
Keywords: رزین مبادله کاتیونی; AO; anaerobic or anoxic/oxic process; A2O; anaerobic/anoxic/oxic process; CAST; conventional activated sludge treatment; CER; cation exchange resin; DI; deionized; EPS; extracellular polymer substance; EPS-Ca; product of EPS-Ca2+ interaction; EPS-Fe; pr