What is the minimum detention time recommended for direct filtration?

The minimum detention time recommended for direct filtration is established to ensure that the water has adequate contact time with the filter media, allowing for effective removal of particulates and contaminants. A detention time of 5 to 20 minutes strikes a balance between operational efficiency and effective treatment. This time frame allows for sufficient particle settling and filtration processes without leading to excessive waiting that could reduce throughput and efficiency.

Direct filtration processes are designed to handle water with relatively low turbidity, and the specified detention time optimizes the removal of finer particles, helping to meet the water quality standards desired for drinking water. Thus, the range of 5 to 20 minutes is aligned with best practices in the field of water treatment, supporting effective filtration while maintaining a practical approach to system design and operation.