Q6-(v) Only(v) ** total rate for both ponds = 129.2 + 57.8 = 187 kg/day ** total

Question

Q6-(v)

Only(v)

** total rate for both ponds = 129.2 + 57.8 = 187 kg/day

** total area = 6912 m2

** Total dimensions L x W = 144 x 48

** Dimension of each pond = 72 x 48

QUESTION 6 A proposal is under consideration to locate an integrated dairy products plant in regional Australia where wastewater disposal to sewer is not an option. Preliminary design calculations indicate that wastewater from the two main processing sections would have the following characteristics: Section Flow (m3/day BOD (mg O2/L Milk processing 180 Cheese processing 320 220 280

Explanation / Answer

Hi,

Plz give thumbs up.

Since you require only last answer,

Ans. v) THe volume of one tank is 102 * 34 * 1.5 ( Your value 72 * 48 does not give ratio 3:1 ).

The volume of two tanks is = 102*34*1.5*2 = 10404m3

Influent FLow = 180 +320 = 500 m3/day

HRT = {Volume of aeration tanks}/{Influent flow}

= 10404 / 500

= 20.808 days.

This is very high value as compared to standard value ( around 1 day for facultative pond)

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