A rectangular grit chamber has the following properties:

V $=294$ m$3$ A $=147$ m$2$ f $=0\mathrm{.}025$

The wastewater flow and wastewater particles have the following characteristics:

Q $=0\mathrm{.}78$ m$3/$s

p $=1\mathrm{.}8$ x $103$ kg$/$m$3$ k $=0\mathrm{.}035$

What is the diameter $($in m$)$ of the smallest particle that will be $100\%$ removed at $20$C$?$

What $\%$ removal of particles with dp $=0\mathrm{.}9$ x $10-4$ m will be achieved in the grit chamber?

What $\%$ removal of particles with dp $=1\mathrm{.}5$ x $10-4$ m will be achieved in the grit chamber?

If the particle in part a is just scoured in the grit chamber, what is the length of the grit chamber?

What qualitative change in the grit chamber design should be implemented to avoid scouring the part a particle? Briefly explain your reasoning.