Consider a primary sedimentation tank (PST) in a water treatment plant with Surface Overflow Rate (SOR) of $40 \mathrm{~m}^{3} / \mathrm{m}^{2} / \mathrm{d}$. The diameter of the spherical particle which will have 90 percent theoretical removal efficiency in this tank is____ $\mu \mathrm{m}$ Assume that settling velocity of the particles in water is described by Stokes's Law.

Given: Density of water $=1000 \mathrm{~kg} / \mathrm{m}^{3} ;$ Density of particle $=2650 \mathrm{~kg} / \mathrm{m}^{3} ; g=9.81 \mathrm{~m} / \mathrm{s}^{2}$; Kinematic viscosity of water $(v)=1.10 \times 10^{-6} \mathrm{~m}^{2} / \mathrm{s}$

Consider a primary sedimentation tank (PST) in a water treatment plant with Surface Overflow Rate (SOR) of $40 \mathrm{~m}^{3} / \mathrm{m}^{2} / \mathrm{d}$. The diameter of the spherical particle which will have 90 percent theoretical removal efficiency in this tank is____ $\mu \mathrm{m}$ Assume that settling velocity of the particles in water is described by Stokes's Law.

Given: Density of water $=1000 \mathrm{~kg} / \mathrm{m}^{3} ;$ Density of particle $=2650 \mathrm{~kg} / \mathrm{m}^{3} ; g=9.81 \mathrm{~m} / \mathrm{s}^{2}$; Kinematic viscosity of water $(v)=1.10 \times 10^{-6} \mathrm{~m}^{2} / \mathrm{s}$

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