Volume 8 Issue 1
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LIU Yixuan, JIANG Yuanyuan, MEI Hong, WAN Duanji, YU Pan. Effects of different renewal rates on continuous domestic wastewater treatment by Chlorella zofingiensis[J]. Journal of Environmental Engineering Technology, 2018, 8(1): 71-77. doi: 10.3969/j.issn.1674-991X.2018.01.009
Citation: LIU Yixuan, JIANG Yuanyuan, MEI Hong, WAN Duanji, YU Pan. Effects of different renewal rates on continuous domestic wastewater treatment by Chlorella zofingiensis[J]. Journal of Environmental Engineering Technology, 2018, 8(1): 71-77. doi: 10.3969/j.issn.1674-991X.2018.01.009
shu

Effects of different renewal rates on continuous domestic wastewater treatment by Chlorella zofingiensis

doi: 10.3969/j.issn.1674-991X.2018.01.009

  • 1. College of Civil and Environmental Engineering, Hubei University of Technology, Wuhan 430068, China

  • 2. Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization,Hubei University of Technology, Wuhan 430068, China

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  • Corresponding author: Hong MEI E-mail: hongmei_0207@126.com
  • Received Date: 2017-07-30
  • Publish Date: 2018-01-20
    Abstract
  • In order to optimize the condition of continuous domestic wastewater treatment by Chlorella zofingiensis (C. zofingiensis) and to improve the treatment efficiency, the effects of different renewal rates on the treatment efficiency were studied. Six different renewal rates (0.20, 0.30, 0.40, 0.50, 0.60 and 0.70 d -1) were set for the experiment using C. zofingiensis to continuously treat domestic wastewater in the column photo bio-reactor. Through the experiments, the parabolic regression curve of the renewal rate, the cell yield, nitrogen and phosphorus consumption rate were established to find the optimal range of renewal rate. The results showed that the renewal rate had significant effects on the growth of C. zofingiensis and the treatment of pollutants. During the continuous reaction, with the increase of renewal rate, the algal cells concentration at steady state decreased gradually, while the effluent nutrients concentration increased. There is a parabolic regression relationship, between the renewal rate (x) and the cell yield (P) respectively, the nitrogen consumption rate (y1), the phosphorus consumption rate (y2) :P=-1.179(x-0.45) 2+0.026(x-0.45)+0.239(R 2=0.990 9), y1=-66.79(x-0.45) 2+2.55(x-0.45)+10.26(R 2=0.936 7), y2=-19(x-0.45) 2+1.963(x-0.45)+2.913(R 2=0.924 5). The determination coefficient R 2 of three curves is high, and the extreme values are all 0.45 d -1 which can be considered as the optimal renewal rate.

     

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