Cu(II) biosorption by living biofilms: Isothermal, chemical, physical and biological evaluation

Abstract Dissolved copper in stormwater runoff is a significant environmental problem. Biosorption of dissolved metals using microorganisms known as green, low-cost and efficient method. However, the role live biological agents remediation Sustainable Drainage (SuDS) has not been reported. In this study, effect pH, initial concentration temperature, on bacteria different stages biofilm development geotextile, along with Cu(II) removal efficiencies, were evaluated. Maximum efficiency (92%) was observed at pH 6. By decreasing from 6 to 2, log 5 reduction Carboxyl groups transformed -COO- –COOH. The maximum biosorption capacity (119 mg g?1) detected day 1 development, however, (97%) measured 21 incubation. Exteracellular Polymeric Substance (EPS) showed better protection CFUs more mature biofilms (day 21) less than 0.1 decrease when exposed 200 mL?1 Cu(II), whereas, incubation 2 number. Thermodynamic studies that biofilms, incubated for 7 days (117 mg g?1) occurred 35 °C. kinetic modelling data revealed physical, feasible, spontaneous exothermic process controlled biosorption, diffusion external layers biofilm, fitting pseudo-second order model. Equilibrium high R2 values Langmuir model indicated took place by monolayer living surface all development.