ENERGETIC CONVERSION OF ORGANIC FRACTION OF MUNICIPAL SOLID WASTE BY ANAEROBIC CODIGESTION WITH SEWAGE SLUDGE

The PhD thesis is focused on the creation of an applicative protocol to optimize the WWTP anaerobic digesters up-grade and the project of new ones, basing the design on biochemical process equations rather than on classical empirical methods. To reach this purpose, a complete analysis of the whole anaerobic digestion process is designed, scaling up from micro to macro parameters

UASB anaerobic treatment and OFMSW reutilization: Tolmezzo case potentiality; Tratament anaerobic UASB e ri\ufbs da FORSU: potenzialit\ue2t dal cas di Tumie\ue7

More and more interest is being dedicated to anaerobic processes in the scientific literature; in particular, high velocity reactors, such as the Up-flow Anaerobic Sludge Blanket reactor, are able to reduce the required HRT and to optimize biogas production. This kind of reactors is particularly indicated for high concentrated wastewaters, in which the soluble fraction is prevalent over the suspended one. In this cases, the anaerobic process can achieve high efficiencies, in terms of COD removal, with low energy requirements, if compared to a traditional activated sludge process. This work is focused on Tolmezzo wastewater treatment plant, because it contains a UASB reactor, that is inactive since 2007, and so it is, potentially, a source of clean energy. It is supposed to feed the reactor with the liquid fraction of Organic Fraction of Municipal Solid Waste (OFMSW), separately segregated in the local geographic area, while the solid fraction, residual from the separation process, is suitable to be sent to a composting plant

Pilot plant experience on anaerobic codigestion of source selected OFMSW and sewage sludge

Anaerobic codigestion of source selected organic fraction of municipal solid waste (SS-OFMSW) and sewage sludge may be one of the most viable solutions to optimize oversized digesters efficiency in wastewater treatment plants. Based on results of BMP tests obtained for sewage sludge and SS-OFMSW, pilot plant tests were carried out by 3.4 m3 CSTR reactor at mesophilic temperature. A mix of fruit and vegetable waste from wholesale market and canteen waste was used as SS-OFMSW substrate. Tests were conducted applying an OLR (organic loading rate) ramp with 6 different phases until a value of 3.2 kgVS/m3 d. Feedstock and digestate characteristics, efficiency and process parameters were monitored. The anaerobic codigestion development was stable in each phase: early indicators like VFA (volatile fatty acids) and FOS/TAC ratio were always below instability threshold values. The maximum OLR tested determined a GPR (gas production rate) of 0.95 N m3/m3 d and SGP (specific gas production) of 0.49 N m3/kgVS with a VS abatement of 67.3%. \ua9 2015 Elsevier Ltd