Analysis of trends in water quality: Constructed wetlands in metropolitan Taipei

B. Y. Cheng, T. C. Liu, G. S. Shyu, T. K. Chang, W. T. Fang

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Meandering through the most densely populated metropolitan areas of Taipei, Taiwan, the Danshui River and its tributaries have undergone the construction of 14 wetlands since 2004, as a means to improve water quality. This study was conducted to examine the functional capabilities associated with treating non-point source pollution through these riparian wetlands. Trend analysis was used to differentiate dissolved oxygen, biochemical oxygen demand, suspended solids, ammonia, and Escherichia coli, among 13 sampling sites using both functions of a Mann-Kendall test and a seasonal Mann-Kendall test. The results show that water quality in Taipei metropolitan rivers has been improving since increasing the number of constructed wetlands and connecting households to the public sewage system. The concentration of pollutants such as those influencing biochemical oxygen demand have gradually declined in drought seasons because riparian wetlands contribute a base flow to dilute riverine pollutants. This paper indicates that the creation of treatment systems influences dissolved oxygen conditions at the municipal scale, suggesting that constructed wetlands could stabilize water quality during extreme hydrological events and improve water quality particularly in times of drought.

Original languageEnglish
Pages (from-to)2143-2150
Number of pages8
JournalWater Science and Technology
Volume64
Issue number11
DOIs
Publication statusPublished - 2011 Dec 26

Fingerprint

Wetlands
constructed wetland
Water quality
water quality
wetland
biochemical oxygen demand
Biochemical oxygen demand
Drought
dissolved oxygen
Dissolved oxygen
drought
Rivers
pollutant
trend analysis
nonpoint source pollution
baseflow
river
metropolitan area
tributary
Sewage

Keywords

  • Danshui River
  • Mann-Kendall test
  • Riparian wetland
  • Taiwan

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

Cite this

Analysis of trends in water quality : Constructed wetlands in metropolitan Taipei. / Cheng, B. Y.; Liu, T. C.; Shyu, G. S.; Chang, T. K.; Fang, W. T.

In: Water Science and Technology, Vol. 64, No. 11, 26.12.2011, p. 2143-2150.

Research output: Contribution to journalArticle

Cheng, B. Y. ; Liu, T. C. ; Shyu, G. S. ; Chang, T. K. ; Fang, W. T. / Analysis of trends in water quality : Constructed wetlands in metropolitan Taipei. In: Water Science and Technology. 2011 ; Vol. 64, No. 11. pp. 2143-2150.
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