Combined landfill leachate treatment methods: an overview

Efficient Hybrid Process of Fenton–Electrocatalytic Membrane Reactor–Biological Aerated Filter for the Treatment of Nanofiltration Retentate from Landfill Leachate without Concentrated Liquor Discharge

“…38 For example, the biological aerated filter (BAF) can remove the biodegradable organics, solid particles, ammonia, and nutrient (P and N) in a single unit. 4 However, a much lower ratio of BOD/COD (B/C) indicates poor biodegradability of the leachate concentrate, and therefore, it is inefficient to remove refractory organics in the leachate concentrate via a single biological process. When combined with the AOPs, the highly reactive species resulting from AOPs can rapidly oxidize a wide range of pollutants and degrade the refractory compounds, which are persistent to degrade using biological processes.…”

“…During the past decades, the integrated process of coupling AOP with biological treatment has been regarded as one attractive potential alternative in order to develop more powerful and sustainable processes to remove the refractory organics in wastewater and landfill leachate. − Actually, the biological treatment has been widely employed for wastewater treatment owing to the low cost and environment-friendly process, which is also an economical and efficient method to remove the biodegradable organic pollutants in the landfill leachate . For example, the biological aerated filter (BAF) can remove the biodegradable organics, solid particles, ammonia, and nutrient (P and N) in a single unit . However, a much lower ratio of BOD/COD (B/C) indicates poor biodegradability of the leachate concentrate, and therefore, it is inefficient to remove refractory organics in the leachate concentrate via a single biological process.…”

“…Landfill leachate as a special wastewater usually contains complex and highly toxic pollutants, including high concentrations of dissolved organic matter, ammonia nitrogen, and heavy metal ions, which pose serious threats to human health and environment. , Moreover, the organic composition in landfill leachate can become more complex and highly stable as the landfill ages. , Hence, landfill leachate must be collected and effectively treated in order to meet the discharge standard. ,− …”

Efficient treatment of landfill leachate membrane bioreactor effluent through sequential coagulation–flocculation and electrooxidation

“…In this way, it is possible to apply physicochemical processes together with biological treatment processes as pre-treatment, post-treatment, or a combination of both, to achieve organic matter removal and discharge criteria that are resistant to biological decomposition, increase treatment efficiency and reduce operating costs. 16,17 Coagulation-flocculation is one of the very simple methods that can be applied especially for stabilized leachate treatment. Coagulation-flocculation can be explained by two successive independent mechanisms.…”

Effect of the association of coagulation/flocculation, hydrodynamic cavitation, ozonation and activated carbon in landfill leachate treatment system

“…Among the examples that presented greater treatment efficiencies are coagulation/flocculation, chemical oxidation, adsorption by activated carbon, advanced oxidative processes and processes that involve membrane filtration 4 , 10 . However, the isolated application of these techniques has proved to be unsatisfactory for the efficient treatment of landfill leachate, requiring a synergistic combination of these processes 11 – 13 .…”