Combined ozone-activated sludge treatment of landfill leachate

Abstract

Biological treatment is widely preferred by many landfill owners to remove the bulk of the pollutants in leachate. Specific problems due to toxicity and nutrient deficiencies are however frequently reported. This study investigates the possibility of pre-treating leachate to decrease its toxicity and increase its biodegradability, using ozonation. Lab-scale and pilot testing has shown that nitrification toxicity was minimised by ozone pre-treatment. A decrease of the COD/BOD-ratio from 16 to 6 was achieved, making the pre-treated leachate co-treatable in municipal sewage treatment. The operational cost for the pre-treatment was estimated at 1.34 Euro/kg COD.

Landfill leachate treatment with ozone and ozone/hydrogen peroxide systems

“…These values show that the lowest cost was 3.1 TND (∼2.3 USD)/kg COD removed obtained for the O 3 /H 2 O 2 system at 2 g/L H 2 O 2 . Schulte et al [11] have also showed that O 3 /H 2 O 2 system was the least expensive process [44] but are about three times lower than (∼7.5 USD/kg COD) presented in [11]. It is to note that these cost figures should be treated with caution as accurate cost estimate is difficult to make since costs may change daily following for example fluctuations in energy prices.…”

An overview of landfill leachate treatment via activated carbon adsorption process

“…Explicitly, a wide range of integrative approaches which encompassing physical, chemical and biological technologies (membrane filtration-biological [87], ozonation-biological [88], chemical precipitation-biological oxidation [89], activated carbon-biological, and anaerobic-aerobic-rotating biological contactor systems [90]) are attracting extensive momentum and high priorities. Varying upon the alterations of time, place and context, environmental effectiveness, technological feasibility, social acceptability and economical affordability (chemicals, energy consumption, treatment facilities, labor, transportation, collection and maintenance) are usually the key drivers deciding its flexibility, reliability and sustainable manner.…”

Review on Landfill Leachate Treatments

“…The adsorption process is used as a stage of integrated chemical-physical-biological process for landfill leachate treatment [17] , or simultaneously with a biological process [28] . The most frequently used adsorbent is granular or Powdered Activated Carbon (PAC).…”