Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6586700 | Chemical Engineering Journal | 2013 | 6 Pages |
Abstract
The nitrification inhibition induced by a metabolic uncoupler, 2,6-DCP was investigated in a sequence batch culture during the 60-day operation. Batch tests indicated that pH and temperature were the two key parameters affecting the nitrification performance. Significant inhibition of nitrification was observed on the initial addition of 2,6-DCP, then nitrification recovered to a higher level again. The extracellular polymeric substance (EPS) matrix functioned as a protective barrier for the bacteria inside sludge flocs to 2,6-DCP, resulting in the gradual recovery of nitrification efficiency. DGGE analysis showed the bacteria communities continued to evolve in the sludge over 60Â days. Moreover, the addition of 2,6-DCP increased the activated sludge activity and enhanced the dewatering ability of excess sludge. SOUR tests suggested that 2,6-DCP was much more toxic to autotrophic microorganisms than heterotrophic microorganisms. Thus, the application of metabolic uncoupler for excess sludge reduction should be very prudent.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Jun Zhang, Yu Tian, Wei Zuo, Lin Chen, Linlin Yin,