SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2012, Vol. 20 ›› Issue (5): 1016-1023.

• ENERGY, RESOURCES AND ENVIRONMENTAL TECHNOLOGY • Previous Articles     Next Articles

The Short-term Effects of Temperature and Free Ammonia on Ammonium Oxidization in Granular and Floccular Nitrifying System*

WU Lei, PENG Yongzhen, MA Yong, LIU Xu, LI Lingyun, WANG Shuying   

  1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2011-02-22 Revised:2011-10-17 Online:2012-11-06 Published:2012-10-28
  • Supported by:
    Supported by the Project of Scientific Research Base and Scientific Innovation Platform of Beijing Municipal Education Commission;National Key Science and Technology Special Projects

The Short-term Effects of Temperature and Free Ammonia on Ammonium Oxidization in Granular and Floccular Nitrifying System*

吴蕾, 彭永臻, 马勇, 刘旭, 李凌云, 王淑莹   

  1. Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China
  • 通讯作者: PENGYongzhen,E-mail:pyz@tjut.edu.cn
  • 基金资助:
    Supported by the Project of Scientific Research Base and Scientific Innovation Platform of Beijing Municipal Education Commission;National Key Science and Technology Special Projects

Abstract: The short-term effects of temperature and free ammonia (FA) on ammonium oxidization were investigated in this study by operating several batch tests with two different partial nitrification aggregates, formed as either granules or flocs. The results showed that the rate of ammonium oxidation in both cultures increased significantly as temperature increased from 10 to 30℃. The specific ammonium oxidation rate with the granules was 2-3 times higher than that with flocs at the same temperature. Nitrification at various FA concentrations and temperatures combination exhibited obvious inhibition in ammonium oxidation rate when FA was 90 mg·L-1 and temperature dropped to 10℃ in the two systems. However, the increase in substrate oxidation rate of ammonia at 30℃ was observed. The results suggested that higher reaction temperature was helpful to reduce the toxicity of FA. Granules appeared to be more tolerant to FA attributed to the much fraction of ammonia oxidizing bacteria (AOB) and higher resistance to the transfer of ammonia into the bacterial aggregates, whereas in the floc system, the bacteria distributed throughout the entire aggregate. These results may contribute to the applicability of the nitrifying granules in wastewater treatment operated at high ammonium concentration.

Key words: nitrifying granules, temperature, free ammonia, ammonium oxidization, activation energy

摘要: The short-term effects of temperature and free ammonia (FA) on ammonium oxidization were investigated in this study by operating several batch tests with two different partial nitrification aggregates, formed as either granules or flocs. The results showed that the rate of ammonium oxidation in both cultures increased significantly as temperature increased from 10 to 30℃. The specific ammonium oxidation rate with the granules was 2-3 times higher than that with flocs at the same temperature. Nitrification at various FA concentrations and temperatures combination exhibited obvious inhibition in ammonium oxidation rate when FA was 90 mg·L-1 and temperature dropped to 10℃ in the two systems. However, the increase in substrate oxidation rate of ammonia at 30℃ was observed. The results suggested that higher reaction temperature was helpful to reduce the toxicity of FA. Granules appeared to be more tolerant to FA attributed to the much fraction of ammonia oxidizing bacteria (AOB) and higher resistance to the transfer of ammonia into the bacterial aggregates, whereas in the floc system, the bacteria distributed throughout the entire aggregate. These results may contribute to the applicability of the nitrifying granules in wastewater treatment operated at high ammonium concentration.

关键词: nitrifying granules, temperature, free ammonia, ammonium oxidization, activation energy