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Table 1

Phenomena influencing the α-factor

Phenomena influencing the α-factorReferences
Surfactant concentrations Stenstrom & Gilbert (1981), Wagner & Pöpel (1998), Gillot & Héduit (2000), Loubière & Hébrard (2004), Rosso & Stenstrom (2006b), Sardeing et al. (2006), Gillot & Héduit (2008) and Jimenez et al. (2014a)  
Mixed liquor suspended solids concentration Muller et al. (1995), Krampe & Krauth (2003), Cornel et al. (2003), Germain et al. (2007), Racault et al. (2010), Henkel et al. (2011), Durán et al. (2016) and Baquero-Rodríguez et al. (2018)  
Rheological properties Krampe & Krauth (2003), Vandu & Krishna (2004), Nittami et al. (2013), Durán et al. (2016) and Amaral et al. (2017)  
Tank geometry Groves et al. (1992), Fisher & Boyle (1999), Capela et al. (2002) and Gillot et al. (2005)  
Daily/seasonal dynamics Libra et al. (2005), Leu et al. (2009) and Jiang et al. (2017)  
Mean cell residence time EPA (1989), Rosso & Stenstrom (2005), Gillot & Héduit (2008), Jiang et al. (2017) and Stenström & la Cour Jansen (2017)  
Aeration system (types) Kessener & Ribbius (1934), Rosso & Stenstrom (2005), Rosso & Shaw (2015) and Garrido-Baserba et al. (2018)  
Microbial activity Steinmetz (1996) and Henkel et al. (2009)  
Organic load (chemical oxygen demand) Eckenfelder et al. (1956), Zlokarnik (1980), Steinmetz (1996), Leu et al. (2009), Jiang et al. (2017) and Garrido-Baserba et al. (2018)  
Phenomena influencing the α-factorReferences
Surfactant concentrations Stenstrom & Gilbert (1981), Wagner & Pöpel (1998), Gillot & Héduit (2000), Loubière & Hébrard (2004), Rosso & Stenstrom (2006b), Sardeing et al. (2006), Gillot & Héduit (2008) and Jimenez et al. (2014a)  
Mixed liquor suspended solids concentration Muller et al. (1995), Krampe & Krauth (2003), Cornel et al. (2003), Germain et al. (2007), Racault et al. (2010), Henkel et al. (2011), Durán et al. (2016) and Baquero-Rodríguez et al. (2018)  
Rheological properties Krampe & Krauth (2003), Vandu & Krishna (2004), Nittami et al. (2013), Durán et al. (2016) and Amaral et al. (2017)  
Tank geometry Groves et al. (1992), Fisher & Boyle (1999), Capela et al. (2002) and Gillot et al. (2005)  
Daily/seasonal dynamics Libra et al. (2005), Leu et al. (2009) and Jiang et al. (2017)  
Mean cell residence time EPA (1989), Rosso & Stenstrom (2005), Gillot & Héduit (2008), Jiang et al. (2017) and Stenström & la Cour Jansen (2017)  
Aeration system (types) Kessener & Ribbius (1934), Rosso & Stenstrom (2005), Rosso & Shaw (2015) and Garrido-Baserba et al. (2018)  
Microbial activity Steinmetz (1996) and Henkel et al. (2009)  
Organic load (chemical oxygen demand) Eckenfelder et al. (1956), Zlokarnik (1980), Steinmetz (1996), Leu et al. (2009), Jiang et al. (2017) and Garrido-Baserba et al. (2018)  
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