The review includes literature published during the year 2012 regarding the use of biofilms and bioreactors to treat wastewater. Topics considered are: biofilm formation and factors that impact biofilm formation; extracellular polymeric substance and its extraction from biofilms; biofilm consortia and quorum sensing; biofilm imaging techniques; biofilm reactors and modeling.

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Literature published during the year 2013 regarding the use of biofilms and bioreactors to treat water and wastewater is revie\ ed herein. The review is organized into the following sections: biofilm fornl. ationand factors Ulat impact biofilm fom13tion; xtracellular polymeric substance and its e rtraction from biofihns; biofilm consortia and quorum sensing; biofilm imaging teclmiques; biofilm carriers and biofilm reactors.