuf achieves all of these water purification requirements and provides an essentially Zero Liquid Discharge solution. A 1 MGD well has been brought online to reduce the demand on its existing potable well which is declining in capacity. The new well has high THM & HAA formation potential due to its DOC levels and has an amber color (150 cu). Operationally this new well is blended with the existing well which contains 1,000 ppb iron and 480 ppm TDS. The DOC, color and iron all need to be purified (removed) from the source water.
The 1 MGD system was commissioned and brought online October 2015. The two ground waters are gravity fed to thesystem, with the blend ratio and flow rate controlled over the full range to resolve TDS issues. A small amount of common coagulant is dosed at the inlet of thefor DOC coagulation. The DOC coagulation and iron oxidation occurs rapidly in the and is filtered and concentrated in real time. The need and cost of large coagulation basins, mixers, clarifiers and the EDR are eliminated.
The palletized above is the entire water plant and operates on demand r emoving Color, Fe and the majority of DOC which significantly reduces chlorine demand. Accordingly, once the system was brought on-linechlorine addition was reduced by 75%. Reduction in DOC and chlorine residual solves THM & HAA formation problems. Purified water is discharged directly to the clear well