Green chemistry (GC), also termed as sustainable chemistry, has emerged as an attractive approach into the sustainable development, leading to promising solutions to the existing problems. Moreover, it reduces the utilization of non-renewable resources and provide golden opportunities for new processes and synthesis with scientific innovations. In this review paper, we will discuss various challenges of our water resources and water-related problems with special emphasis on how these challenges can be overcome by using eco-friendly techniques for chemical water treatment. Furthermore, using Ferrate (VI) as a green chemical and the use of microchannel reactor at the same time are recognized to be very promising techniques for the chemical water treatment. The challenges due to polluted water had made to develop certain techniques which have increased efficiency, productivity and are more effective in energy production. Microchannel reactor is one of such technologies which is more reliable than conventional methods.

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