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New sequential treatment for mature landfill leachate by cationic/anionic and anionic/cationic processes:

Mohammed J K Bashir¹, Hamidi Abdul Aziz, Mohd Suffian Yusoff

¹School of Civil Engineering, Universiti Sains Malaysia (USM), Engineering Campus, Penang, Malaysia.

Journal of Hazardous Materials

|December 15, 2010

Summary

This study introduces novel sequential resin treatments for landfill leachate, achieving high removal rates for color, chemical oxygen demand (COD), and ammonia nitrogen (NH3-N). The cationic/anionic sequence demonstrated superior efficiency in treating stabilized leachate.

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Area of Science:

Environmental Science
Water Treatment Technology
Chemical Engineering

Background:

Mature landfill leachate poses significant environmental challenges due to its complex composition.
Effective treatment of stabilized leachate is crucial for preventing water pollution.

Purpose of the Study:

To investigate two novel sequential resin treatment applications for mature landfill leachate.
To optimize treatment processes using Response Surface Methodology (RSM) and Central Composite Design (CCD).
To evaluate the impact of resin dosage on color, chemical oxygen demand (COD), and NH3-N removal.

Main Methods:

Application of sequential cationic/anionic and anionic/cationic resin treatments.
Optimization using Response Surface Methodology (RSM) with Central Composite Design (CCD).
Statistical modeling to assess individual and interactive effects of resin dosages.

Main Results:

Statistically significant models with high R(2) values (>0.8) were developed for removal efficiencies.
Optimal conditions yielded 96.8% color, 87.9% COD, and 93.8% NH3-N removal for the cationic/anionic sequence.
The anionic/cationic sequence achieved 91.6% color, 72.3% COD, and 92.5% NH3-N removal.

Conclusions:

Both sequential resin treatments are effective for mature landfill leachate.
The cationic/anionic sequence offers higher removal efficiencies for key pollutants.
RSM and CCD provide robust optimization and prediction of treatment performance.