Simultaneous ammonia and organics degradation from municipal landfill leachate by electrochemical oxidation.
Pubali MandalAshok K GuptaBrajesh Kumar DubeyPublished in: Environmental technology (2024)
The two primary issues for wide implementation of the electrochemical oxidation of wastewater are the significant cost of electrode and high energy consumption. On the other side, conventional biological processes and membrane technology have several drawbacks for recalcitrant landfill leachate (LL) treatment. To address these issues, graphite/PbO 2 anode was used to treat medium to mature age (biodegradability index, 5-day biochemical oxygen demand/chemical oxygen demand: 0.25) LL. To reduce the cost of the oxidation process and maximize the efficiency, operating conditions were optimized. The optimum parameter values were obtained as 24.7 mA cm -2 , 180 ± 3 rpm, and 1.9 cm of current density, stirring rate, and electrode gap, respectively. Dissolved organic carbon (DOC), chemical oxygen demand (COD), and ammonia-N removal efficiencies of 55 ± 1.4%, 81 ± 1.9%, and 56 ± 3% were obtained after 8 h of degradation at optimum conditions. The decrease in aromatic substances and ultraviolet (UV) quenching materials were evaluated by UV-Visible spectroscopy and Specific UV absorbance. The conversion of aromatic compounds into simpler molecule compounds was also verified by Fourier-transform infrared spectroscopy analysis. The lab-scale anode synthesis cost was evaluated as 0.42 USD.
Keyphrases
- municipal solid waste
- anaerobic digestion
- sewage sludge
- hydrogen peroxide
- gold nanoparticles
- electron transfer
- wastewater treatment
- reduced graphene oxide
- ion batteries
- ionic liquid
- amino acid
- primary care
- molecularly imprinted
- solid state
- room temperature
- label free
- carbon nanotubes
- aqueous solution
- single molecule
- visible light
- mass spectrometry
- heavy metals
- simultaneous determination
- data analysis