Abstract
Objective: The goal of this work was to establish the quality conditions of the sediments retained in a constructed-wetland/storage-tank, which are to be used as productive material. Materials and methods: Sediments were collected every fortnight for five months in 2016, with sediment traps specially designed for the study case, to analyze particle size distribution, total organic carbon, and heavy metals concentrations. Sediment and hydrological data processing were performed using principal component analysis and multiple correspondence analysis. Results: The maximum measured concentrations were 110.80 mg/kg, 263.25 mg/kg, 798.85 mg/kg, and 3067 mg/kg for Cr, Cu, Pb, and Zn respectively; for total organic carbon was 20.6 mg. The sediment particles were considered thin (D50 < 150μm). Interesting relationships between rainfall and sediment characteristics were found. In shorter dry seasons, higher particle diameter, lower concentrations of heavy metals, and higher concentrations of total organic carbon were seen. Conclusions: Sediments are suitable for use in activities such as land remediation, vegetation of soils that are not for agricultural use, and as materials for ornamental and recreational areas. It is possible to use the sediments in embankments as tolerable soil for fillings of concrete structures and culverts in the core or foundation area.
Highlights
Sediments are part of the aquatic ecosystem, and their management is an environmental concern by the quantities dredged in different waterbodies as well as their disposal, relocation, or reuse [1]
Potential uses of stormwater runoff sediments retained in a constructed-wetland/storage-tank The objective of this work was to establish the quality conditions of the sediments retained in a constructed-wetland/storage-tank (CWST) to be used as a productive material
We collected the samples in beakers and carried them to the Pontificia Universidad Javeriana Bogotá (PUJ) water quality laboratory to undertake physical (Particle Size Distribution [PSD]) and chemical analyses (Total Organic Carbon [TOC] and Heavy Metal [HM] concentrations)
Summary
Sediments are part of the aquatic ecosystem, and their management is an environmental concern by the quantities dredged in different waterbodies as well as their disposal, relocation, or reuse [1]. Incorrect disposal may cause environmental problems [2]. For this reason, nowadays there is an increasing interest in knowing the risk associated with their management [3], [4]. Rainwater systems have structures that allow the entry of stormwater runoff into the drainage or treatment system. These structures have a significant effect on water, capturing the sediments and other pollutants that are washed from surfaces during rainfall, preventing them from being deposited in downstream sewerage in the receiving waters and as part of the stormwater treatment train concept [6]
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