NDLI: Energy self-sufficient sewage wastewater treatment plants: is optimized anaerobic sludge digestion the key?

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Jenicek, P. Kutil, J. Benes, O. Todt, V. Zabranska, J. Dohanyos, M.
Spatial Coverage	Czech Republic
Description	Author Affiliation: Jenicek P ( Department of Water Technology and Environmental Engineering, Faculty of Environmental Protection, Institute of Chemical Technology Prague, Technicka 5, 166 28 Prague, Czech Republic E-mail: jenicekp@vscht.cz.)
Abstract	The anaerobic digestion of primary and waste activated sludge generates biogas that can be converted into energy to power the operation of a sewage wastewater treatment plant (WWTP). But can the biogas generated by anaerobic sludge digestion ever completely satisfy the electricity requirements of a WWTP with 'standard' energy consumption (i.e. industrial pollution not treated, no external organic substrate added)? With this question in mind, we optimized biogas production at Prague's Central Wastewater Treatment Plant in the following ways: enhanced primary sludge separation; thickened waste activated sludge; implemented a lysate centrifuge; increased operational temperature; improved digester mixing. With these optimizations, biogas production increased significantly to 12.5 m(3) per population equivalent per year. In turn, this led to an equally significant increase in specific energy production from approximately 15 to 23.5 kWh per population equivalent per year. We compared these full-scale results with those obtained from WWTPs that are already energy self-sufficient, but have exceptionally low energy consumption. Both our results and our analysis suggest that, with the correct optimization of anaerobic digestion technology, even WWTPs with 'standard' energy consumption can either attain or come close to attaining energy self-sufficiency.
File Format	HTM / HTML
ISSN	02731223
Issue Number	8
Volume Number	68
e-ISSN	19969732
Journal	Water Science & Technology
Language	English
Publisher	IWA Publishing
Publisher Date	2013-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Hydrology Energy-generating Resources Waste Disposal, Fluid Methods Waste Water Anaerobiosis Biofuels Biological Oxygen Demand Analysis Czech Republic Sewage Instrumentation Journal Article Research Support, Non-u.s. Gov't
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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