WWTP nitrogen abatement

Question

Hi all
Is the effluent conductivity impacting nitrogen abatement in a WWTP ?
Much appreciated!

AGGASIT DAD · Answer

Conductivity relate with TDS if N have shown in Organic and Inorganic forms these will relate directly to conduct. For my point of view, I use AD firstly to change all N to be NH3 and NH4+ then using Anoxic or Annamox to remove all N to N2 by using  AS clearify by V=S/t.
So sludge will sterling down and clear water will be discharged as the design.  For Physical you can use NH3 stripping as well. For using Mg(OH)2, this is the new way and I will try on my customer plant.

Mark Milne · Answer

What kind of system are you running? Bio ammonia removal (nitrification) will use alkalinity and lower pH. Low alkalinity will inhibit ammonia removal. Many things can be used to increase alkalinity. I would also look up the Modified Ludzack - Ettinger (MLE) process, it can help recover about 2/3 of the alkalinity through denitrification.
As for chemicals to increase alkalinity, lime works but makes more sludge, sodium bicarbonate is nice to handle but takes a lot more, Magnesium products can make struvite, and NaOH is expensive.
Hope this hepls,
 
Mark

Mark B. Gingras · Answer

That is possible, but I would check you pH.  I have had very good results using Magnesium Hdroxide to stabilize pH.  Is is non- toxic and you cannot overfeed or hurt your activated sludge process.  It is the equivalent of "mil of magnesia".  I used the liqued, slurry form and all you need is a thank ith a good mixer to keep it in solution and a metering pump.  The chemical supplior rep will be able to determine your feed rate, so you don't overfeed and waste money.  Again, overfeeding will not harm your process.  Check out Hill Brother's, They were my supplier here is So California.  I highly recommend them!
 
Good luck,
Mark B. Gingras

Taxonomy