Question

A filter unit is 4 m by 9m. After filtering $10000m^{3}/d$ in 24 hour period, the filter water is backwashed at a rate of $10lit/m^{2} /sec$ for 30 minutes. Calculate the average filtration rate, quantity and percentage of treated water used in washing and the rate of wash water flow in each trough. Assume 4 troughs.

Answer 1

A filter unit is 4 m by 9m. After filtering $10000m^{3}/d$ in 24 hour period, the filter water is backwashed at a rate of $10lit/m^{2} /sec$ for 30 minutes. Calculate the average filtration rate, quantity and percentage of treated water used in washing and the rate of wash water flow in each trough. Assume 4 troughs.