copper presentation
TRANSCRIPT
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Copper Removal
Cost effective treatment of distillery effluent to remove copper
Presented by Dr Stephen Walker
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Copper Reduction Tests
reduction in Copper above 90%
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Copper Reduction
Average start figure
4.00mg/l
After treatment
0.58mg/l
Percentage
reduction
85%
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Relationship between pH increase and Copper Reduction
pH at Start Copper at Start pH at end Copper at end
9.0 12.0mg/l 8.3 2.6mg/l
9.5 12.0mg/l 8.7 2.9mg/l
10.0 12.2mg/l 9.1 3.0mg/l
10.5 12.2mg/l 9.6 3.5mg/l
11.0 12.2mg/l 10.2 4.7mg/l
11.5 12.1mg/l 10.6 6.7mg/l
12.0 12.1mg/l 11.1 7.6mg/l
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0
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0 1 2 3 4 5 6 7 8
pH at StartCopper at Start (mg/l)pH at endCopper at end (mg/l)
pH
Mg/l of Copper
Relationship between pH increase and Copper Reduction
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Affect on Copper using Chemical/Physical Treatment System
Copper Before Copper After Percentage (%)
Treatment Treatment Reduction
pH Adjusted to 8.3
12.0mg/l 2.6mg/l 79%
11.5mg/l 2.8mg/l 75%
18.0mg/l 4.0mg/l 78%
11.8mg/l 2.8mg/l 76%
12.2mg/l 3.0mg/l 75%
Average Percentage (%) Reduction in Total Copper = 76.6%
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Affect on Chemical Oxygen Demand (COD) using Chemical /
Physical Treatment Process
Pre DAF COD Post DAF COD Percentage (%)
Reduction
6,440mg/l 4,166mg/l 35%
4,885mg/l 3,504mg/l 28%
5,240mg/l 3,855mg/l 28%
4,020mg/l 2,811mg/l 28%
5,700mg/l 4,072mg/l 30%
Average Percentage (%) reduction in COD = 30%
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Effect on Suspended Solids (SS) Using Chemical/Physical
Treatment Process
Before Treatment Post Treatment Percentage (%)
Reduction
2210mg/l 880mg/l 70%
1350mg/l 460mg/l 66%
1350mg/l 440mg/l 67%
550mg/l 180mg/l 67%
1520mg/l 460mg/l 70%
Average Percentage (%) Reduction in Suspended Solids (SS) = 67%
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Adjusting pH using Hydrochloric Acid to improve Copper removal
Initial pH Initial Copper Adjusted pH Final Copper
12.0 12.2mg/l 8.3 3.0mg/l
11.5 12.1mg/l 8.5 2.8mg/l
11.0 11.7mg/l 8.5 2.6mg/l
10.5 11.7mg/l 8.3 2.4mg/l
10.0 10.6mg/l 8.9 4.2mg/l
Note at pH 10 no additional acid used for this test
9.5 7.6mg/l 8.6 3.1mg/l
As at pH 10 no need to adjust with acid, chemical programme adequate
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