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Mercury Fate and Transport Study at San Jose/Santa Clara WPCP

This study focuses on mercury fate and transport within the San Jose/Santa Clara Water Pollution Control Plant (WPCP). The research design and interim progress report cover Baywide mercury Total Maximum Daily Load (TMDL), characteristics of POTW mercury, methylation processes, discharge permits, workplan details, and treatment process evaluation for reducing methylmercury. Steps to completion include method development, workplan creation, literature review, SAP detailing, sample collection, optimization studies, and final reporting. Sampling plans involve weekly and monthly measurements of various parameters, with Phase 2 including longer-term studies and additional focused investigations. Important findings show high mercury removal efficiencies, absence of methylation evidence, and the importance of considering daily fluctuations in flow rates. Future actions include baseline sampling continuation, results review, collaboration with Water Board, and optimized sampling implementation.

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Mercury Fate and Transport Study at San Jose/Santa Clara WPCP

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  1. Item #4 Hg Fate and Transport Within the San Jose/Santa Clara WPCP: Study Design and Interim Progress Report

  2. Item #4 Why? • Baywide Hg TMDL • Anything Special About POTW Hg? • Do POTWs Methylate Hg? • Where Does the Hg Go? • NPDES Discharge Permit Provision • Workplan (collection and analytical methods, schedule) • Final Report (Hg F&T, Trends, Correlations, EvaluateFeasibility of CH3Hg Reduction Program)

  3. Item #4 Steps to Completion • Method Development • Workplan • Literature Review • Detailed SAP • Phase 1 Sample Collection • Study Optimization • Phase 2 Sampling • Final Report

  4. Method Development

  5. The Treatment Process (simplified)

  6. Treatment Process

  7. Item #4 The Plan Phase 1 Weekly • RS, PE, SS, NE, SE, FI, TFE, FE • Total, Filtered, Total Methyl (Selected Filtered Methyl) • TSS, Chloride, Sulfate, Sulfide • DO, Temp, pH, Conductivity Monthly • As above + Secondary/ Nitrification Quads • Sludge • Seasonal 24 hour sampling Monthly

  8. Item #4 The Plan Phase 2 • Longer term, reduced frequency • Monthly RS, PE, NE, SE, FI, TFE, TFBW, FE • Weekly RS, FE • Special Focused Studies • More sludge? • Composites? • More 24 hour samples? • Other parameters?

  9. TSS (mg/L)

  10. Item #4

  11. Item #4

  12. Item #4 * * * * * Addition of Cl2 or H2O2

  13. Item #4

  14. Item #4

  15. Item #4

  16. SLUDGE!

  17. Item #4

  18. Item #4 Mass Balance?

  19. Item #4 Interim Conclusions • Efficiencies: • HgTOT 99% • Methyl Hg 97% • Dissolved Hg 50% • Removal correlated with solids removal • No evidence of methylation • Flows sufficient to account for removal • Temporal bias (daily fluctuation)

  20. Item #4 Next Steps • Continue baseline Phase II sampling • Independent review of Phase I results • Discuss with Water Board • Optimize sampling to answer questions • Carry out optimized sampling • Final Report 2007

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