The acidification of primary sludge is an important measure to promote increased biological P elimination and denitrification at wastewater treatment plants. In laboratory experiments and at large-scale plants it has been found that the COD in the influent of biological treatment stages can be increased by 10–15% in the form of easily degradable carbonic acids. However, the operation of acidification thickeners leads to odour problems, as well as to considerable problems in terms of safety, in covered tanks.
Acidification of primary sludge to promote increased biological phosphorus elimination and denitrification
B. Teichgräber; Acidification of primary sludge to promote increased biological phosphorus elimination and denitrification. Water Sci Technol 1 May 2000; 41 (9): 163–170. doi: https://doi.org/10.2166/wst.2000.0196
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