STP851: Energy Recovery from Agroindustrial Wastes with Prevalently Solute Pollutants Using Fixed-Bed Anaerobic Reactors

    Sanna, P
    Biomass project leader and researcher, ASSORENI, ENI Group Research Association, Laboratori Microbiologici, Rome,

    Camilli, M
    Biomass project leader and researcher, ASSORENI, ENI Group Research Association, Laboratori Microbiologici, Rome,

    Pages: 12    Published: Jan 1984


    Abstract

    A process for anaerobic digestion of agroindustrial wastes containing mainly soluble pollutants has been developed utilizing fixed-bed reactors.

    A pilot plant at a sugar refinery with two reactors in parallel, respectively of 10 and 50 m3 operating volume, has functioned successfully in treating wastes produced in regenerating ion-exchange columns used to purify the sugar juices. With an hydraulic retention time (HRT) of less than one day, a maximum gas production of 11.5 volumes per operating volume of reactor per day was obtained together with a reduction of up to 80% of the biological oxygen demand for five days (BOD5), and volatile solids and up to 70% of the chemical oxygen demand (COD).

    The gas contained from 70 to 75% methane.

    On the basis of these results, a full-scale industrial plant was built which has produced up to 7500 m3 a day of biogas. The process has been found suitable for a large number of industrial wastes, especially when plants are seasonally operated.

    Keywords:

    digestion, anaerobic digestion, anaerobic fermentation, biogas, methane, anaerobic filter, fixed-bed anaerobic reactors, digester, wastewater treatment, agroindustrial wastes, hazardous wastes, industrial wastes


    Paper ID: STP32705S

    Committee/Subcommittee: D34.03

    DOI: 10.1520/STP32705S


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