4 replies to this topic

[tito200909]

Hi

 

I am currently designing a process for reducing sulphites in waste water. I am passing oxygen through a reactor at 1.52 cubic meter per hour. The water flows in at 2.355 cubic meter per hour. Could someone tell me how to calculate the number of holes and the size of the sparger?

 

Thank you

[Erwin APRIANDI]

This will be depend on the type of sparger that you are selecting, the rules of defining the sparger type and number of sparger is depend on how much you wanted the air to be distributed in the tank/reactor so the most important is the size of the reactor (cross sectional horizontal area) and how big is the coverage distribution area of the sparger.

 

A_(reactor)/A_{(distibution of sparger)} = No. of sparger Required.

 

While for the oxygen flowrate required is based on the required Oxygen to oxidize the component in the waste water stream (from the BOD and COD)

[ankur2061]

tito200909,

 

For such a small flow, a pipe size of 1" or 1-1/2" should suffice. You could even go for a smaller pipe size but then it may be very difficult to punch holes in the pipe and maintain the structural integrity of the sparger pipe.

 

For sizing of spargers refer the following link:

 

http://www.cheresour...g-calculations/

 

 

Regards,

Ankur.

[tito200909]

Ankur 2061 thank you so much

 

I carried out the calculations but I'm not very sure if they are right

 

I got 

Reynolds number: 1.098

Fanning friction: 0.0048

Kinetic Energy: 9.814*10^(-5)

Delta Pp: 0.000413

Delta Po: 0.00413

Y: 4.898*10^(-4)

Ao: 0.00087 sq mm

 

 

I am using a pipe with diameter 2 inches and distributor length of 9cm

 

Do these values seem right?

Edited by tito200909, 05 September 2013 - 12:05 AM.

[ankur2061]

tito200909,

 

Send me your calculations as an excel sheet. i will check and revert back.

 

Regards,

Ankur.