Elimination of estrogens and estrogenic activity from sewage treatment works effluents in subsurface and surface flow constructed wetlands

Hai Liang Song, Xiao Li Yang, Kazunori Nakano, Munehiro Nomur, Osamu Nishimur, Xian Ning Li

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

The effluents discharged from sewage treatment works (STWs) are major sources of environmental estrogens, which poses an urgent need to explore appropriate techniques for effluent-polishing. In light of the debate concerning the effectiveness of constructed wetlands (CW) for the elimination of estrogens, the present study evaluated and compared the performance of two basic types of CW, free water surface (FWS) and subsurface flow (SSF) systems. Two FWS and two SSF field CW mesocosms were fed continuously with an STW effluent. All the mesocosms provided an effective elimination of estrogens and estrogenic activity. Unexpectedly, the performance of FWS mesocosms was not inferior to that of SSF mesocosms. Additional shading experiments demonstrated that the presence of filamentous green algae along with the sunlight enhanced the removal of estrogens and estrogenic activity in FWS mesocosms, enabling FWS mesocosms to perform comparably to SSF mesocosms. Microbial inhibition tests further indicated that Spirogyra sp. itself rather than algae-attached bacteria played an important role in the removal of estrogen and estrogenic activity.

Original languageEnglish
Pages (from-to)600-614
Number of pages15
JournalInternational Journal of Environmental Analytical Chemistry
Volume91
Issue number7-8
DOIs
Publication statusPublished - 2011 Jun

Keywords

  • Constructed wetland
  • Estrogen
  • Filamentous green algae
  • Free water surface flow
  • Subsurface flow

ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Chemistry
  • Water Science and Technology
  • Waste Management and Disposal
  • Soil Science
  • Pollution
  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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