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Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff

Vegetated Treatment Systems for Removing Contaminants Associated with Surface Water Toxicity in Agriculture and Urban Runoff

Published on: May 15, 2017

Subsurface wastewater infiltration systems for nitrogen pollution control.

Xulun Zhou¹, Haibo Li¹, Ang Wang^2,3,4

¹School of Resources and Civil Engineering, Northeastern University, Shenyang, China.

Water Environment Research : a Research Publication of the Water Environment Federation

|June 17, 2024

Summary

Subsurface wastewater infiltration systems (SWIS) effectively remove nitrogen through biological processes. Optimizing operational parameters and employing strategies like aeration can enhance treatment and reduce nitrous oxide emissions.

Keywords:

N pollution N removal performance intensification N2O emission domestic sewage subsurface wastewater infiltration system

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Area of Science:

Environmental Engineering
Wastewater Treatment Technologies
Nitrogen Removal Mechanisms

Background:

Subsurface wastewater infiltration systems (SWIS) are cost-effective for sewage treatment.
A comprehensive understanding of nitrogen (N) removal mechanisms and optimization in SWIS is lacking.
SWIS performance depends on hydraulic, biological, and substrate properties.

Purpose of the Study:

To summarize N transformation mechanisms in SWIS.
To delineate the impact of operational parameters on N removal efficiency.
To identify strategies for enhancing pollutant removal and reducing N2O emissions.

Main Methods:

Review of N transformation mechanisms in SWIS.
Analysis of operational parameters affecting N removal.
Evaluation of enhancement strategies for SWIS.

Main Results:

Optimal operation involves a 1:1 wet-dry ratio and 8-10 cm/day hydraulic loading rate.
Organic load management is crucial for balancing treatment and N2O emission.
Strategies like artificial aeration, electron donor supply, and structural design improve N removal.

Conclusions:

Biological nitrification and denitrification are key N removal processes in SWIS.
Reducing N2O to N2 mitigates global warming potential.
Improved SWIS design and management are essential for controlling N pollution and optimizing co-benefits.