To clarify water containing particles with a diameter of 120 m, a settling tank (32 m long, 2.1 m across, and 1.6 m deep) is used. The particle density is 2.5 g/cm3, and the dynamic viscosity of water is 1.3 x 10-2 g/cm.sec. What is the highest flow rate that can be tolerated to ensure that all particles settle in the tank?

An anaerobic digester is operated with a hydraulic retention time (HRT) of 25 d and a flow rate of 0.85 m³/d. The influent substrate concentration is 18 g/L and the digestion process is assumed to follow first order kinetics with a Ko value of 0.09 d'¹. Calculate: (a) the liquid volume of the anaerobic digester, V (m³) (b) the effluent substrate concentration, So (g/L)

A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m³/s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system.

How long would it take for chloride to be detected just outside the clay liner at the secondary MCL of 250mg/L? Assume diffusion is the only mechanism

Determine the terminal settling velocity (cm/s) of a particle of diameter 0.171 mm and density 1.83 g/cm³. At the water temperature of 12 C, the water density and viscosity may be taken as 1.0 g/cm³ and 1.235 mPa-s, respectively.

For quiescent conditions determine the settling velocity of spheres in water as a function of particle diameter. Assume the particle density is 1050 kg/m³ and use a particle diameter range of 0.01 to 10 mm.

A rectangular settling basin has a depth of 3 m, a length of 40 m and a width of 6 m. The water treated in the basin has a flow rate of 500 L/s and contains 50 mg/L of type a particles, 100 mg/L of type b particles and 180 mg/L of type c particles (particle type letters refer to the particles listed in problem 1). What is the suspended solids concentration in the effluent from the settling basin? Determine the overall percent removal of suspended solids from the water achieved by the settling basin.