Exp) Option d is the correct answer.

Option d is correct: Membrane Bioreactors” are commonly discussed in the context of wastewater treatment technologies. These systems combine biological treatment (using microorganisms) with membrane filtration to efficiently remove pollutants from wastewater. The membranes act as barriers, allowing clean water to pass through while retaining suspended solids and microorganisms. Membrane bioreactors are widely used in treating domestic and industrial wastewater.

Source: “https://www.thehindu.com/news/cities/chennai/all-government-hospitals-to-have-effluent-treatment-plants-for-better-biomedical-waste-management/article67116298.ece

https://pib.gov.in/PressReleaseIframePage.aspx?PRID=1759750”

https://www.pcimembranes.com/articles/membrane-bioreactors-mbr-for-wastewater-treatment/