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Advanced landfill leachate treatment using iron-carbon microelectrolysis- Fenton process: Process optimization and
Liqun Wang1, Qi Yang1, Dongbo Wang1
1College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
Journal of Hazardous Materials
|July 25, 2016
Summary
A novel hydrogen peroxide-enhanced iron-carbon microelectrolysis reactor effectively treats landfill leachate. This combined process significantly removes chemical oxygen demand and degrades refractory substances, offering a promising solution for wastewater management.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Chemical Engineering
Background:
- Mature landfill leachate poses significant environmental challenges due to its high organic load and refractory compounds.
- Conventional treatment methods often struggle with the complex composition of aged leachate.
- There is a need for efficient and robust pretreatment technologies for landfill leachate.
Purpose of the Study:
- To develop and optimize a novel hydrogen peroxide-enhanced iron-carbon (Fe-C) microelectrolysis reactor for mature landfill leachate pretreatment.
- To investigate the treatment efficiency in terms of chemical oxygen demand (COD) removal and biochemical oxygen demand to chemical oxygen demand (BOD5/COD) ratio.
- To evaluate the degradation of high molecular weight organic substances and assess the practical applicability of the reactor.
Main Methods:
- A hydrogen peroxide-enhanced Fe-C microelectrolysis reactor was designed and operated.
- Response Surface Methodology (RSM) was employed to optimize operating variables: Fe-C dosage, H2O2 concentration, and initial pH.
- Three-dimensional excitation and emission matrix (3D-EEM) fluorescence spectroscopy and molecular weight (MW) distribution analysis were used to characterize leachate components.
- Fixed-bed column experiments were conducted to assess practical applicability.
Main Results:
- The optimized reactor achieved a high COD removal efficiency of 74.59% and a BOD5/COD ratio of 0.50.
- Optimal operating conditions were determined as Fe-C dosage 55.72g/L, H2O2 concentration 12.32mL/L, and initial pH 3.12.
- Significant degradation of high molecular weight fractions, including refractory fulvic-like substances, was observed due to the combined microelectrolysis and Fenton process.
- Breakthrough curves from fixed-bed column experiments indicated practical applicability.
Conclusions:
- The hydrogen peroxide-enhanced Fe-C microelectrolysis reactor is a highly efficient technology for mature landfill leachate pretreatment.
- The combined microelectrolysis and Fenton process effectively breaks down refractory organic matter.
- This technology presents a promising and viable solution for advanced landfill leachate treatment.
