Perugia, Italy
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Di Maria F.,LAR Laboratory | Contini S.,LAR Laboratory | Bidini G.,LAR Laboratory | Boncompagni A.,ZENO | And 2 more authors.
Energy Procedia | Year: 2016

The energetic efficiency (EE) of an existing waste to energy plant (WtE) was investigated in the perspective of the waste framework directive 2008/98/EC (WFD). WFD introduced the possibility of considering the WtE a material recovery facility if its EE resulted not lower than 0.6. Currently the analyzed WtE recovers only electrical energy from waste combustion by a steam turbine and showed an EE of about 0.44. This figure can be increased up to 0.6 if the WtE is operated in a combined heat and power mode (CHP). CHP can be realized exploiting a given fraction of the saturated steam generated by the evaporator. In the average operating conditions of the WtE about 2,900 kg/h of steam used for CHP can lead to EE ≥ 0.6. This heat was used for feed and organic Rankyne cycle able to produce up to 250 kW with an average electrical efficiency of about 13%, comparable to the one of the WtE. © 2016 The Authors.


Di Maria F.,LAR Laboratory | Segoloni E.,LAR Laboratory
Waste Management | Year: 2016

The effect of solid anaerobic digestion batch (SADB) on bio-waste performed with and without inoculum on the quality of the final amendment was investigated by means of determining the content of organic carbon, humic and fulvic acids and the degree of humification. Two different processes were compared: composting and SADB with post-composting. Six parallel tests were performed. In three of these tests the SADB was inoculated mixing the bio-waste with the digestate from the previous run in a 1:1 ratio by weight. The amendment obtained by the SADB with post-composting treatment, in which the SADB was not inoculated, had an organic carbon content ranging from 15.5% TS to 30.3% TS resulting from 1% up to 14% higher than that of the corresponding composting processes. Similar results were achieved for the degree of humification. On the other hand SADB in which the inoculum was used generated about 300. NL/kgVS of biogas instead of about 267. NL/kgVS for non-inoculated runs. © 2016 Elsevier Ltd.


PubMed | LAR Laboratory
Type: | Journal: Waste management (New York, N.Y.) | Year: 2016

The effect of solid anaerobic digestion batch (SADB) on bio-waste performed with and without inoculum on the quality of the final amendment was investigated by means of determining the content of organic carbon, humic and fulvic acids and the degree of humification. Two different processes were compared: composting and SADB with post-composting. Six parallel tests were performed. In three of these tests the SADB was inoculated mixing the bio-waste with the digestate from the previous run in a 1:1 ratio by weight. The amendment obtained by the SADB with post-composting treatment, in which the SADB was not inoculated, had an organic carbon content ranging from 15.5% TS to 30.3% TS resulting from 1% up to 14% higher than that of the corresponding composting processes. Similar results were achieved for the degree of humification. On the other hand SADB in which the inoculum was used generated about 300NL/kgVS of biogas instead of about 267NL/kgVS for non-inoculated runs.


Di Maria F.,LAR Laboratory | Micale C.,LAR Laboratory | Morettini E.,LAR Laboratory | Sisani L.,TSA spa | Damiano R.,GESENU spa
Waste Management | Year: 2015

Starting from an existing waste management district without thermal treatment facilities, two different management scenarios for residual waste were compared by life cycle assessment (LCA). The adoption of a bioreactor landfill for managing the mechanically sorted organic fraction instead of bio-stabilization led to reduction of global warming and fresh water eutrophication by 50% and 10%, respectively. Extraction of recyclables from residual waste led to avoided emissions for particulate matter, acidification and resource depletion impact categories. Marginal energy and the amount of energy recovered from landfill gas marginally affected the LCA results. On the contrary the quality of the recyclables extracted can significantly modify the eco profile of the management schemes. © 2015 Elsevier Ltd.


The effects of anaerobic co-digestion of waste-mixed sludge with fruit and vegetable waste (FVW) on the methane generation of a mesophilic digester was investigated. Organic loading rates (OLR) were 1.46kgVS/m3day, 2.1kgVS/m3day and 2.8kgVS/m3day. Increase in the OLR due to FVW co-digestion caused modification of the internal environment of the digester, mainly in terms of N-NH4 (mg/L). Corresponding microbial populations were investigated by metagenomic high-throughput sequencing. Maximum specific bio-methane generation of 435 NLCH4 per kgVS feed was achieved for an OLR of 2.1kgVS/m3day, which corresponded to a biomethane generation per kgVS removed of about 1700 NLCH4. In these conditions the methanogenic pathway was dominated by aceticlastic Methanosaeta and hydrogenotrophic/aceticlastic Methanoscarcinae. Ammonia concentration in the digester resulted a key parameter for enhancing syntrophic acetate oxidation, enabling a balanced aceticlastic and hydrogenotrophic/aceticlastic methanogenic pathway. © 2015 Elsevier Ltd.

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