A review of the literature published in 2011 on topics relating to wastewater treatment innovations in the areas of modeling, instrumentation, automation and optimization of wastewater treatment is presented. Modeling Gujer (2011) argued that the application of mathematical models in biological wastewater treatment has not yet reached its full potential. Daigger (2011) presented the characteristics of effective models along with how wastewater modeling is integrated into the wastewater project life cycle. The desirable characteristics of wastewater treatment modeling platforms were then ---------Buzatu, P.; Lavric, V. (2011) Submerged Membrane Bioreactors for Wastewater Treatment. Multi-Objective Optimization. Chem. Eng. Trans. 25, 267-272. Chan, L.; Leu, S.-Y.; Rosso, D.; Stenstrom, M.K. (2011) The Relationship Between Mixed-Liquor Particle Size and Solids Retention Time in the Activated Sludge Process. Clech-Goods, C.; Ramsay, I.; Christiansen, N.; Shen, S.; Garnett, C. (2011) A New Data Management System for Tracking Licenced Wastewater Discharges In Queensland. MODSIM -Int. Congr. Model. Simul. -Sustaining Future: Underst. Living Uncertainty, 3128-3134. Coats, E.R.; Watkins, D.L.; Kranenburg, D. (2011) A Comparative Environmental Life-Cycle Analysis for Removing Phosphorus from Wastewater: Biological versus Physical/Chemical Processes. Water Environ. Res., 83, 750-760. Corominas, L.; Villez, K.; Aguado, D.; Rieger, L.; Rosé; C.; Vanrolleghem, P. (2011) Performance Evaluation of Fault Detection Methods for Wastewater Treatment Processes. Gallani, S.; Mulas, M.; Olsson, G. (2011) Systematic Approach to the Design of Operation and Control Policies in Activated Sludge Systems. Ind. Eng. Chem. Res. 50 (14), 8542-8557. De Gracia, M.; Huete, E.; Beltrán, S. Grau, P.; Ayesa, E. (2011) Automatic Characterisation of Primary, Secondary and Mixed Sludge Inflow in Terms of the Mathematical Generalised Sludge Digester Model. Water Sci. Technol. 64 (3), 557-567. Delgadillo-Mirquez, L.; Lardon, L.; Steyer, J.-P.; Patureau, D. (2011) A New Dynamic Model for Bioavailability and Cometabolism of Micropollutants During Anaerobic Digestion. Water Res. 45 (15), 4511-4521. Dey, A.; Truax, D.D.; Magbanua Jr., B.S. (2011) Optimization of Operating Parameters of Intermittent Aeration-Type Activated Sludge Process for Nitrogen Removal: A Simulation-Based Approach. Water Environ. Res., 83, 636-642. Dhar, B.R.; Elbeshbishy, E.; Nakhla, G.; Ray, M.B. (2011) Sono-Thermal Pretreatment of Waste Activated Sludge for Enhanced Anaerobic Digestion and Volatile Sulfur Compounds Control in Biogas.