The paper you’re about to write should only include background/history do no write about anything else other than the background. The background should include the history of wastewater treatment. CAS-Activated sludge system MBR-Membrane bioreactor include figures of CAS & MBR systemtalk about: previous systems and why you use mbr now Removal efficiencies explain its process History of purification Before they used to use activated carbon now they are using Nanoparticles
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