Notice of RetractionMesophilic anaerobic digestion of thermal-hydrolyzed sewage sludge

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

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The characteristics of mesophilic anaerobic sequencing batch reactor (ASBR) treating thermal-hydrolyzed sewage sludge were investigated. The results showed that increasing the OLR_COD of the mesophilic ASBR treating thermal-hydrolyzed sewage sludge from 7.762kg/(m³·d) to 13.l06kg/(m³·d) lead to the “acidification” of the reactor with the accumulation of the volatile fatty acid (VFA) and the drop of the pH and gas production. This acidification is recoverability. The OLR_COD of the mesophilic ASBR treating thermal-hydrolyzed sewage sludge can reach to 10kg/(m³·d) after the system was recovered. Under the OLR_COD of 2.523, 4.196, 7.762 and 10.091kg/(m³·d), the methane yield (CH₄/COD_input) of mesophilic ASBR were 266, 277, 229 and 204mL respectively. There are significant linear relationship between OLR and MPR. With the increase of the OLR, the methane production rate increased. The mean cell retention times of the mesophilic ASBR were 2.16 to 2.40 times of the hydraulic retention time.