Patent ID: 7731856
Filing Date: 2010-06-08
Classification: A01K,C05C,C05F,C05G,C07C,Y02A,Y02E,Y02P,Y02W,Y10S

Abstract:
1. A method of treating waste matter from animals, the method comprising: a) collecting waste matter from the animals; b) inhibiting urease activity in said collected waste matter; and c) separating said urease-activity inhibited waste matter into a urea-rich fraction essentially consisting of a liquid comprising urea and other components soluble in liquid manure and a urea-lean fraction; d) irreversibly inhibiting urease activity in said urea-rich fraction wherein said irreversible inhibition comprises treating said urea-rich fraction with an irreversible inhibitor, said inhibitor being selected among the group consisting of urea compounds selected from the group consisting of hydroxyurea, selenourea, phenylurea and thiourea; benzoeates selected from the group consisting of p-substituted mercuribenzoate, p-chloromercuribenzoate, p-hydroxymercuribenzoate and iodosobenzoate; p-chloromercuribenzenesulfonate; N-ethylmaleimide; phosphor compounds selected from the group consisting of phosphoramidate and phosphate; monovalent ions selected from the group consisting of F divalent metal ions selected from the group consisting of Hg and combinations thereof in form of at least one water-soluble salt, and/or at least one electrochemically-released ion; As at least one nickel-complexing agent selected from the group consisting of dimethylglyoxime, ethylenediamine and combinations thereof, and compounds selected from the group consisting of beta-mercaptoethanol, iodine, suramin, phenylsulfinate, and furacin; e) recovering the urea-rich essentially liquid fraction obtained in step c); and f) recovering the urea-lean fraction obtained in step c; wherein said inhibition of step b) comprises treating said collected waste matter by a method including at least one step selected from the group consisting of decreasing pH, buffering pH, at least one of decreasing and increasing pressure, at least one of decreasing and increasing ionic strength and combinations thereof.