hg fate and transport within the san jose/santa clara · pdf filesan jose/santa clara wpcp:...
TRANSCRIPT
Hg Fate and Transport Within theHg Fate and Transport Within theSan Jose/Santa Clara WPCP:San Jose/Santa Clara WPCP:
Study Design and PreliminaryStudy Design and PreliminaryResultsResults
Drivers:
• Baywide Hg TMDL1. Anything Special About POTW Hg?2. Do POTWs Methylate Hg?3. Where Does the Hg Go?
• NPDES Discharge Permit Provisiona) Workplan (collection and analytical methods, schedule)b) Final Report (Hg F&T, Trends, Correlations, Evaluate Feasibility of
CH3Hg Reduction Program)
ProgressMethod Development
Workplan
Literature Review
Detailed SAP
Phase 1 Sample Collection
Study Optimization
Phase 2 Sampling
Final Report
The Treatment Process(simplified)
Treatment Process
The PlanPhase 1
Weekly RS, PE, SS, NE, SE, FI, TFE, FE
Total, Filtered, Total Methyl
TSS, Chloride, Sulfate, Sulfide, DO, Temp, pH, Cond.
Monthly As above + Secondary/Nitrification Quads
Sludge
Phase 2 Longer term, reduced frequency
Possible gas sampling
209
9989
8 9 82<1
0
50
100
150
200
250
300
350
RS PE SS N E SE FI TFE FE
TSS(mg/L)
Total Mercury(ng/L) n=16
193.7
89.8100.2
5.7 5.6 5.5 1.7 2.2
0
50
100
150
200
250
300
RS PE SS N E SE FI TFE FE
Total Methylmercury(ng/L)
1.3031.365
1.304
0.045 0.040 0.049 0.027 0.029
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
RS PE SS N E SE FI TFE FE
Secondary Process CH3HgTSS Normalized (n=3)
0.0000
0.0005
0.0010
0.0015
0.0020
0.0025
0.0030
NQ1 NQ2 NQ3 NQ4 SQ1 SQ2 SQ3 SQ4
Dissolved Mercury (ng/L) n=16
2.87
3.55 3.59
0.840.97
1.171.37
1.53
0.0
1.0
2.0
3.0
4.0
5.0
RS PE SS N E SE FI TFE FE
SLUDGE
Sludge Total Mercury(mg/kg dry) n=2
2.08
0.80
0.95
0.77
1.83
1.68
0.00
0.50
1.00
1.50
2.00
2.50
3.00
PS WAS WNS TAS DS SL
Next Steps
• Evaluate Phase 1 Data
• Possibility of gas phase sampling
• Optimize Sampling for Phase 2
• Carry Out Optimized Sampling(seasonal)
• Final Report 2007
• Learn to Surf