Journal
BIORESOURCE TECHNOLOGY
Volume 218, Issue -, Pages 1237-1245Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.06.119
Keywords
Anaerobic digestion; Biogas; Energy-positive wastewater treatment; Nitrogen recovery; Phosphorus recovery; Sewage
Funding
- Research Foundation Flanders (FWO-Vlaanderen)
- Special Research Fund (BOF) Research Stay Visiting Researcher (Bioproduction from diluted organic waste streams) [BOFVBO2014000101 BOF/VBO/017, 01T01713]
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The conventional treatment of municipal wastewater by means of activated sludge is typically energy demanding. Here, the potential benefits of: (1) the optimization of mesophilic digestion; and (2) transitioning to thermophilic sludge digestion in three wastewater treatment plants (Tilburg-Noord, Land van Cuijk and Bath) in the Netherlands is evaluated, including a full-scale trial validation in Bath. In Tilburg-Noord, thermophilic sludge digestion covered the energy requirements of the plant (102%), whereas 111% of sludge operational treatment costs could be covered in Bath. Thermophilic sludge digestion also resulted in a strong increase in nutrient release. The potential for nutrient recovery was evaluated via: (1) stripping/absorption of ammonium; (2) autotrophic removal of ammonium via partial nitritation/anammox; and (3) struvite precipitation. This research shows that optimization of sludge digestion may lead to a strong increase in energy recovery, sludge treatment costs reduction, and the potential for advanced nutrient management in full-scale sewage treatment plants. (C) 2016 Elsevier Ltd. All rights reserved.
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