1. Soil purification
1.1 Pollutant removal by soil
Infiltration of wastewater through an unsaturated porous medium reduces :
suspended solids (SS) by filtration ;
soluble organic matter (carbon and nitrogen) by biological oxidation, adsorption, ion exchange and precipitation;
pathogenic micro-organisms through complex processes of fixation, filtration, inactivation and predation .
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Soil purification
Purification systems decree of September 7, 2009
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