title: Development of an efficient process for the treatment of residual sludge discharged from an anaerobic digester in a sewage treatment plant.
abstract: In order to reduce the discharge of residual sludge from an anaerobic digester, pre-treatment methods including low-pressure wet-oxidation, Fenton oxidation, alkali treatment, ozone oxidation, mechanical destruction and enzymatic treatment were evaluated and compared. VSS removal efficiencies of greater than 50% were achieved in cases of low-pressure wet-oxidation, Fenton oxidation and alkali treatment. Residual sludge from an anaerobic digester was pre-treated and subjected to thermophilic anaerobic digestion. As a result, the process of low-pressure wet-oxidation followed by anaerobic digestion achieved the highest VSS removal efficiency of 83%. The total efficiency of VSS removal of sewage sludge consisting of primary and surplus sludge would be approximately 92%, assuming that the VSS removal efficiency of sewage sludge is 50% in the anaerobic digester of the sewage treatment plant.
authors.affiliation: Hitachi Plant Technologies Ltd., 5-2 Higashi-Ikebukuro 4-Chome, Toshima-ku, Tokyo 170-8466, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Abe
authors.forename: Yue-Qin
authors.initials: YQ
authors.lastname: Tang
authors.forename: Makoto
authors.initials: M
authors.lastname: Iwamura
authors.forename: Hiroto
authors.initials: H
authors.lastname: Ohta
authors.forename: Shigeru
authors.initials: S
authors.lastname: Morimura
authors.forename: Kenji
authors.initials: K
authors.lastname: Kida
mesh_terms: D000693:Anaerobiosis; D010084:Oxidation-Reduction; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage
chemical_list: D012722:Sewage