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This professional book deals with belt drying of sewage sludge,
mainly of municipal but also of industrial origin. The
wastewater treatment resulting in sludge production is briefly
described. The types of sludge and their degree of stabilization is
treated in depth as they have a high impact on their suitability
for belt drying and the necessary exhaust air treatment. Different
belt drying systems with or without condensing units and with
extruding of dewatered sludge or partial recirculation of dried
sludge are presented. Specific water evaporation and energy demand
are tabulated for each dryer system on basis of indications of
dryer manufacturers, measurements or information of dryer
operators. Different sources for thermal energy are
stipulated and complete systems of energy supply with internal or
external usage of exhaust energy described. Occurring gas
compounds in dryer exhaust air and their special features are
mentioned in depth. The components and complete systems for exhaust
air cleaning are discussed also in their efficiency of removal of
individual odorous gas components or of total amount of volatile
organic compounds. Conveying systems and storage of dewatered
sludge as well as of dried sludge are described together with the
related safety issues. Dryer control as well as ATEX, SIL and
HAZOP issues and economic aspects are discussed briefly
in individual chapters. The book will be useful for engineering
enterprises and consultants designing belt drying systems for
sludge, but will also transfer useful information to
operators. Also authorities dealing with the permission of
sludge drying plants will find important aspects with regard to
environmental protection and reasonable economic and continuous
operation under safe conditions.
Das Fachbuch behandelt die Theorie und Praxis der Bandtrockner
sowie ihre Anwendung in zahlreichen Einsatzgebieten wie
Landwirtschaft, Lebensmittelindustrie, chemischer Industrie,
Pharmazie, Grundstoffindustrie, Entsorgungswirtschaft und
Abwasserreinigung. Es bietet Hinweise über die
verfahrenstechnische und konstruktive Auslegung sowie den Betrieb
der Anlagen. Für Berechnungen stehen Stoffwerte von industriellen
Trocknungsgütern und von Trocknungsgasen zur Verfügung. Der Leser
ist so in der Lage, mit Hilfe des Buches eine erste grobe
Berechnung seines trocknungstechnischen Problems durchzuführen.
Vielfach sind auch Zahlenwertgleichungen für
Rechnerprogrammierungen angegeben. Die computerunterstützte
Optimierung wird ebenso wie die Simulation der Strömung in
Bandtrocknern behandelt.  Auch werden die Möglichkeiten der
Energieeinsparung sowie der Abwärmenutzung hervorgehoben und
wichtige Gesichtspunkte wie Arbeitssicherheit und Umweltschutz
angesprochen. Der Autor verfügt über eine langjährige Erfahrung
in Forschung und Industrie.
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