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Nitrogen leaching losses from a wastewater land application system
Runbin Duan1, Clifford B Fedler, Christopher D Sheppard
1Department of Civil and Environmental Engineering, Texas Tech University, Lubbock, Texas 79409, USA. duanttu@gmail.com
Summary
Nitrogen leaching in wastewater systems was studied. The research found no groundwater contamination risk, indicating effective nitrogen removal through a mass balance model.
Area of Science:
- Environmental Science
- Soil Science
- Water Resource Management
Background:
- Nitrogen leaching from wastewater land application poses a risk to groundwater quality.
- Measuring nitrogen leaching under field conditions is crucial for assessing this risk.
- Limited studies have quantified nitrogen leaching in municipal wastewater systems.
Purpose of the Study:
- To develop and validate a conceptual nitrogen mass balance model for a wastewater land application system.
- To quantify nitrogen leaching (total N, nitrate-N, ammonia-N) under field conditions.
- To assess the potential for groundwater contamination at the Littlefield, Texas site.
Main Methods:
- Development of a conceptual nitrogen mass balance model.
- Field monitoring of nitrogen forms in leachate from October 2005 to September 2007.
- Statistical analysis using linear regression to correlate applied and leached nitrogen.
Main Results:
- Leachate concentrations of total nitrogen and nitrate-nitrogen were below the 10 mg/L threshold.
- No potential for nitrogen contamination to groundwater was detected during the study period.
- High R2 values (0.918-0.966) demonstrated strong correlations between applied and leached nitrogen forms.
Conclusions:
- The nitrogen mass balance approach effectively managed nitrogen removal at the wastewater land application site.
- Denitrification is a significant nitrogen removal process, particularly during drier winter and spring seasons.
- While organic nitrogen can leach, the overall system demonstrated successful nitrogen management, preventing groundwater contamination.
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