Effect of nitrite on aerobic phosphate uptake by phosphate accumulating organisms

• Published in: Huanjing kexue Vol. 27; no. 8; p. 1574
• Main Authors: Li, Ling-Ling, Zheng, Xi-Lai, Wu, Jun-Wen, Li, Mei, Zhao, Shu-Mei
• Format: Journal Article
• Language: Chinese
• Published: China 01.08.2006
• Subjects: Bacteria, Aerobic - drug effects; Bacteria, Aerobic - growth & development; Bacteria, Aerobic - metabolism; Biodegradation, Environmental - drug effects; Bioreactors - microbiology; Dose-Response Relationship, Drug; Nitrites - metabolism; Nitrites - pharmacology; Phosphates - metabolism; Waste Disposal, Fluid - methods
• ISSN: 0250-3301

Effect of nitrite at various concentration levels on aerobic phosphate uptake was investigated through a series of batch experiments. Furthermore, the effect of nitrite accumulated in the process of nitrification on aerobic phosphate uptake was studied in saline wastewater treatment. The results show that NO2(-) -N concentration of 4 mg/L inhibits aerobic phosphate uptake by phosphate uptake by phosphate accumulating organisms (PAO) and phosphate uptake rate decreases 8%. Exposure to higher nitrite concentration levels inhibits aerobic phosphate uptake severely. At NO2(-) -N concentration of 15 mg/L, phosphate uptake rate decreases 61%. The toxic effect of nitrite is presumed to be linked with free nitrous acid (FNA). Significant inhibition on aerobic phosphate uptake appeared at 0.000 2 mg/L of FNA concentration. The inhibiting effect of nitrite is found to occur only when nitrite is present. The ability of accumulating phosphate resumes afternitrite is no longer present. During the process of nitrification