Parameter January February March Quarterly Total April May June Quarterly Total July August September Quarterly Total October November December

Quarterly 

Total YTD Parameter

Coke Content (% 

by wt) 72.80% 72.80% 72.50% 72.50% 72.50% 72.49% 72.44% 72.19% 71.93% 72.24% 72.26% 72.56% 72.43%

Coke Content (% by 

wt)

Coke Sulfur (by 

wt) 0.0187 0.0179 0.0201 0.0219 0.0174 0.0229 0.0204 0.0167 0.0185 0.0249 0.0235 0.0225 0.0204

Coke Sulfur (by 

wt)

Pitch Content (% 

by wt) 27.20% 27.20% 27.50% 27.50% 27.50% 27.51% 27.56% 27.81% 28.07% 27.76% 27.74% 27.44% 27.57%

Pitch Content (% by 

wt)

Pitch Sulfur 

Content (by 

wt.) 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054 0.0054

Pitch Sulfur Content 

(by wt.)

S Generation Rate 

(lb S/lb paste) 0.0151 0.0145 0.0161 0.0174 0.0141 0.0181 0.0163 0.0136 0.0148 0.0195 0.0185 0.0178 0.0163

S Generation Rate (lb 

S/lb paste)

SO2 Generation (lb 

SO2/lb briquettes) 0.0276 0.0266 0.0295 0.0318 0.0258 0.0332 0.0299 0.0249 0.0272 0.0358 0.0339 0.0327 0.0299

SO2 Generation (lb 

SO2/lb paste)

COS Generation 

Rate (lb COS/lb 

paste) 0.0023 0.0022 0.0025 0.0027 0.0022 0.0028 0.0025 0.0021 0.0023 0.0030 0.0028 0.0027 0.0025

COS Generation Rate 

(lb COS/lb paste)

Briquettes Poured 

(MT) 5709.28 5789.29 5185.01 5813.06 5842.27 5483.39 5994.59 5441.66 5641.96 6098.91 4780.23 5625.27 67,405

Unused Carbon 

(MT) 115 115 115 115 115 115 115 115 115 115 115 115 1,380

Briquettes Poured 

(lbs)

Briquettes Poured 

(lbs) 12,333,278 12,509,670 11,177,461 12,562,074 12,626,471 11,835,276 12,962,279 11,743,277 12,184,863 13,192,266 10,285,073 12,148,068 145,560,057

Adujusted Briquette 

Consumption (lbs)

Aluminum 

Production lbs 22,788,067 21,372,680 22,751,230 66,911,977 21,954,647 23,083,976 22,233,849 67,272,472 22,489,075 22,598,080 22,322,503 67,409,658 22,447,905 22,048,037 22,546,552 67,042,494 268,636,601

Aluminum Production 

lbs

Aluminum 

Production Tons 11,394 10,686 11,376 33,456 10,977 11,542 11,117 33,636 11,245 11,299 11,161 33,705 11,224 11,024 11,273 33,521 134,318

Aluminum Production 

Tons

COS Generation 

Rate (lb COS/Ton 

Al) 2.50 2.61 2.43 3.05 2.37 2.96 2.88 2.17 2.49 3.52 2.65 2.96 2.72

COS Generation Rate 

(lb COS/Ton Al)

SO2 Generation (lb 

SO2/Ton Al) 29.90 31.14 28.97 36.44 28.26 35.34 34.42 25.91 29.69 42.04 31.59 35.28 32.41

SO2 Generation (lb 

SO2/Ton Al)

Pot Capture 

Efficiency 93% 93% 93% 93% 93% 93% 93% 93% 93% 93% 93% 93% 93.0%

Pot Capture 

Efficiency

Control Efficiency 

SO2 96% 96% 96% 96% 96% 96% 96% 96% 96% 96% 96% 96% 96.3%

Control Efficiency 

SO2

Overall Control 

SO2 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 90% 89.6% Overall Control SO2

Control Efficiency 

COS 34% 34% 34% 34% 34% 34% 34% 34% 34% 34% 34% 34% 34.2%

Control Efficiency 

COS

Overall Control 

COS 31% 31% 31% 31% 31% 31% 31% 31% 31% 31% 31% 31% 30.6% Overall Control COS

Primary Control 

(lb SO2/ton Al) 1.03 1.07 1.00 1.25 0.97 1.22 1.18 0.89 1.02 1.45 1.09 1.21 1.12

Primary Control (lb 

SO2/ton Al)

Primary Control 

(lb SO2) 11,721 11,452 11,341 13,764 11,223 13,519 13,317 10,073 11,403 16,235 11,984 13,685 149,717

Primary Control (lb 

SO2)

Roof Vent (lb 

SO2/ton Al) 2.09 2.18 2.03 2.55 1.98 2.47 2.41 1.81 2.08 2.94 2.21 2.47 2.27

Roof Vent (lb 

SO2/ton Al)

Roof Vent (lb SO2) 23,844 23,296 23,072 27,999 22,830 27,501 27,091 20,492 23,197 33,027 24,380 27,839 304,568 Roof Vent (lb SO2)

Total SO2 35,565 34,748 34,413 104,726 41,763 34,053 41,019 116,835 40,408 30,565 34,600 105,573 49,262 36,364 41,524 127,151 454,285 Total SO2

Primary Control 

(lb COS/ton Al) 1.53 1.60 1.49 1.87 1.45 1.81 1.76 1.33 1.52 2.16 1.62 1.81 1.66

Primary Control (lb 

COS/ton Al)

Primary Control 

(lb COS) 17,462 17,061 16,897 20,506 16,720 20,141 19,840 15,008 16,989 24,188 17,855 20,388 223,055

Primary Control (lb 

COS)

Roof Vent (lb 

COS/ton Al) 0.18 0.18 0.17 0.21 0.17 0.21 0.20 0.15 0.17 0.25 0.19 0.21 0.19

Roof Vent (lb 

COS/ton Al)

Roof Vent (lb COS) 1,998 1,952 1,933 2,346 1,913 2,304 2,270 1,717 1,943 2,767 2,042 2,332 25,515 Roof Vent (lb COS)

Total COS 19,460 19,013 18,830 57,303 22,852 18,633 22,444 63,929 22,110 16,724 18,932 57,766 26,955 19,897 22,721 69,573 248,571 Total COS

 East Plant - 2008 Sulfur Dioxide and Carbonyl Sulfide Emissions by Month

Pitch sulfur level - used the average for 2008 for each monthly value. In 2008, the briquette consumption was based off the number of paste boxes dumped on the pots as tracked by the carbon process engineer. Unused carbon was subtracted from briquettes 

consumed as it was sent offsite for recycling.

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