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Sustainable treatment of municipal landfill leachate by combined association of air stripping, Fenton oxidation, and enhanced coagulation

  • Sushmita DeEmail author
  • Tumpa Hazra
  • Amit Dutta
Article
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Abstract

The present world has been facing the problem of municipal solid waste disposal with the generation of highly complex and toxic landfill leachate. Thus, in this research work, treatability of landfill leachate had been investigated by the combined approach of air stripping, Fenton oxidation, and enhanced coagulation to comply with discharge standard. At the initial stage of treatment, air stripping of raw leachate was implemented which removes around 51.50% of COD, 74.60% of BOD5, and 97.60% of NH3-N within 36 h of optimum retention time. Following air stripping, Fenton oxidation was applied with an optimum molar ratio of 1.9 of H2O2/Fe+2 which register a maximal removal of 67.70% of COD, 92.30% of BOD5, and 14.90% of Hg. Finally, enhanced coagulation (EC) with in situ formed Mn-Fe hydr(oxides) was employed and optimized by central composite design (CCD) of response surface methodology (RSM). Response surface plots denote an optimum condition of 0.13 M ratio of Mn/Fe, 22.67 mM of coagulant dose, and 7.78 of pH which corresponds to a maximum removal of 55.98% of COD and 77.68% of Hg. FTIR analysis of the precipitates of EC explained that the hydroxyl groups are primarily involved in the process of Hg removal. Moreover, EDAX spectrum also assured the removal of Hg by its existence with Mn-Fe complexes. Thus, the present line of treatment record an overall removal of 90.80% of COD, 98.0% of BOD5, 97.60% of NH3-N, and 82.68% of Hg which proves to be effective for the removal of leachate pollutants.

Keywords

Landfill leachate Air stripping Fenton oxidation Enhanced coagulation In situ Mn-Fe hydr(oxides) Response surface methodology 

Notes

Acknowledgements

Authors would like to express gratitude for the support of Kolkata Municipal Corporation (KMC) during the continuous field work for collecting the leachate samples. Moreover, first author gratefully acknowledge the grant of research fellowship by University Grants Commission (UGC), New Delhi, India.

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringJadavpur UniversityKolkataIndia

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