What is the Alkalinity in the MBR? Nitrification removes alkalinity and even with denitrification only 2/3 is recovered.

"During nitrification , 7.14 mg of alkalinity as CaCO3 is destroyed for every milligram of ammonium ions oxidized. ... After complete nitrification , a residual alkalinity of 70 to 80 mg/L as CaCO3 in the aeration tank is desirable. If this alkalinity is not present, then alkalinity should be added to the aeration tank" - CWEA-WEF June,25 2015

Abstract

p -Cresol at 17 mg l−1 in a nitrifying culture inhibited by 70% nitrate formation whereas at 10 mg l−1 there was no effect. p -Cresol at 220, 470, and 910 mg l−1 was converted to intermediates after adaptation times of 8 h, 24 h, and 40 h, respectively. The sludge recovered 44% of its activity after transformation of p -cresol.

Tolerance of nitrifying sludge to p -cresol

• A.-C. Texier &
• J. Gomez 

Biotechnology Letters volume 24 , pages321–324(2002)Cite this article

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