Title

Water quantity and quality assessment on a tertiary treatment wetland in a tropical climate

Document Type

Journal Article

Publisher

I W A Publishing

Place of Publication

United Kingdom

School

School of Engineering

RAS ID

20316

Comments

Originally published as: Sun, G., Saeed, T., Zhang, G., & Sivakugan, N. (2015). Water quantity and quality assessment on a tertiary treatment wetland in a tropical climate. Water Science and Technology, 71(4), 511-517. Available here

Abstract

This study aimed to assess the quantity and quality of water in a surface flow constructed wetland in Australia's far north Queensland. Owing to tropical climate in the region, the wetland provided dual functions: retention of a treated wastewater for zero discharge during the dry season and tertiary treatment prior to discharge during the wet season. Rainfall data, permeability of wetland soil, evaporation, inflow and outflow were analysed in a water balance analysis; the results showed that based on a 72-year-average rainfall pattern, daily wastewater inflow of 85 m3/d is the maximum this wetland can cope with without breaching its discharge certificate. In water quality analysis, the K-C∗model was used to predict changes of biochemical oxygen demand (BOD, suspended solids (SS), total nitrogen (TN), total phosphorus (TP) and faecal coliforms (FC) in the wetland. Model predictions were compared with field sampling results. It was found that the wetland was effective in removing FC (>99.9%), TN (70.7%) and TP (68.2%), for which the predictions by the K-C∗model were consistent with field testing results. However, signi ficant disparities between the predictions and testing results were found for BOD and SS. A revised K-C∗equation was proposed to account for the internal generation of organics in constructed wetlands with a long retention time

DOI

10.2166/wst.2014.479

Access Rights

Not open access

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