Abstract
Field testing of a proprietary stormwater treatment device was undertaken over 14 months at a site located in Nambour, South East Queensland. Testing was undertaken to evaluate the pollution removal performance of a Stormceptor® treatment train for removing total suspended solids (TSS), total nitrogen (TN) and total phosphorous (TP) from stormwater runoff. Water quality sampling was undertaken using natural rainfall events complying with an a priori sampling protocol. More than 59 rain events were monitored, of which 18 were found to comply with the accepted sampling protocol. The efficiency ratios (ER) observed for the treatment device were found to be 83% for TSS, 11% for TP and 23% for TN. Although adequately removing TSS, additional system components, such as engineered filters, would be required to satisfy minimum local pollution removal regulations. The results of dry weather sampling tests did not conclusively demonstrate that pollutants were exported between storm events or that pollution concentrations increased significantly over time.
Highlights
The increase in impervious surface area associated with urban development has resulted in increased stormwater runoff volumes and increased pollution loads for downstream receiving waters [1,2]
The evaluation of proprietary stormwater treatment devices has been performed for decades internationally and appears to be gaining momentum in Australia
This paper has detailed the evaluation and testing protocol implemented on a Class 1 Stormceptor at one monitoring site in Queensland, Australia
Summary
The increase in impervious surface area associated with urban development has resulted in increased stormwater runoff volumes and increased pollution loads for downstream receiving waters [1,2]. A wide range of best management practices (BMPs) have been implemented over the last few decades to remove pollution from stormwater runoff [4,5,6,7]. These include sediment basins, swales, rain gardens, wetlands and biofilters. TThhee ssttoorrmmwwaatteerr ttrreeaattmmeenntt ttrraaiinn ((FFiigguurree 22)) iinncclluuddeedd aann uunnddeerrggrroouunndd rraaiinnwwaatteerr ttaannkk ((rrooooff wwaatteerr ccaappttuurree aanndd rreeuussee)),, gguullllyy ppiittss aanndd ssuurrffaaccee ddrraaiinnss,, aass wweellll aass tthhee PPSSTTDD. Maintenance includes sediment removal from the gross pollutant trap (GPT) section of the unit via a suction hose. No maintenance of the unit was required or undertaken during the 14-month study test period
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