Grambach, Austria
Grambach, Austria

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Resch C.,Rainbows informationsmanagement gmbh | Worl A.,University of Natural Resources and Life Sciences, Vienna | Waltenberger R.,University of Natural Resources and Life Sciences, Vienna | Braun R.,University of Natural Resources and Life Sciences, Vienna | Kirchmayr R.,Enbasys GmbH
Bioresource Technology | Year: 2011

This study focuses on the enhancement of an Austrian anaerobic digestion plant at a slaughterhouse site which exclusively uses animal by-products as substrate. High ammonia concentrations from protein degradation cause severe inhibitions of anaerobic microorganisms. For improving the current situation the COD:TKN ratio is widened by (a) ammonia stripping directly out of the process and (b) addition of a C source to the substrate. Different OLR and HRT were tested in continuous experiments to simulate new operating conditions. The results show that the addition of carbon cannot improve fermentation capacity. The reduction of ammonia boosts the degradation: After reduction of TKN from 7.5 to 4.0gkg-1 the initially high VFA concentration decreased and the COD degradation was improved by 55.5%. Hence, the implementation of the new N reduction process facilitates either the increase of the OLR by 61% or the reduction of the HRT by 25%. © 2010 Elsevier Ltd.

Drosg B.,University of Natural Resources and Life Sciences, Vienna | Fuchs W.,University of Natural Resources and Life Sciences, Vienna | Meixner K.,University of Natural Resources and Life Sciences, Vienna | Waltenberger R.,Enbasys GmbH | And 3 more authors.
Water Science and Technology | Year: 2013

Stillage processing can require more than one third of the thermal energy demand of a dry-grind bioethanol production plant. Therefore, for every stillage fraction occurring in stillage processing the potential of energy recovery by anaerobic digestion (AD) was estimated. In the case of whole stillage up to 128% of the thermal energy demand in the process can be provided, so even an energetically self-sufficient bioethanol production process is possible. For wet cake the recovery potential of thermal energy is 57%, for thin stillage 41%, for syrup 40% and for the evaporation condensate 2.5%. Specific issues for establishing AD of stillage fractions are evaluated in detail; these are high nitrogen concentrations, digestate treatment and trace element supply. If animal feed is co-produced at the bioethanol plant and digestate fractions are to be reused as process water, a sufficient quality is necessary. Most interesting stillage fractions as substrates for AD are whole stillage, thin stillage and the evaporation condensate. For these fractions process details are presented. © IWA Publishing 2013.

Aichberger G.,Enbasys GmbH | Ruhmer K.,Enbasys GmbH
BioCycle | Year: 2010

A large-scale organic waste processing facility in Venice, Italy, combines the core concepts of a continuous stirred reactor and an upflow anaerobic sludge blanket to process about 105,000 metric tons/year. The facility receives 300,000 metric tons of organic waste from a densely populated area and over half of the waste goes directly to composting. About 140,000 metric tons of the waste is processed by the enbasys BioGas process line and digester system, a High Load Hybrid Reactor technology (ENBAFERM). The system automatically regulates its feed-in and pumping rates based on composition of the loads coming in. The produced biogas, 1450 N m3/h, is used to run a combined heat and power (CHP) plant rated at approximately 3.4 MW. Thermal energy generated by the co-generation units is utilized within the facility and for the local district heating system.

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