Use of dewatered sludge as microbial inoculum of a subsurface wastewater infiltration system: effect on start-up and pollutant removal

Authors

  • Yingying Jiang College of Life Science, Shenyang Normal University, 253, Huanghe Street, Shenyang 110034, China
  • Yafei Sun College of Life Science, Shenyang Normal University, 253, Huanghe Street, Shenyang 110034, China
  • ing Pan College of Life Science, Shenyang Normal University, 253, Huanghe Street, Shenyang 110034, China
  • Yang Zhang College of Life Science, Shenyang Normal University, 253, Huanghe Street, Shenyang 110034, China

DOI:

https://doi.org/10.4314/wsa.v43i4.07

Keywords:

subsurface wastewater infiltration system, dewatered sludge, start-up, inoculum

Abstract

Brown earth–based subsurface wastewater infiltration systems (SWISs) inoculated with/without dewatered sludge were constructed and operated under the same conditions to boost the application of SWIS in brown soil areas. Start-up period of SWIS with dewatered sludge was 28 days, 12 days shorter than that of SWIS without dewatered sludge. COD, NH3-N and TN removal efficiencies of dewatered sludge as microbial inoculum for SWIS were higher than that of SWIS without dewatered sludge under hydraulic loading rates (HLR) of 0.04, 0.07, 0.1 and 0.13 m3·m−2·d−1. Effluent concentrations of COD, NH3-N and TN in the SWIS inoculated with dewatered sludge were 44.51±4.13, 7.35 ± 0.24 and 14.03 ± 0.31 mg·L−1 under HLR of 0.13 m3·m−2·d−1, which were simultaneously lower than Chinese criteria for water discharge from municipal wastewater treatment plants. The number of bacteria, nitrifying bacteria and denitrifying bacteria in dewatered sludge as microbial inoculum for SWIS were higher than that in SWIS without dewatered sludge under the same HLR. The results will be helpful in promoting the application of dewatered sludge as microbial inoculum in brown earth–based SWISs for the purpose of shortening start-up period, effecting high levels of pollutant removal and recycling waste.

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Published

2017-10-31

Issue

Vol. 43 No. 4 October (2017): Water SA

Section

Research paper

License

Copyright (c) 2017 Yingying Jiang, Yafei Sun, ing Pan, Yang Zhang

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

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How to Cite

Yingying Jiang (2017) “Use of dewatered sludge as microbial inoculum of a subsurface wastewater infiltration system: effect on start-up and pollutant removal”, Water SA, 43(4 October). doi:10.4314/wsa.v43i4.07.