Thanks for an instant responce !!
1.The pH of the Distillery Spentwash is around 4. But the pH
of the Raw effluent is adjusted to 6 to 6.5 before it enters the UASB system by
using the Biocarbonate Alkalinity from the treated Effluent(Which is recycled in
a buffer Tank , where it gets mixed with the raw Effluent) and an external
addition of Lime to the Buffer Tank.
2. We are not using Proprietory Bactria or Organic Media
3. I didn't understant what you mean by UASB as a Dilute
Process.Would be grateful if you could explain.
The COD of the Distillery Spentwash is 100000
mg/L. The organic Concentration entering the reactor after dilution and mixing
with the recycled flow is 30000- 40000 mg/L(COD) !!!!
Thanks again for the responce.,
----- Original Message -----
Sent: Friday, December 07, 2001 10:53
Subject: Re: DIG-L: Ammonia in
Chances are the pH is the determination factor of the excess
Are you using proprietory bacteria?
Organic media cells for
UASB is a very dilute process and the absence of H2S is not surprising; but
this is dependant on the throughflow rate of your wastes.
A low pH will deliver excess ammonia residues.
Just my two bobs worth
I operate an anaerobic UASB system for the treatment of
700m3/day Cane molasses based Distillery Spentwash.This
plant has been in operation for the last 6 years.One of the UASB ractors was
recently opened for the repairs of the feed distribution Network. Besides
many interesting findings , one puzzling observation was that, throughout
the period when the Anaerobic Biomass was being removed from the reactor(i.
e. for about 3 weeks) , a very strong odour of Ammonia was persistent
in the reactor. Actually H2S smell was expected as the Spentwash
contains high concentrations of sulfates and the Anaerobic Biomass contains
Sulfate Reducing Bacteria. But No H2S smell was
encountered. Can somebody please throw some light
on the possible reasons for the presence of this strong Ammonia smell
?? P.S. 1.No external Nitrogen was being added as
the TKN concentration in the distillery spentwash is in the range of
1000 to 1500 mg/L. 2. Moderate quantities of yeast may have accumulated in
the reactor(Source: Distillery Spentwash). Thanks., Avadhut