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The Lolla Hart hospital has a small activated sludge plant to treat its wastewater. The average...

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Civil Engineering

The Lolla Hart hospital has a small activated sludge plant totreat its wastewater. The average daily hospital discharge is 1,500L per day per bed, and the average soluble BOD5 afterprimary settling is 500 mg/L. Their permit dictates that theeffluent BOD5 and TSS cannot exceed 30 and 20 mg/L,respectively, on an annual basis. Assume the MLVSS concentration inthe aeration basin will be maintained at 3,000 mg/L. Also, assumethat the concentration of BOD5 of the suspended solidsis equal to 60% of the suspended solids concentration. Thebiokinetic coefficients were measured and determined to be:

Ks=70 mg/L BOD5

um=2.5 day-1

kd = 0.06 day-1

Y = 0.6 mg VSS/mg BOD5 removed

Find:

SRT in days

The Aeration basin volume (L)

The Aeration period (days)

The kg of secondary solids wasted each day

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