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6CCVD Research

Electro-oxidation of landfill leachate using boron-doped diamond - role of current density, pH and ions

At a Glance

Section titled “At a Glance”
MetadataDetails
Publication Date2019-01-30
JournalWater Science & Technology
AuthorsFatmawati Agustina, Arseto Yekti Bagastyo, Ervin Nurhayati
InstitutionsSepuluh Nopember Institute of Technology
Citations25

Abstract

Section titled “Abstract”

Abstract Electro-oxidation using a boron-doped diamond (BDD) anode can be used as an alternative to leachate treatment. Aside from the hydroxyl radical, BDDs are capable of generating chloride and sulfate radical species that play significant roles in the oxidation of pollutants. This research investigated the role of Cl−:SO42− ions at molar ratios of 237:1, 4:1 and 18:1, and the influence of applied current density (i.e. 50, 75 and 100 mA cm−2) on the removal of organic and ammonium contaminants. The results show that current density had considerable effects on chemical oxygen demand (COD) and colour removal, while ion composition of Cl−:SO42− at pH 3, 5 and 8.5 (original pH) gave different effects on COD and ammonium removal. The pH had a significant effect on the COD removal at the ratio of 237:1, but showed no dramatic effect at the ratio of 18:1, giving ∼40% of COD removal at all pHs tested. This indicates that electro-oxidation at the ratio of 18:1 could be effectively conducted at a wide range of pH. Furthermore, the optimum ammonium removal was obtained at pH 8.5 with the ratio of 237:1. This process was found to be ineffective in increasing the biodegradability index of the leachate; instead, it exhibited mineralization of organic content.

Tech Support

Section titled “Tech Support”

Original Source

Section titled “Original Source”

References

Section titled “References”
  1. 2011 - Boron-doped diamond anodic treatment of landfill leachate: evaluation of operating variables and formation of oxidation by-products [Crossref]
  2. 2012 - Electrochemical oxidation of reverse osmosis concentrate on boron-doped diamond anodes at circumneutral and acidic pH [Crossref]
  3. 2007 - Ammonium removal from landfill leachate by anodic oxidation [Crossref]
  4. 2008 - Advanced treatment of landfill leachate from a sequencing batch reactor (SBR) by electrochemical oxidation process [Crossref]
  5. 1994 - Electrocatalysis in the electrochemical conversion/combustion of organic pollutants for waste water treatment [Crossref]
  6. 2014 - Understanding persulfate production at boron doped diamond film anodes [Crossref]
  7. 2008 - Reactions of chlorine with inorganic and organic compounds during water treatment - kinetics and mechanisms: a critical review [Crossref]
  8. 2015 - Removal of persistent organic contaminants by electrochemically activated sulfate [Crossref]
  9. 2017 - Assessment of the impact of chloride on the formation of chlorinated by-products in the presence and absence of electrochemically activated sulfate [Crossref]
  10. 2015 - Review on the electrochemical processes for the treatment of sanitary landfill leachates: present and future

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