title: Strategies for achieving energy neutrality in biological nutrient removal systems - a case study of the Slupsk WWTP (northern Poland).
abstract: 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.
authors.affiliation: Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdansk 80-233, Poland E-mail: ezab@pg.gda.pl.
authors.forename: Ewa
authors.initials: E
authors.lastname: Zaborowska
authors.affiliation: Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdansk 80-233, Poland E-mail: ezab@pg.gda.pl.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Czerwionka
authors.affiliation: Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Gdansk 80-233, Poland E-mail: ezab@pg.gda.pl.
authors.forename: Jacek
authors.initials: J
authors.lastname: Makinia
mesh_terms: D003246:Conservation of Energy Resources; D005427:Flocculation; D008962:Models, Theoretical; D009584:Nitrogen / Q000032:analysis; D011044:Poland; D012722:Sewage / Q000737:chemistry*; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification / Q000191:economics / Q000379:methods*
chemical_list: D009584:Nitrogen; D012722:Sewage; D062065:Wastewater