Which type of materials may be used as media in intermittent sand filter systems?

Intermittent sand filter systems rely on specific types of media that effectively support the treatment of wastewater through physical, biological, and chemical processes. Mineral sand or crushed glass is ideal because these materials have the right characteristics, such as appropriate size distribution and porosity, which allow for effective filtration and aeration of wastewater.

Mineral sand, with its ability to drain well and support microbial activity, is particularly suited for this application as it helps in breaking down contaminants. Crushed glass also performs similarly, providing a stable structure that facilitates the movement of water while also supporting biofilm growth, which is crucial for filtration efficiency.

Other materials listed, such as metal, concrete, plastic, rubber, wood, and textile, do not possess the necessary filtration properties and may not create the conducive environment needed for wastewater treatment. Therefore, mineral sand or crushed glass stands out as the most effective choice for media in these systems, ensuring optimal performance and compliance with treatment standards.