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Modeling the effects of parameter optimization on three bioretention tanks using the HYDRUS-1D model
Jiake Li1, Ruisong Zhao1, Yajiao Li2
1State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China, Xi'an University of Technology, Xi'an 710048, China.
Journal of Environmental Management
|March 28, 2018
Summary
Bioretention tanks with fly ash and sand media effectively reduce water and pollutant loads, especially under low inflow conditions and shorter return periods. Optimal performance was observed with 60 cm media thickness.
Area of Science:
- Environmental Engineering
- Water Resource Management
- Stormwater Management
Background:
- Bioretention systems are crucial for managing stormwater runoff and improving water quality.
- Investigating the operational effects of different artificial fillers in bioretention tanks is essential for optimizing their performance.
- Understanding the influence of various operational parameters on bioretention efficiency is key for effective design and implementation.
Purpose of the Study:
- To investigate the operational effects of different artificial fillers in three layered bioretention tanks.
- To simulate and analyze the performance of bioretention systems using HYDRUS-1D software.
- To identify key parameters influencing the water and pollutant reduction efficiency of bioretention tanks.
Main Methods:
- Conducted intermittent operation tests on three bioretention tanks with varying artificial filler layers (fly ash/sand, blast furnace slag, planting soil).
- Developed and validated HYDRUS-1D models based on experimental data, analyzing parameter sensitivity using the Morris screening method.
- Evaluated the impact of return period, media thickness, solute concentration, and inflow loads on operational effects.
Main Results:
- Return period, media thickness, and solute concentration significantly influenced bioretention operation effects, with model efficiencies (Nash-Sutcliffe) exceeding 0.85.
- Lower inflow loads and shorter return periods (1 year vs. 10 year) resulted in significantly better water and pollutant load reduction rates.
- Bioretention tanks using a fly ash and sand mixture demonstrated optimal reduction rates (69.33% for water, 83.08% for pollutants), with 60 cm media thickness showing the best performance.
Conclusions:
- Bioretention systems are effective in reducing water and pollutant loads, with performance influenced by operational parameters and filler material composition.
- A mixture of fly ash and sand is a highly effective artificial filler for enhancing bioretention performance.
- Optimizing media thickness and considering return periods and inflow concentrations are critical for maximizing the efficiency of bioretention systems in stormwater management.
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