Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water

J. A. Vidales-Contreras, Charles P Gerba, M. M. Karpisack, H. Rodríguez-Fuentes, C. Chaidez-Quiroz, E. Olivares-Sáenz

Research output: Contribution to journalArticle

Abstract

The performance of a surface flow wetland system used to treat activated sludge effluent and filter backwash water from a tertiary treatment facility was evaluated. Samples were collected before and after vegetation removal from the system which consists of two densely vegetated settling basins (0.35 ha), an artificial stream, and a 3-ha surface flow wetland. Bulrush (Scripus spp.) and cattail (Typha domingensis) were the dominant plant species. The average inflow of chlorinated secondary effluent during the first two months of the actual study was 1.9 m3 min-1 while the inflow for backwash water treatment ranged from 0.21 to 0.42 m3 min-1. The system was able to reduce TSS and BOD5 to tertiary effluent standards; however, monitoring of chloride concentrations revealed that wetland evapotranspiration is probably enriching pollutant concentrations in the wetland outflow. Coliphage removal from the filter backwash was 97 and 35% during 1999 and 2000, respectively. However, when secondary effluent entered the system, coliphage removal averaged 65%. After vegetation removal, pH and coliphage density increased significantly (p<0.05) at the outlet of the wetland. This study showed that surface flow wetlands are an alternative technology for TSS, BOD5, and turbidity removal from both secondary or backwash water. However, growth of bacteria populations or recovering of injured bacteria may occur.

Original languageEnglish (US)
Pages (from-to)375-384
Number of pages10
JournalTropical and Subtropical Agroecosystems
Volume14
Issue number2
StatePublished - May 2011

Fingerprint

water filters
constructed wetlands
Wetlands
overland flow
constructed wetland
effluents
wetlands
wetland
Coliphages
coliphages
effluent
filter
Water
Typhaceae
water
inflow
Typha domingensis
Bacteria
vegetation
bacterium

Keywords

  • Backwash water
  • BOD5
  • Constructed wetlands
  • Microbial indicators
  • TSS
  • Wastewater

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Ecology

Cite this

Vidales-Contreras, J. A., Gerba, C. P., Karpisack, M. M., Rodríguez-Fuentes, H., Chaidez-Quiroz, C., & Olivares-Sáenz, E. (2011). Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water. Tropical and Subtropical Agroecosystems, 14(2), 375-384.

Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water. / Vidales-Contreras, J. A.; Gerba, Charles P; Karpisack, M. M.; Rodríguez-Fuentes, H.; Chaidez-Quiroz, C.; Olivares-Sáenz, E.

In: Tropical and Subtropical Agroecosystems, Vol. 14, No. 2, 05.2011, p. 375-384.

Research output: Contribution to journalArticle

Vidales-Contreras, JA, Gerba, CP, Karpisack, MM, Rodríguez-Fuentes, H, Chaidez-Quiroz, C & Olivares-Sáenz, E 2011, 'Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water', Tropical and Subtropical Agroecosystems, vol. 14, no. 2, pp. 375-384.
Vidales-Contreras JA, Gerba CP, Karpisack MM, Rodríguez-Fuentes H, Chaidez-Quiroz C, Olivares-Sáenz E. Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water. Tropical and Subtropical Agroecosystems. 2011 May;14(2):375-384.
Vidales-Contreras, J. A. ; Gerba, Charles P ; Karpisack, M. M. ; Rodríguez-Fuentes, H. ; Chaidez-Quiroz, C. ; Olivares-Sáenz, E. / Performance of a surface flow constructed wetland system used to treat secondary effluent and filter backwash water. In: Tropical and Subtropical Agroecosystems. 2011 ; Vol. 14, No. 2. pp. 375-384.
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