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Co-treatment of fruit and vegetable waste in sludge digesters. An analysis of the relationship among bio-methane generation, process stability and digestate phytotoxicity

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Sep 2014 Italy Publisher:Elsevier BVJournal:Waste Management, volume 34, pages 1,603-1,608 (issn: 0956-053X,

Authors: DI MARIA, Francesco; A. Sordi; G. Cirulli; GIGLIOTTI, Giovanni; MASSACCESI, LUISA; CUCINA, MIRKO;

doi: 10.1016/j.wasman.2014.05.017

pmid: 24917367

handle: 20.500.14243/413597 , 11391/1228077

Co-treatment of fruit and vegetable waste in sludge digesters. An analysis of the relationship among bio-methane generation, process stability and digestate phytotoxicity

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Abstract

The co-digestion of a variable amount of fruit and vegetable waste in a waste mixed sludge digester was investigated using a pilot scale apparatus. The organic loading rate (OLR) was increased from 1.46 kg VS/m(3) day to 2.8 kg VS/m(3) day. The hydraulic retention time was reduced from 14 days to about 10 days. Specific bio-methane production increased from about 90 NL/kg VS to the maximum value of about 430 NL/kg VS when OLR was increased from 1.46 kg VS/m(3) day to 2.1 kg VS/m(3) day. A higher OLR caused an excessive reduction in the hydraulic retention time, enhancing microorganism wash out. Process stability evaluated by the total volatile fatty acids concentration (mg/l) to the alkalinity buffer capacity (eq. mg/l CaCO3) ratio (i.e. FOS/TAC) criterion was 2.46 kg VS/m(3) day, GI decreased rapidly. This corresponding trend between FOS/TAC and GI was further investigated by the definition of the GI ratio (GIR) parameter. Comparison between GIR and FOS/TAC suggests that GI could be a suitable criterion for evaluating process stability.

Country

Italy

Related Organizations

National Research Council
Italy
University of Perugia
Italy

Keywords

Waste Products, Germination, Garbage, Lepidium sativum, Fruit and vegetable waste, Bioreactors, Waste Management, Anaerobic co-digestion, FOS/TAC, Germination index, Toxicity Tests, Waste mixed sludge, Anaerobic co-digestion; Biomethane; FOS/TAC; Germination Index; Fruit and Vegetable Waste; Organic loading rate; Waste mixed sludge, Methane, Organic loading rate, Biomethane

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	citations This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).	102
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