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Abstract
Wastewater is the water which is contaminated that cannot be used for drinking purposes and it may cause serious diseases. This wastewater needs to be treated to make it less harmful for use. Bioreactors promote the growth of microorganisms that break down the pollutants present in the wastewater. Various types of bioreactors like activated sludge bioreactor, anaerobic bioreactors SBRs, MBRs and MBBRs can be used for wastewater treatment. These bioreactors play crucial role in meeting regulatory standards and promoting sustainable water management practices in both municipal and industrial wastewater treatment facilities. In industrial wastewater treatment, activated sludge reactor, sequential bioreactors and membrane bioreactors treat the wastewater. There are various emerging contaminants that must be reduced for the protection of the water i.e. microplastics, nanoparticles and various endocrine disrupting compounds. Today, researchers are introducing eco-friendly bioreactors for better environment. In future, there is a need to make these bioreactors economically better, so that they can be used everywhere for the cleanliness of water.