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Simulating Woodchip Bioreactor Performance Using a Dual-Porosity Model.

Dan B Jaynes, Tom B Moorman, Timothy B Parkin

Journal of Environmental Quality

|May 3, 2016

Summary

This summary is machine-generated.

A dual-porosity model accurately simulates nitrate (NO) transport and denitrification in woodchip bioreactors. This model enhances understanding of nutrient removal in these systems.

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Area of Science:

Environmental Engineering
Hydrology
Biogeochemistry

Background:

Woodchip bioreactors are used for denitrification, but quantitative models for their performance are lacking.
Understanding nitrate (NO) transport and transformation is crucial for optimizing bioreactor efficiency.

Purpose of the Study:

To test a dual-porosity transport model for simulating nitrate (NO) fate and transport in woodchip bioreactors.
To quantitatively assess the denitrification performance of a woodchip bioreactor over two years.

Main Methods:

A dual-porosity model within HYDRUS was calibrated using a bromide (Br) tracer experiment.
The calibrated model was used to simulate nitrate (NO) transport and denitrification over two years.
Denitrification rates (zero- or first-order) and temperature dependence were fitted to the NO data.

Main Results:

The dual-porosity model accurately described nitrate (NO) transport and denitrification.
The bioreactor removed 38% of incoming nitrate (NO) in 2013 and 49% in 2014.
Both zero- and first-order denitrification rate models provided equally good fits to the data.

Conclusions:

The dual-porosity model is a robust and promising approach for simulating nitrate (NO) fate and transport in woodchip bioreactors.
The model provides quantitative insights into denitrification processes within these systems.
Consistent model parameters suggest the approach is reliable for predicting bioreactor performance.