The paper presents a model-based evaluation of technological upgrades on the energy and cost balance in a large biological nutrient removal (BNR) wastewater treatment plant (WWTP) in the city of Slupsk (northern Poland). The proposed upgrades include chemically enhanced primary sludge removal and reduction of the nitrogen load in the deammonification process employed for reject water treatment. Simulations enabled to estimate the increased biogas generation and decreased energy consumption for aeration. The proposed upgrades may lead the studied WWTP from the energy deficit to energy neutrality and positive cost balance, while still maintaining the required effluent standards for nitrogen. The operating cost balance depends on the type of applied coagulants/flocculants and specific costs of electric energy. The choice of the coagulant/flocculent was found as the main factor determining a positive cost balance.
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December 01 2016
Strategies for achieving energy neutrality in biological nutrient removal systems – a case study of the Slupsk WWTP (northern Poland)
Ewa Zaborowska;
1Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdansk 80-233, Poland
E-mail: ezab@pg.gda.pl
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Krzysztof Czerwionka;
Krzysztof Czerwionka
1Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdansk 80-233, Poland
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Jacek Makinia
Jacek Makinia
1Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdansk 80-233, Poland
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Water Sci Technol (2017) 75 (3): 727–740.
Article history
Received:
August 14 2016
Accepted:
November 18 2016
Citation
Ewa Zaborowska, Krzysztof Czerwionka, Jacek Makinia; Strategies for achieving energy neutrality in biological nutrient removal systems – a case study of the Slupsk WWTP (northern Poland). Water Sci Technol 13 February 2017; 75 (3): 727–740. doi: https://doi.org/10.2166/wst.2016.564
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