Synergistic Effects by Thermal and Biological Waste Treatment Facilities at Integrated Sites
the protagonists of conventional waste disposal have faced off against their opponents who wanted to recycle materials exclusively. In the mean time, there are many reasons to abandon these contrary positions and think about synergies between the concepts of thermal and material recycling processes. The latest impulse for this is surely the most recent legal development in the European Union in accordance with national objectives of having a waste management system that is more directed at the protection of the climate and resources.
Bio-waste treatment facilities are sources of greenhouse gases, like methane or nitrous oxide, which were formerly neglected and are now under discussion. The European Waste Framework Directive and following national laws will develop the separate collection of bio-wastes in the future and as a consequence also the greenhouse gas emission problem.
An approach for reducing greenhouse gas emissions from bio-waste treatment facilities is the integration of these plants into the infrastructure and operation of existing municipal solid waste incineration plants (MSWIP). The evaluation of this concept was carried out by a consortium of the consulting engineers ia GmbH, Munich and Qonversion, Bamberg, commissioned by the Association of the Bavarian waste incineration plants ATAB. The project was funded by the Bavarian Ministry for Environment.
Focus of the study was the minimization of the climate unfriendly greenhouse gas emissions methane and nitrous oxide from anaerobic digestion (AD) plants for bio-waste. Other synergy effects arising by the joint usage of infrastructure and manpower in the WSWI and AD plant were also investigated.
The ecological and economical effects of the integrated concept were studied exemplarily for three waste incineration sites with different capacities, each in connection with a digestion technology, specific for the different local conditions. The study clearly demonstrates that the integrated concept has a significant higher ecological efficiency:
• Greenhouse gas emissions can be reduced between 53 % and 69 %,
• Treatment costs can be reduced by 25 % in average.
For all three examples could be proven that the integrated operation of an anaerobic digestion plant for bio-waste on the site of a municipal solid waste incinerator has advantages compared with a green field plant for anaerobic digestion. The realization of such concept is advised – also for reasons of public acceptance.
Waste-to-Energy (WtE) facility
Renergia, a brand new Waste-to-Energy (WtE) facility opened in Canton Lucerne, shows that Waste-to-Energy can provide reliable heat for industries.
Category: Incineration / Waste-to-Energy plant
Executing firm: Renergia Zentralschweiz AG
MBT Ljubljana, Slovenia
In Slovenia arises one of the largest and most modern waste treatment plants in Europe.
Category: Recycling / MBT
Executing firm: STRABAG AG
Flue Gas Cleaning
The final unit of the incineration plant is one of the most important parts as it has the objective of cleaning the air pollutants produced.
Executing firm: ete.a - Ingenieurgesellschaft für Energie– und Umweltengineering & Beratung mbH
Batch Dry Fermentation
The biogas produced from the waste can be converted in a CHP to electrical and thermal energy or fed as processed bio-methane into the natural gas grid or used as fuel (CNG).
Category: Recycling / Fermentation
Executing firm: BEKON Energy Technologies Co. & KG
MBT Warsaw, Poland
The Bio-Dry™ system is a static, aerated and flexibly enclosed reactor for the biological drying of various solid waste matters containing some biodegradable contents.
Category: Recycling / MBT
Executing firm: Convaero GmbH