New leachate plant in Europe treats 350,00 cubic metres per year of wastewater

A new leachate treatment plant near the Artigas municipal water station in the European country of Basque has a capacity for treating 350,000 cubic metres a year, equivalent to the amount of wastewater generated by a city of 50,000 inhabitants in one year.

Mar 5th, 2004

March 5, 2004 -- A new leachate treatment plant near the Artigas municipal water station in the European country of Basque has a capacity for treating 350,000 cubic metres a year, equivalent to the amount of wastewater generated by a city of 50,000 inhabitants in one year.

Leachates are the dirty or contaminated waters from landfills, produced as a consequence of both the moisture already present in the waste as well as of rainwater contaminated on passing through the waste material.

The leachate treatment plant is located at the installations of the Artigas municipal water station, in Bilbao Basque Country, occupying a surface area of 3,575 square metres, Basque Research reported. The building is made up of two basic zones: the reservoirs and the treatment plant.

The first is made up of three 400-cubic metre reservoirs the function of which is regulate and homogenise the leachate flow entering the plant. In second place, the treatment plant holds the equipment that purifies the liquid. In this second zone an area of 280 square metres is given over to an Environmental Interpretative Centre.


The treatment of leachates

The main contamination in leachates is the high level of organic material principal which eats up any oxygen on being dumped, although does not contain highly toxic elements such as, for example, heavy metals.

Given that the characteristics of the leachate to be treated are those of waste with organic contamination and with a high degree of biodegradability, the most ideal process considered was one based on biological treatment.

The treatment process is based on the biological disintegration of contaminant substances by means of a biological process with subsequent retention, through ultra-filtration, of generated particles.

In this way, the Artigas leachate plant will reduce the contaminants in the waste by almost 1,400 kilograms per day and bring forward the date for compliance with the new European norm.

Treatment process

The treatment process consists of two equal lines which work independently and as functions of flow and treatment. Each line is made up of a particle filter and two tanks where the wastewater is treated biologically.
Finally, an ultra-filtration retains the non-dissolved particles greater than 0.02 micros diameter. The whole biological process works at a temperature of 37 ºC and a pressure of 3 bars. The leachate treatment plant has a capacity to treat 350,000 cubic metres a year, equivalent to the amount of wastewater generated by a city of 50,000 inhabitants in one year.

More information: http://www.basqueresearch.com/


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