Dave Dickey Forum Moderator 292 Posts
Re: Pilot plant digester mixing13 March 2008 at 1:29pm
The answers to all of these questions appears to be the reason for the Pilot Plant Digester. If someone could easily answer these questions, the pilot plant would not be needed. The pilot plant digester should be designed and constructed in a manner such that the nozzle diameter and pump rate can be changed easily to test what the minimum injection velocity and flow rate is. The nozzles must be easily relocated to test the effects of nozzle angle, injection height, location, etc. Baffles may be necessary to avoid bypassing of the main digester flow.
The real question is how do you scale-up results from the pilot plant size to the full-scale digester. The answer to the scale-up question, must also come from the pilot plant. Tests need to establish whether maintaining jet velocity is sufficient to maintain performance or whether flow rate has a more significant effect. Particle size and size distribution may have an effect on the answer to the scale-up question since concentration if a factor on both flow and particle suspension.
I would like to continually mix 4% DS anearobic sludge in a 1cu.m pilot plant digester(h/d aspect ratio 1.3/1), using an external pump system with 2 nozzle injections. Sludge throughput is 3l/hour. @ 37degC. Max. solids size = 10mm. What would be minimum injection velocity and flow rate required? Any other requirements i.e nozzle angles, nozzle, injection height, baffles, etc.?
Have an insight or suggestion?
Login or register to post a comment.