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Modulating phytoremediation: How drip irrigation system affect performance of active green wall and microbial

Luowen Lyu¹, Stephen Matheson², Robert Fleck³

¹Plants and Environmental Quality Research Group, School of Civil and Environmental Engineering, University of Technology Sydney, Australia.

Journal of Environmental Management

|October 4, 2024

Summary

This summary is machine-generated.

Low-flow drip irrigation in active green walls optimizes soil moisture and microbial communities for better air phytoremediation. This method enhances system performance by ensuring uniform moisture and preserving beneficial bacteria.

Keywords:

Active green walls Drip irrigation Gas chromatography-mass spectroscopy Microorganisms PLFA

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Area of Science:

Environmental Science
Microbiology
Horticultural Engineering

Background:

Active green walls utilize biofiltration and mechanical ventilation for air phytoremediation.
The impact of irrigation on soil moisture and microbial communities in these systems remains largely unstudied.

Purpose of the Study:

To investigate the influence of drip irrigation techniques on the performance of active green walls.
To assess how different irrigation flow rates affect substrate moisture, airflow, and microbial communities.

Main Methods:

A modular green wall system with 7 plant species and a substrate-only control was tested.
Measurements included water distribution, water-carrying capacity, substrate airflow, and microbial phospholipid fatty acids (PLFA).
Drip irrigation at low and high flow rates was compared.

Main Results:

Lower-speed drip irrigation reduced water consumption and improved moisture distribution compared to rapid systems.
High flow rates caused a water pathway phenomenon, leading to uneven moisture, especially with fibrous roots.
Drip irrigation did not alter overall microbial community composition but increased fungi by 6% and decreased bacteria by 56.67% at high flow rates.

Conclusions:

Low flow rate drip irrigation is more beneficial for active green wall performance, supporting both plant growth and microbial community composition.
Drip irrigation significantly affects substrate airflow and microbial density, crucial factors for effective air cleaning.