Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Investigation of impact of split treatment on finished water quality for the Ames water treatment plant
https://orcid.org/0009-0002-0767-0552
https://orcid.org/0000-0003-3195-1039
AbstractIn response to limited carbon dioxide availability and increasing costs during the COVID‐19 pandemic, an investigation into split treatment was performed. A 2020 pilot study showed that a 5% raw water bypass and target caustic alkalinity range of 26–36 mg/L as CaCO3 resulted in 25% and 7% carbon dioxide and lime savings, respectively. Considering this promising outcome, the potential for scaling and corrosion within the plant was evaluated during a subsequent split treatment trial in this study. Mild steel scale coupons were assessed for scaling and corrosion at four different treatment conditions. These results found that a 5% raw water bypass is predicted to have a minimal impact of scaling and corrosion on the water plant infrastructure when compared to full lime softening. Results are significant since split treatment can save over $150,000 annually with no apparent change in water quality, improving the plant's resilience and sustainability.Practitioner Points A 5% raw water bypass produced scale and corrosion similar to full lime softening. Localized build‐up results in surface corrosion. Relocation of SHMP did not show appreciable sequestration of hardness ions. Adjusting dosage and/or using a polyphosphate blend is recommended. A 5% raw water bypass can be implemented at a lime softening facility to reduce chemical usage and cost. A similar procedure can be conducted to analyze the impacts of a larger percent bypass for additional chemical savings.
Investigation of impact of split treatment on finished water quality for the Ames water treatment plant
https://orcid.org/0009-0002-0767-0552
https://orcid.org/0000-0003-3195-1039
AbstractIn response to limited carbon dioxide availability and increasing costs during the COVID‐19 pandemic, an investigation into split treatment was performed. A 2020 pilot study showed that a 5% raw water bypass and target caustic alkalinity range of 26–36 mg/L as CaCO3 resulted in 25% and 7% carbon dioxide and lime savings, respectively. Considering this promising outcome, the potential for scaling and corrosion within the plant was evaluated during a subsequent split treatment trial in this study. Mild steel scale coupons were assessed for scaling and corrosion at four different treatment conditions. These results found that a 5% raw water bypass is predicted to have a minimal impact of scaling and corrosion on the water plant infrastructure when compared to full lime softening. Results are significant since split treatment can save over $150,000 annually with no apparent change in water quality, improving the plant's resilience and sustainability.Practitioner Points A 5% raw water bypass produced scale and corrosion similar to full lime softening. Localized build‐up results in surface corrosion. Relocation of SHMP did not show appreciable sequestration of hardness ions. Adjusting dosage and/or using a polyphosphate blend is recommended. A 5% raw water bypass can be implemented at a lime softening facility to reduce chemical usage and cost. A similar procedure can be conducted to analyze the impacts of a larger percent bypass for additional chemical savings.
Investigation of impact of split treatment on finished water quality for the Ames water treatment plant
https://orcid.org/0009-0002-0767-0552
https://orcid.org/0000-0003-3195-1039
AbstractIn response to limited carbon dioxide availability and increasing costs during the COVID‐19 pandemic, an investigation into split treatment was performed. A 2020 pilot study showed that a 5% raw water bypass and target caustic alkalinity range of 26–36 mg/L as CaCO3 resulted in 25% and 7% carbon dioxide and lime savings, respectively. Considering this promising outcome, the potential for scaling and corrosion within the plant was evaluated during a subsequent split treatment trial in this study. Mild steel scale coupons were assessed for scaling and corrosion at four different treatment conditions. These results found that a 5% raw water bypass is predicted to have a minimal impact of scaling and corrosion on the water plant infrastructure when compared to full lime softening. Results are significant since split treatment can save over $150,000 annually with no apparent change in water quality, improving the plant's resilience and sustainability.Practitioner Points A 5% raw water bypass produced scale and corrosion similar to full lime softening. Localized build‐up results in surface corrosion. Relocation of SHMP did not show appreciable sequestration of hardness ions. Adjusting dosage and/or using a polyphosphate blend is recommended. A 5% raw water bypass can be implemented at a lime softening facility to reduce chemical usage and cost. A similar procedure can be conducted to analyze the impacts of a larger percent bypass for additional chemical savings.
Investigation of impact of split treatment on finished water quality for the Ames water treatment plant
Water Environment Research
Martindale, Nicole (Autor:in) / Ellis, Timothy G. (Autor:in) / Jacob, Matthew (Autor:in) / Hammes, Lyle (Autor:in) / Eshelman, Gary (Autor:in)
01.02.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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