Denitrification in‐situ of groundwaters with solid carbon matter

Abstract

We propose a denitrification process of in‐situ treatment. The system has a central drilling from which water is partly pumped out and distributed, the other part is sent in reactors filled up with a mixture of straw and maërl and then reinjected in aquiferous through the soil. Five series of experimentation in‐situ have been made. A fall down of the nitrates in aquiferous from 10 to 20 mg.l⁻¹ has been shown very quickly. The water which goes out from reactors contains organic matter, nitrite and micro‐organisms but is completely purified by going through the soil. So, the drilling water presents a chemical and biological quality compatible with drinkability norms.