Title

Nutrient concentration in sediments accumulated in pre-treatment basins of urban LID technologies

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Article

Source Title

Water Science and Technology

Volume

79

Issue

5

First Page

1000

Last Page

1006

Publication Date

1-1-2019

Abstract

In this study, the contribution of pre-treatment basins of low impact development (LID) technologies to nutrient reduction performance was evaluated by understanding the distribution of nutrient in sediments accumulated in each system. The captured sediments were mostly silt to medium sand ranging from 9% to 92% of the sediments collected. Greater average N and P concentrations were found in silt particles amounting to 345 mg/kg and 696 mg/kg, respectively compared to sand and gravel. Although, N concentrations in accumulated sediments were found to be highly variable at different particle sizes (CV: 0.24 to 0.77) compared to P concentration (CV: 0.08 to 0.36) attributed to effective P treatment mechanism through deposition compared to complex nitrogen removal mechanisms. In addition, the difference between N and P concentrations of sediments collected in the pre-treatment basins of LID technologies and in-situ soil was attributed to the continuous pollutant input to the LID technologies during storm events. The study proved that pre-treatment basins of stormwater LID technologies reinforced the nutrient removal performances through sediment retention. The findings of this research may be used to design pre-treatment basins of LID technologies considering nutrients as a limiting factor. © IWA Publishing 2019 Water Science & Technology

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Digitial Object Identifier (DOI)

10.2166/wst.2019.033

Disciplines

Civil Engineering

Keywords

Sediments (Geology); Soil pollution; Silt; Nutrient pollution of water

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