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Aquatic pollution occurs due to the discharge of harmful substances, chemicals or microorganisms into water bodies i.e. a stream, river, lake, ocean, aquifer, or other body of water resulting in contamination & degradation of water quality and rendering it unsuitable for human use or the environment. Many advanced water treatment techniques are followed before discharging this polluted water into the surrounding environment. However some limitations is there. In this context, Biofilms have become the important part of biological treatment of municipal waste water. Biofilm reactors are units where biofilm rich sludge are used in treatment of wastewater through many biological processes. Among all treatment methods Biofilm based bioreactors are considered as best available technologies for waste water treatment. Biofilms are complex structured porous and most tolerant communities of the aquatic ecosystem that includes environmentally efficient strains of algae, fungi, bacteria, actinomycetes and viruses. These microbial isolates have been extensively studied for assimilation, bio-sorption and biodegradation of almost all sorts of organic and inorganic pollutants in aquatic ecosystems. Further research is needed to bio-stimulate the promising strains of biofilms for pollution treatment. Considering the increased pollution stress, its negative impact on aquatic life and potential of aquatic biofilms to be used as indicators of pollution for controlling this pollution is reviewed in this study. K e y w o r d s

Combatment of Aquatic Pollution through Biofilm Technique: A Review