Patents Assigned to DH20 L.L.C.
  • Patent number: 6709594
    Abstract: A method of treating of municipal sludge, paper-pulp sludge, animal and plant waste, and the like, whereby the treatment thereof via electroporation causes the breakdown of waste activated sludge, which is then recycled back to a bioreactor, or to one or more additional bioreactors such as aerobic, facultative, anoxic, or strictly anaerobic.
    Type: Grant
    Filed: October 15, 2002
    Date of Patent: March 23, 2004
    Assignee: DH20, L.L.C.
    Inventors: Jeffrey Held, Satya P. Chauhan
  • Patent number: 6540919
    Abstract: A system that allows the flexibility of primary and secondary treatment of municipal sludge, paper-pulp sludge, animal and plant waste, whereby the treatment thereof via electroporation may be used either as the primary dewatering treatment, secondary dewatering treatment, direct WAS-treatment, and combinations with other conventional dewatering techniques, in order to provide the municipal treatment plant, or the paper-pulp treatment plant, with the most cost-effective and efficient system as possible. The electroporated-treated sludge releases hitherto unreleased biosolids exiting from the PEF-electroporation system, which are returned to aeration tanks. The electroporation process causes the release of intracellular dissolved/organic matter, which is used as “food” for the bacteria of the aeration tanks.
    Type: Grant
    Filed: March 26, 2002
    Date of Patent: April 1, 2003
    Assignee: DH20 L.L.C.
    Inventors: Jeffry Held, Satya P. Chauhan
  • Patent number: 6491820
    Abstract: The present invention is directed to a pulsed electric-field system for rupturing and destroying molecular cellular units of waste-activated sludge to thereby liberate intracellular water molecules from the solids-content thereof. The waste-activated sludge is contained in waste sludge, such as paper-pulp sludge, municipal waste sludge, animal or plant waste sludge. The pulsed-electric field is generated by an electroporating device producing a non-arcing pulsed electric field. The released intracellular dissolved/organic matter may be recycled back to an aeration tank for supplying food to bacteria of the aeration tank for performing aerobic digestion thereon, whereby the intracellular, dissolved organic matter is used as food for the bacteria of the aeration tank, whereby the aerobic digestion process is accelerated.
    Type: Grant
    Filed: December 3, 2001
    Date of Patent: December 10, 2002
    Assignee: DH20 L.L.C.
    Inventors: Jeffry Held, Satya P. Chauhan