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Chair of Sanitary Engineering and Water Recycling
Development of a mechanical-biological treatment
process based on the BIOPERCOLAT®process
in order to reduce the waste amount and
to create refuse derived fuel
For most of the developing countries and especially for
many newly industrialized countries waste is getting
more and more a serious problem for the environment
and for the society. So far the most common way of
waste disposal is to dump it into landfills. Usually these
landfills are simple dumps without any sealing or
coverings. Hence, leachate water cannot be collected
and be treated with treatment plants as we know
them from Europe or other developed countries. As a
consequence the surrounding environment suffers
severe impacts and damages. In a global scale this
way of waste disposal heavily contributes to the global
warming by emitting the greenhouse gases CO 2
and
Methane.
In Europe the usage of landfills for the disposal of
household waste is prohibited by law since 2005. The
old landfills still need a long and expensive maintenance
up to 50 years. Nowadays waste incineration plants,
composting plants, recycling facilities and mechanicalbiological
waste treatment (MBT) plants are state of
the art. The big advantage of MBT plants is the low
energy consumption for the operation, low emissions
of greenhouse gases and a high energy recovery. Even
the invest costs are relatively low, compared the waste
incineration plants. Also the rate of return is very high,
as MBT plant can produce valuable refuse derived fuel
(RDF) and biogas. The biogas can be used to produce
electrical energy and heat by using combined heat and
power plant (CHP) or modern gas turbines.
As boundary conditions differs from country to country
and especially between developed and developing/
newly industrialized countries the in Germany well
approved MBT technology cannot be used for waste
of other countries one-to-one. One of the biggest
differences in the waste composition is the higher
organic as well as the higher water content. Beside that
the climate and the weather can have a big influence
on the performance.
The University of Stuttgart, in cooperation with the
German company WEHRLE Umwelt GmbH,
Emmendingen is working on the development of a new
MBT technology. This technology is based on a well
approved German technology, which is positively fieldtested
and successfully in use at the site Kahlenberg,
Ringsheim for more then 5 years. The main task of the
development is the adaption of the technology to other
boundary conditions. Hence, the University of Stuttgart
planed and installed a MBT pilot in central Thailand
in the province Petchaburi. During the operation the
suitability is going to be tested. The local Thai company
Cemtech Co. Ltd. and the „King Mongkut‘s Institute
of Technology Ladkrabang” (KMITL) are supporting
the project. The advantages by using the planed MBTtechnology
for the waste disposal are:
• Very low impacts on the local and global environment
(global warming)
• Relatively low investment costs
• High rate of return
• Clean Development Mechanism (CDM) ->Selling of
carbon credits
• Low tipping fees for the population
• Production of CO 2
-neutral and valuable RDF
• Production of CO 2
-neutral biogas
Pilot plant in Thailand
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