This presentation was held by Jorge Oliva (Waste in Water & Energy Consulting, Spain) at the thematic event focused on ‘Environmental aspects of landfill management projects’ under the session ‘Impacts: leachates, soil protection, ground water, floods & landfills close to coast’. The event took place in Cordoba (Spain) on February 22, 2018.

Jorge Oliva presented a technique of leachate treatment, of wide use in landfills of the Mediterranean South consisting of forced evaporation of leachate. The elimination technique consists of dehydration of the liquid by evaporation of the water in atmospheric regime forced to reduce it to several times smaller than the original volume.

Dehydration is performed on modules, in which the liquid that has to be concentrated comes in contact with non-saturated air through your sprinkler on special design contact diapers. Atmospheric air absorbs water from the liquid is sucked through a high performance motor group and download saturated into the atmosphere.

Atmospheric evaporation technique is applicable when there is a suitable combination of moisture and temperature, being able to reach high concentrations in the sewage sludge, leading in some cases to a reduction in volume between 95 and 98%, According to the initial concentration.

In conclusion, tells us that:

• The leachate of landfill is a very variable residue in its flow and its composition.

• Treatment technologies are very broad and varied and must adapt to the specific needs of each area.

• The selection of the appropriate technology is a matter of the flow to be treated, their degree of contamination and the limits on the dumping in each country.

• The cost of the treatment of leachate is an important element in the selection of the solution, both in the phase of exploitation and the after care of the landfill.

You can find the entire presentation (in Spanish) here.