Optimization of metal leaching efficiency of fly ash from municipal solid waste incineration by sulfur oxidzing bacteria

摘要

Sulfur oxidizing bacteria were used to leach metals bound in municipal solid waste incineration fly ash. Pure or mixed cultures of Thiobacilli with or without addition of anoxic sewage sludge were incubated with various amounts of fly ash for several weeks. Co-cultures with Thiobacilli and sewage sludge grew faster than pure cultures of T.thiooxidans or cultures with only sewage sludge as inoculum. The addition of sewage sludge increased the growth of sulfur oxidizing bacteria and simultaneously enhanced the acidification of the suspension. As a result, the time for fly ash processing was reduced by 50