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Sewage sludge char was activated, using several different methods, to be used for the adsorption of formaldehyde. First, sewage sludge was pyrolyzed at 700 °C for one hour to produce char. The sewage sludge char was then activated with 20% steam gas. To produce a chemically activated char, KOH was used with the char at a weight ratio of KOH/char=0.5. To produce another kind of activated char containing...
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