Performance and stability of an expanded granular sludge bed reactor modified with zeolite addition subjected to step increases of organic loading rate (OLR) and to organic shock load (OSL) - Pérez-Pérez, T.; Pereda-Reyes, Ileana; Pozzi, Eloisa; Oliva-Merencio, D.; Zaiat, Marcelo (Water Science and Technology, 2018)