Dear reader, due to some heavy work.we couldn’t touch with u last few months, OK.

Now we see as an with small example!

**Aeration tank:**

Influent BOD: 250mg/l(after 30% reduction in the Physio-chemical treatment followed by primary clarifier

Process selected: Activated sludge process

**Design Condition:**

F/M (Food/Microbes) =0.15

MLSS (Mixed Liquor Suspended Solids)=3000 mg/l

**Calculation of Aeration Tank Volume**:

F/M: So (?-MLVSS)

F/M: Food to Microbes ratio in d

^{-1}So: influent substrate concentration in mg/l

MLVSS: Mixed Liquor Volatile Suspended solids in mg/l =0.8 x MLSS

? – Hydraulic retention time =V/Q

Where V=Aeration tank volume in cu.m

Q=Effluent flow in cu.m per day

Hence, substituting these values,

0.15=250/(v/1400 x 0.8 x 3000)

V=972 KL, selected volume =1400 KL

I have just read your topic on aeration volume calculation today. It’s simple and very interesting to me but I would like to know where did you get the number 1400 in your formula or equation? 0.15= 250/(v/1400×0.8×3000). Thank you.

Exactly, The information is valuable, Until, eventually the number 1400 was found unknown.

Acc. to the formula I use to calc. the Volume is

V= Q.BOD / (F/M).MLSS

And my question is that how will be the volume of the MBBR based aeration can be calculated?

Dear Sir

Every think OK.but I don’t know about the value of 1400. For which using that one

1400 is assumption fig of water effluent quantity in M3/day

hai sir

i need differnt example on areartion tank design, can you give me .

Where did you get value 1400 in your formula and v express to what?

resolved check the post

1400 is plant capacity I.e. You want to handle 1400 m3 per day. This can be as per your need.

e.g. I am going to establish Etp plant of 900 m3 per day then Q= 900 m3/ day Accordingly Vaerationn will be less.

Design an aeration tank for a flow of 790 m3/ hour with BOD of 200 mg/L an F/M ratio o f0.4 day-1 and SVI of 100 ml/gram. Air supply rate is 10 m3/ m2 of sewage /day. Assume W: L = 1:4.

PLEASE IF ANY ONE CAN SOLVE THIS

Explain the equation sir.

i cant understand the KL the volume tank =972 KL ITS MEAN 972,000LITERS?

KL mean Kilo Litre (1000 Litre)

how we calculate the volume didnt arrive to find v

Dear sir,

Thanks for the example..it was realy very helpful

But i Didnt understood the last equation..from where did u get v=972?

Pls someone explain..

V mean Volume of Aeration Tank in m3 (in capacity of m3 holding) and 1400 mean treatment qty to be treated /day

Sir, my capacity tank has a capacity of 480 kld/per day so how much capacity will be the air blower?The tank has to be lane in the air grid.

What is the basics of considering F/M ratio – 0.15, MLSS – 3000 mg/lit? How it was link with COD And BOD? Or Its Just assumptions.

Please explain..!!

0.15=250/(v/1400 x 0.8 x 3000)

V=972 KL, selected volume =1400 KL

Please check calculation.

After solving the equation We get V= 972KL, but selectedvolume is = 1400Kl

But Why please explain

Dear sir,

We need to design aeration plz help,

Flow rate = 167cum/hr

Inlet BOD= 105 ppm

MLSS = 9000ppm

Please help for above