Abstract
A sequencing batch reactor was employed to treat the acrylic fiber wastewater. The dissolved oxygen and mixed liquor suspended solids were 2-3 and 3,500-4,000mg/L, respectively. The results showed ammonium oxidizing bacteria (AOB) had superior growth rate at high temperature than nitrite oxidizing bacteria (NOB). Partial nitrification could be obtained with the temperature of 28°C. When the pH value was 8.5, the nitrite-N accumulation efficiency was 82%. The combined inhibitions of high pH and free ammonium to NOB devoted to the nitrite-N buildup. Hydraulic retention time (HRT) was a key factor in partial nitrification control, and the optimal HRT was 20h for nitrite-N buildup in acrylic fiber wastewater treatment. The ammonium oxidation was almost complete and the transformation from nitrite to nitrate could be avoided. AOB and NOB accounted for 2.9 and 4.7%, respectively, corresponding to the pH of 7.0. When the pH was 8.5, they were 6.7 and 0.9%, respectively. AOB dominated nitrifying bacteria, and NOB was actually washed out from the system.
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