title: Anaerobic thermophilic digestion of sewage sludge with a thickened sludge recycle.
abstract: The process of anaerobic thermophilic digestion of municipal wastewater sludge with a recycled part of thickened digested sludge, was studied in semi-continuous laboratory digesters. This modified recycling process resulted in increased solids retention time (SRT) with the same hydraulic retention time (HRT) as compared with traditional digestion without recycling. Increased SRT without increasing of HRT resulted in the enhancement of volatile substance reduction by up to 68% in the reactor with the recycling process compared with 34% in a control conventional reactor. Biogas production was intensified from 0.3 L/g of influent volatile solids (VS) in the control reactor up to 0.35 L/g VS. In addition, the recycling process improved the dewatering properties of digested sludge.
authors.affiliation: MGUP 'Mosvodokanal', 1-st Kuryanovsky pr., 15, Moscow, Russia. a_vanyushina@yahoo.com
authors.forename: A Ya
authors.initials: AY
authors.lastname: Vanyushina
authors.forename: Yu A
authors.initials: YA
authors.lastname: Nikolaev
authors.forename: A M
authors.initials: AM
authors.lastname: Agarev
authors.forename: M V
authors.initials: MV
authors.lastname: Kevbrina
authors.forename: M N
authors.initials: MN
authors.lastname: Kozlov
mesh_terms: D000693:Anaerobiosis; D001421:Bacteria, Anaerobic; D019149:Bioreactors; D005160:Facility Design and Construction; D006358:Hot Temperature; D008697:Methane / Q000737:chemistry / Q000378:metabolism; D012722:Sewage; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000191:economics / Q000379:methods*; D014867:Water / Q000737:chemistry
chemical_list: D012722:Sewage; D014867:Water; D008697:Methane