INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Reverse Osmosis

Reverse Osmosis

(OP)
HEY!

We are designing a processes of Reverse Osmosis (RO) to spererate milk solids and water.  

This process must be able to seperate 50% of water from milk.  I am having trouble finding the calculations for the size, temperature, pressure differences, etc.  

Can anyone here help me with giving me some calculations.

Thanks! smile

RE: Reverse Osmosis

I'm guessing you wouldn't use RO for that.  

I'd start with looking at the size of the colloidal partical you want to remove and then select a membrane.

Possibly UF followed by RO?

RE: Reverse Osmosis

(OP)
Thanks for the tip. I thought of doing a Centrifugation of milk then proceeding it to RO. any thoughts on that?

I'm having a bit of trouble with the calculations aswell

RE: Reverse Osmosis

What do you want to use the permeate for? And were can you send the reject?

1.  Call someone who has experience designing these systems.  An off the self R.O. system from Siemens/GE/Aquatech can be headaches down the road.  In dairy plants organics will be your main problem and you will be cleaning all the time if not designed properly.  I would recommend calling Ken Pandya from AWTS.  He's a strong engineer.

2.  Consult the Dow R.O. manual chapter 3. p. 70 - 99.


3.  Obtain a particle analysis down to .2 micron, a water analysis (most COW water/dairy water is low in hardness), several SDI (15 min) test.

4.  Then determine your flow rates.  Also design for low flux rates of 10 gfd and plan for high feed spacer membranes.

If you don't understand these terms; you probably shouldn't be designing the system.

RE: Reverse Osmosis

Hello madchemist11.
The RO of milk is a common application, and has been applied for many years in the dairy industry. One needs to use the appropriate system design as well as the right sanitary membrane design.

Please bear in mind that the membranes need to be cleaned every 10 hours, and that the life of the membranes are about 2 years. The best way to run this is cold.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close