IST-Anlagenbau GmbH

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Information For The Press
WendeWolf Solar Sludge Dryer for WWTP of Managua, Nicaragua; Oct. 2009 - 07.10.2009
The German Engineering company IST-Anlagenbau GmbH is marketing their WendeWolf® solar sludge drying system since 1994. The first pilot plant had to be financed privately. Meanwhile 90 WendeWolf® machines are running in six European Countries, in Turkey and in Australia. The latest order came from Nicaragua for five machines. This is will be the largest solar drying plant of the Americas. The new WWTP of Managua will help to prevent Lake Managua from a biological collapse. The project is financed by the German Government and is constructed by Biwater International Ltd.
The daily output of the new plant will be up to 100 m³ dewatered sludge but the infrastructure for such waste does not exist in Nicaragua. Dried sludge however is easy to handle and can be used in agriculture whenever the field is ready to be planted. If necessary it can be put into landfill which is very difficult with  moist filter cake. Industrial dryers require a large amount of thermal energy, between 700 and 1000 kWh per ton of water evaporated. Solar sludge dryer achieve the same with 20-40 kWh or about 5% but they require a large area.  In the case of Managua the required ground area is about 8 000 m² or 0,4 m² per ton of filter cake. In the climate of Middle Europe this value is three times more or 1.2 m²/t . The technology was accepted by the consultant office, Fichtner International and the KfW Bank agreed to finance the extra cost, which amount to 2-3% of the total investment.
IST-Anlagenbau GmbH tendered successfully for this project and will ship  five WendeWolf® at the end of Nov. 09 to Managua. The commissioning is planned in the February/March 2010.
IST-Anlagenbau GmbH is also participating with AECOM, Winnipeg with a paper at the 2009 WEFTEC Orlando Florida (Session S062) where the same kind of project is presented for the Island of Trinidad Tobago.

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World map with realized plants Download PDF file
Hall with first sludge Download JPG file