(Solved): A conventional activated sludge plant has a flow of 12mgd with an influent BOD of 250mg/1 and suspe ...

A conventional activated sludge plant has a flow of $12\mathrm{mgd}$ with an influent BOD of $250\mathrm{mg}/1$ and suspended solids of $230\mathrm{mg}/1$. The primary clarifier removes 25 percent of the BOD. The 10 aeration tanks are $40\mathrm{ft},100\mathrm{ft}$ long, and $15\mathrm{ft}$ deep. The concentration of MLSS is $2600\mathrm{mg}/1$. quantity of waste sludge is $0.18\mathrm{mgd}$ and suspended solids in waste sludge is $8600\mathrm{mg}/1$. BOD and suspended solids in the treatment plant effluent are $25\mathrm{mg}/1$ and $20\mathrm{mg}/1$ respectively. Determine: i) Detention time in each tank ii) Aeration tank BOD loading iii) $\mathrm{F}/\mathrm{M}$ ratio iv) Sludge age v) Plant BOD removal efficiency vi) Plant suspended solids removal efficiency vii) Discuss the types of microorganisms. viii) Write the important biochemical equations in the aeration tank.