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Volume 38 Issue 8
Nov.  2020
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2020  >  38(8): 142-146
ZHOU Zhi-cai. EFFECT ASSESSMENT OF SPONGE CITY CONSTRUCTION IN THE INTERNATIONAL ECO-BUSINESS DISTRICT IN SONGJIANG DISTRICT IN SHANGHAI BASED ON SWMM[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 167-173. doi: 10.13205/j.hjgc.202008028
Citation: CHEN Yun-fan, QIAN Meng-meng, KANG Zi-wei, DING Jia-hui, CHEN Jing, JIA Wen-lin. START-UP OF A COMPLETELY AUTOTROPHIC NITROGEN REMOVAL OVER NITRITE PROCESS ENHANCED BY MAGNETIC FIELD[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 142-146. doi: 10.13205/j.hjgc.202008024
shu

START-UP OF A COMPLETELY AUTOTROPHIC NITROGEN REMOVAL OVER NITRITE PROCESS ENHANCED BY MAGNETIC FIELD

doi: 10.13205/j.hjgc.202008024

  • School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, China

  • Received Date: 2019-05-05
    Abstract
  • In order to enhance the nitrogen removal performance of completely autotrophic nitrogen removal over nitrite (CANON) process, membrane bioreactors (MBRs) were constructed to start the CANON process in this study. Static magnetic field (MF) was applied to enhance the CANON process, and the nitrogen removal performance and the mechanism were analyzed. The results showed that MF with suitable intensity enhanced the nitrogen removal rate (NRR) and shortened the start-up period during the CANON process. The average NRR during the late period reached 49.5 g/(m3·d) with the exposure to MF, which was 1.45 times higher than the control. At low temperature, the CANON process could keep high activity with the exposure to MF, and the average NRR was 2.88 times of the control. The MF could stimulate the synthesis and secretion of extracellular polymer (EPS) of sludge, and enhance the contents of protein in EPS. Meanwhile the zeta potential of the mixture in the reactor decreased due to the application of MF, which was conducive to the aggregation of the activated sludge. The oxygen concentration gradient in the flocs favored the coexistence of different microorganisms during CANON process, resulting in the enhancement of nitrogen removal.
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