Status and new trends / perspectives of MBT in Germany
© Wasteconsult international (5/2015)
Waste treatment management needs to realign specifications of sustainability of resources. According to present studies, waste treatment management is significantly able to contribute to material and energy recovery from solid waste. In Europe, implementation of the European Waste Framework Directive leads to changing solid waste arisings with regard to amount, quality and disposition. Meanwhile, significant over-capacities of solid waste treatment are present in the german solid waste market. Contradictorily, solid waste arisings are expected to remain static or even decrease against the background of Germany by the Closed Substance Cycle Waste Management Act (KrWG) which will lead to increasing recyclable fractions as well as increasing biowaste. Solid waste which is imported from other European countries currently balances this effect insignificantly.

Experimental check of digestate processing via vermicomposting
© Wasteconsult international (5/2015)
The article examines potential processing of digestate via vermicomposting. The experiments focused on the assessment of the properties of vermicomposts produced from conventional biowastes and biowastes with added digestate. The properties of vermicomposts were examined by means of pot vegetation experiments, agro chemicalanalyses of the growth substrate and of the grown plant mass. The test confirmed that the application of vermicompost with added digestate had a positive effect on the nutrient intake by plants as well as on the quality of the growth substrate. Moreover, there were interesting differences in the contents of hazardous elements. For example, the content of lead analyzed in the substrate made from vermicompost and added digestate was 17.07 mg/kg, whereas in the substrate made from vermicompost only lead amounted to 24.49 mg/kg. In searching for various methods how to process digestate, vermicomposting appears as a feasible Option.

Operation experiences at the MBT Maresme, the latest wet anaerobic digestion plant for MSW built in Spain
© Wasteconsult international (5/2015)
The MBT Maresme is the latest wet anaerobic digestion plant for the Organic Fraction from Municipal Solid Waste (MOR -Materia Orgánica Residual), that has been built in Spain, in countercurrent to the observed development towards MBT plants with only composting technology. In the present paper a short presentation of the MBT Maresme is given before the operation experiences during the start-up phase and the guarantee tests are discussed. Despite the challenge the operation of this facility under aggravating circumstances implied, the achieved performance and clearly advantageous energetic balance confirm the integration of a digestion step in MBT plants as a valid and valuable concept.

Liquid Digestate-free Anaerobic Digestion with the HZI-KOMPOGAS® plug flow digester
© Wasteconsult international (5/2015)
The KOMPOGAS® plug flow fermentation is a highly efficient process for generate energy from waste. The digestate from the fermentation has in this case due to the System to a water content between 70 and 75 percent. Due to its high content of nutrient salts press water can generally be used without further purification as liquid manure in agriculture. In many regions or even countries, there is due to intensive livestock farming, already a large oversupply of liquid manures or spreading is not allowed by law. Also the logistic could be difficult and expensive.

Compost-like material or thermal valorization – impact on MBT Plant economics and environmental aspects – Case studies in Portugal and UK
© Wasteconsult international (5/2015)
The paper focuses on the utilisation of the solid product from the biological Treatment stages of three MBT Plants which treat the organic fraction of MSW by means of wet mechanical pre-treatment units followed by anaerobic digestion. The experiences of two MBT Plants in Portugal (CVO Valorlis and CVO Suldouro) which produce compost-like material are contrasted with the experiences at the MBT Bredbury Parkway (UK) which, by drying the digested solids, produces a RDF with low calorific value for further use in thermal valorisation. The impact of these two different approaches on the operating costs for the treatment of the digested solids as well as the environmental aspects for both valorization paths is discussed.

Peripheral fermentation of organic waste – Insights and data from practice
© Wasteconsult international (5/2015)
The fermentation of organic waste is a valuable source for alternative energy and nutrients in form of fertiliser. To increase the treatment of organic waste quantities, peripheral digestion plants can have a significant contribution. Although small scale digestion units have higher Investment costs based on the waste quantities processed, a specialisation on suitable wastes and an efficient use of alternative energy and fertiliser can guarantee an economic and ecological success.

Development of a rotating fermentation reactor for Biogas production from organic waste
© Wasteconsult international (5/2015)
To maximize biogas yields, adequate substrate mixing during anaerobic digestion (AD) is of particular importance. In dry AD this may be hampered by high solid matter Contents causing a pronounced wear of mixing tools and triggering costly maintenance interruptions. This study aims at the development of a rotating drum fermenter (RDF) to overcome these problems. As a first step towards the development of a full-scale RDF for dry AD of biowaste, particular attention was given to the mixing performance. Therefore, a lab-scale RDF was constructed from acrylic glass to allow visual inspection of the radial mixing process.

The APECS-biomass model
© Wasteconsult international (5/2015)
Organic wastes in all their different shapes and compositions have gained significant commercial, political and academic interest during the last decade. The main driver for this development is the widely accepted consideration of organic wastes as valuable resources rather than problematic or worthless stuff. With the aim to turn the economy from its fossil basis into a bio-economy with presumably higher resource efficiency and less negative or even positive climate impact, governments in many countries have startedto support the use of waste biomass in many ways including subsidies.

Microwave-Assisted Organsolv-Pretreatment of Biological Residues
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2014)
Due to the scarcity of arable land and the competition with food production, lignocellulosic residues, such as straw come into the focus of the considerations of biofuel production. Lignocellulosic residues are not suitable for direct use in conversion processes, such as bioethanol production. The reason is their plant physiological composition.

Eco-Efficiency Potential for Anaerobic Digestion and Composting of Biowaste
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (11/2014)
This study conducted by the bifa Environmental Institute on behalf of the Bavarian State Ministry of the Environment and Consumer Protection, focuses on the analysis of the eco-effi cieny potentials of composting and fermentation of biowaste.

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