Patents Assigned to HydroGeo North America L.L.C.
  • Method and related product for purification of waste water
    Patent number: 5415778
    Abstract: A method and related product for purification of waste water, especially of water polluted with phosphorus, nitrogen, heavy metals, and chlorinated solvents. The purification process consists of:a) adding two liquid mixtures in sequence to the waste water;b) letting the pollutants react with the two mixtures;c) subsequently removing the sludge that forms.One of the two liquid mixtures in question is a liquid mixture of two acids that may be extracted from lignite, leonardite and fossils of vegetal origin like peat.
    Type: Grant
    Filed: February 28, 1994
    Date of Patent: May 16, 1995
    Assignee: HydroGeo North America L.L.C.
    Inventors: Roberto Zanin, Gaetano Boetti