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The cost of acid-washed bituminous coal activated carbon and unwashed coconut shell activated carbon was used for this comparison. Acid-washed was selected because unwashed bituminous coal carbon has ash or impurity levels three times higher, compared to unwashed coconut shell carbon.
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The above pyrolysis/activation conditions result in an estimated final yield of 21.6% activated carbon on a dry weight basis. Costs were developed assuming a daily input of 20 t of broiler litter, which results in a daily production rate of 4.32 t of activated carbon.
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