Stimulation of Anaerobic Digestion of Thickened Sewage Sludge by Iron-rich Sludge Produced by the Fenton Method

摘要

In batch mesophilic anaerobic digestion of a mixture of iron-rich sludge collected from Fenton treatment of molasses wastewater(MWW)and thickened sewage sludge from a municipal wastewater treatment plant,the methane content in the gas from the mixture was significantly higher than that from thickened sewage sludge only.When minerals in iron-rich sludge obtained by incineration were fed to thickened sewage sludge in semi-continuous experiments,the methane content obtained by digestion of thickened sewage sludge only increased approximately from 53% to 64%.These results suggest that iron-rich sludge can enhance methane production for thickened sewage sludge.