Landfill Leachate Treatment by Electrocoagulation and Fiber Filtration

Abstract

Landfilling is widely adopted as one of the most economical processes for solid waste disposal. At the same time, landfill leachate is also a great environmental concern owing to its complex composition and high concentrations of contaminants. This research investigated electrocoagulation and fiber filtration for the treatment of landfill leachate. Besides electrical current (i.e., current density) and reaction time, pH played a very important role in arsenic and phosphorus removal by electrocoagulation. The combination of electrocoagulation with fiber filtration achieved a 94% chemical oxygen demand (COD), 87% arsenic, 96% iron, and 86% phosphorus removal. During electrocoagulation, the micro-particles that could not be settled by gravity were removed by the first stage of fiber filtration. Organic contaminants in the leachate were further removed by biodegradation in the second stage of fiber biofiltration.

Optimization of saline wastewater treatment using electrochemical oxidation process: Prediction by RSM method

“…Several types of industrial wastewaters including pharmaceuticals, tannery and leather, textile, meat processing, fish, and marine products contain high concentrations of salts [6,7]. Salt can also be found at high concentrations in the leachate of urban landfill sites, contaminated groundwater, and the wastewaters resulting from mining operations and recycling units of gas and oil industries [[8], [9], [10]]. Fish processing industries need large amounts of sodium chloride for fish preservation.…”

Fenton-adsorption process for leachates from two landfills (karstic-clays)

“…In previous studies, different physicochemical treatments have been tested in leachate, including membrane filtration (Costa et al, 2019), coagulationflocculation, flotation, adsorption, Fenton oxidation (Méndez et al, 2009;Aftab and Hur, 2019;Smaoui et al, 2019, Zhang et al, 2019, Fenton/coagulation (Wu et al, 2010;Luo et al, 2019), heterogeneous Fenton and electrofenton (Sruthi et al, 2018), electrocoagulation with fiber filtration (Li et al, 2017), electrofenton with different doses of H 2 O 2 and Fe 2+ (Mohajeri et al, 2019) and using of sodium sulphate with H 2 O 2 in an advanced oxidation process (Hilles et al, 2016), among others. However, there is no treatment or treatment set have been found that achieve satisfactory removal in leachates and residue generated that being disposed under the applied normativity and are also economically feasible.…”

The evolution patterns of temperature, pH, and voltage during the removal of chemical oxygen demand from a landfill leachate using electrocoagulation under different conditions

“…Many investigations have successfully applied EC to remove COD from a landfill leachate [1,2,[16][17][18]. In these studies, affecting parameters and their individual, and sometimes collective roles, in the enhancement of EC have been investigated.…”