2013 Volume 7 Issue 4
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Yang Yahong, Peng Dangcong, Li Lei, Zheng Yangguang, Han Yun. Pilot study on flow characteristics of a variable-velocity oxidation ditch with fine bubble[J]. Chinese Journal of Environmental Engineering, 2013, 7(4): 1336-1340.
Citation: Yang Yahong, Peng Dangcong, Li Lei, Zheng Yangguang, Han Yun. Pilot study on flow characteristics of a variable-velocity oxidation ditch with fine bubble[J]. Chinese Journal of Environmental Engineering, 2013, 7(4): 1336-1340.
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Pilot study on flow characteristics of a variable-velocity oxidation ditch with fine bubble

  • 1.

    School of Environmental and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China

  • 2.

    College of Civil Engineering, Lanzhou University of Techchnology, Lanzhou 730050, China

  • Received Date: 29/11/2012
    Accepted Date: 23/10/2012
    Available Online: 09/04/2013
    Fund Project:
  • Oxidation ditch process with same ditch width and flow velocities was widely applied to process of nitrogen and phosphorus removal, which caused anoxic and fine bubble aeration sections with the same velocities based on flow balance. However, the same high velocities in bubble aeration section with anoxic section couldn’t meet energy-saving. To explore fine bubble oxidation ditch with variable velocities and its feasibility, a novel pilot-scale variable speed oxidation ditch was established and its flow-velocity distribution were measured along the ditch. Result showed that the average velocities of 0.4 m and 1.2 m channel widths were about 0.15 m/s and 0.07 m/s, respectively being slightly less than the theory ratio 3∶1 and variable velocities in oxidation ditch was feasible.It also showed that separating activated sludge with water hand never happened by through measuring sludge settlement ratios and SS at points tending to settle and observing for a long time.
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Pilot study on flow characteristics of a variable-velocity oxidation ditch with fine bubble

  • Received Date: 29/11/2012
  • Accepted Date: 23/10/2012
  • Available Online: 09/04/2013
Fund Project:

Abstract: Oxidation ditch process with same ditch width and flow velocities was widely applied to process of nitrogen and phosphorus removal, which caused anoxic and fine bubble aeration sections with the same velocities based on flow balance. However, the same high velocities in bubble aeration section with anoxic section couldn’t meet energy-saving. To explore fine bubble oxidation ditch with variable velocities and its feasibility, a novel pilot-scale variable speed oxidation ditch was established and its flow-velocity distribution were measured along the ditch. Result showed that the average velocities of 0.4 m and 1.2 m channel widths were about 0.15 m/s and 0.07 m/s, respectively being slightly less than the theory ratio 3∶1 and variable velocities in oxidation ditch was feasible.It also showed that separating activated sludge with water hand never happened by through measuring sludge settlement ratios and SS at points tending to settle and observing for a long time.

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