The reject from the MF membrane filter at Tumanipharmz ( Problem 11-14 ) is to be treate...

The reject from the MF membrane filter at Tumanipharmz ( Problem 11-14 ) is to be treated with polymer and thickened. Because the potential for Cryptosporidium concentration in the backwash water, an overflow rate equal to or less than 0.2 m/h is required (Cornwell, 1999). Design three alternative sludge thickeners with the following underflow solids concentrations: 3%, 4%, and 5%. The following batch settling curve data are assumed to be representative.

A completed design will include the tank diameter, tank depth, and the running torque for the rake. Assume two day’s storage at an average P_s of 0.04.

Problem 11-14

A MF membrane filter has been selected for providing 136,000 m³/d of treated water for the ity of Tumanipharmz. The design recovery rate is 90%. The suspended solids concentration in the raw water is 29.1 mg/L. Estimate the feed flow rate to produce 136,000 m³/d of treated water, the reject flow rate, the suspended solids concentration of the concentrate, the sludge production (kg/d), and the percent solids concentration.