Removing refractory organic matter from nanofiltration concentrated landfill leachate by electrooxidation combined with electrocoagulation: Characteristics and implication for leachate management

Performance evaluation of hybrid electrochemical processes in mature leachate treatment

“…At higher current density values, oxidation times are shortened, and in lower current density applications, longer reaction times are required to achieve high removal efficiencies. A longer EO process at high current values significantly increases the side reactions and energy consumption 50‐52 . In this study, to determine the impact of applied current in the treatment of mature leachate with the EO process, the current was applied in the range of 0.25–1.5 A and COD removal efficiencies ranged from 30.6% to 49.7%.…”

“…In neutral and alkaline conditions, the COD removal efficiency decreases. The fundamental components in organic contaminant degradation by the indirect EO process are chlorine species, such as Cl 2 , ClO − , and HOCl 52 . Below pH 3.3, the main chlorine type is Cl 2 , which could be simply abstracted from the aqueous phase, while OCl − becomes the dominant species when the pH rises above 7.5.…”

“…The fundamental components in organic contaminant degradation by the indirect EO process are chlorine species, such as Cl 2 , ClO − , and HOCl. 52 Below pH 3.3, the main chlorine type is Cl 2 , which could be simply abstracted from the aqueous phase, while OCl − becomes the dominant species when the pH rises above 7.5. If the pH is above 9, the available chlorine turns into chlorate with low oxidation properties.…”

“…A longer EO process at high current values significantly increases the side reactions and energy consumption. [50][51][52] In this study, to determine the impact of applied current in the treatment of mature leachate with the EO process, the current was applied in the range of 0.25-1.5 A and COD removal efficiencies ranged from 30.6% to 49.7%. The greatest COD removal yield was reached with 49.7% at 1.5 A at the end of 180 min reaction time.…”

Effective Membrane Distillation of Landfill Leachate Concentrate Using a Superhydrophobic SiO2/PVDF Membrane for Resource Recovery

“…For instance, recirculation of the landfill leachate concentrate into the landfill may lead to accumulation of inorganic salts, remarkably impairing the performance of membrane technologies as the post treatment. − Evaporation and incineration with high energy consumption are deemed less sustainable . Other approaches like advanced oxidation and electrocoagulation are employed to eliminate organic compounds in landfill leachate concentrate, but the resulting effluents still fail to meet the discharge standards. , Adsorption is proven to be effective in eliminating organic matter from the landfill leachate concentrate. However, the limited adsorption capacity and high cost of adsorbents restrict their practical application .…”