HAASE MBT with Anaerobic Digestion
HAASE provide a number of different AD technologies: MBT+wAD as described below, and also anaerobic digestion for source segregated kitchen waste and or biowaste. They also provide systems for anaerobic digestion of silage.
HAASE are represented by Clarke Energy in the United Kingdom.
In this review we have used the HAASE Luebeck plant as an example of a case history to review their processes as implemented at that site.
150,000 tons pre annum of mixed municipal solid waste, collected from the Luebeck area is processed in this plant, on a compact 3 Hectare site.
It is suggested that the HAASE MBT+wAD requires a low “landtake” to throughput ratio, which seems to be amply borne out by the fact that this plant is much more than just an Anaerobic digestion Plant.
The plant accepts mixed waste (MSW) and an initial MRF (Materials Recycling Facility) provides mechanical pre-treatment which separates:-
- valuable metals for recycling,
- organic materials for treatment at by Anaerobic Digestion (AD)
- and refines non recyclable paper and plastic into approximately 60,000 tons per year of high calorific value Refuse Derived Fuel (RDF).
This would appear to be not only achieving good recycling, but also diverting the maximum energy resource from landfilling, although finding a market for the RDF produced is usually quite hard to achieve. Elsewhere the poor market for RDF has acted as a dis-incentive to the production of RDF for off site sale.
However, there is no such problem for this impressive project, as 40,000 tons per year of the RDF generated in Luebeck is consumed by the community heating plant (CHP) at the neighbouring city of Neumuenster. Use of this RDF replaces approximately 15,000 tons of fuel oil per year which would otherwise have been consumed by this city. This comprises power sufficient to heat 7,500 homes.
The HAASE MBT+wAD, Wet Anaerobic Digestion process converts the organic waste into methane rich biogas.
The residues which remain after digestion are further stabilised by the HAASE wet oxidation (aeration) process and dried to meet stringent German and EU wide legislation for landfilling.
Water used in the HAASE MBT+wAD is recycled within the process with excess treated at the HAASE membrane water treatment plant to clean water.
 Elsewhere, there have been problems with odours emitted from the organic materials, both during handling, before they are digested and during the process. Finally, there can be odours emitted when the fibrous residue is discharged from the AD stage and commences wet oxidation.
We are reliably informed that the VocsiBox® odour prevention process (again developed by HAASE, treats all ventilation and process air before it is released to atmosphere. This ensures an extremely low level of emissions and negligible odours.
Overall the plant generates 1.9MW of renewable electricity, much of which is fed into the local grid, and in addition 2.3MW of heat is generated using the biogas from the AD process.
Plus, there is enough renewable energy produced to power the entire plant itself.
Thus, the HAASE MBT+wAD team do say, with plenty of evidence at Luebeck and elsewhere to justify their claim, that this is “the ideal solution for implementing sustainable, decentralised, community focused, Waste Management Strategies”.
Visit Clarke Energy here.
See a .pdf and full explanation of the HAASE process here, and visit the HAASE web site here.
 Clarke Energy/HAASE is building Anaerobic Digestion
plants for the GMWDA in the United Kingdom,
and an AD with MBT plant in Malta.
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