TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Method: The inhibition comprises reversible inhibiting urease activity, and/or irreversibly inhibiting urease activity. It may include reversible inhibiting urease activity of the collected waste matter before the separation of the urease-activity inhibited waste matter into a urea-rich fraction and urea-lean fraction. The collected waste material is treated by a method comprising decreasing and/or increasing the pH, buffering pH, decreasing and/or increasing temperature, decreasing and/or increasing pressure, and/or decreasing and/or increasing ionic strength. The irreversible inhibitor is recovered from the irreversibly urease-activity inhibited and separated urea-rich fraction. The provided product comprises animal waste-matter indicators, preferably cations (of sodium, potassium, calcium), phosphate ion, bilirubin, albumin, uric acid in range of 200 mmol to 5 mum.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Components: The inhibitor is urea compounds, hydroxamates, benzoates, sulfonates, imides, phosphor compounds, monovalent ions, divalent metal ions, trivalent ions, or other compounds. The urea-rich fraction exhibits no urease activity, preferably less than 5 unit/ml. It exhibits minor residues of irreversibly urease-activity inhibitor. The urea compounds can be hydroxyurea, seleno-urea, phenylurea, or thiourea. The hydroxamates can be amino acid hydroxamates, or acetohydroxamate. The benzoates can be p-substituted mercuribenzoate, p-chloromercuribenzoate, p-hydroxymercuribenzoate, or iodosobenzoate. The sulfumate can be p-chloromercuribenzene-sulfonate. The imides can be N-ethylmaleimide. The phosphor compounds can be phosphoramidate, or phosphate. The monovalent ions can be fluoride, sodium cation, or potassium cation. The divalent metal ions are Hg2+, Cu2+, Fe2+, Co2+, Zn2+, Ni2+, Mn2+, Cd2+, Ag+, Mg2+ (weak), Ba2+, and/or preferably Cu2+, Ag+, or Pb2+ in the form of water-soluble salt, and/or electrochemically-released ion. The trivalent ions can be As3+. The other compounds can be beta-mercaptoethanol, iodine, suramin, phenylsulfinate, or furacin.    TECHNOLOGY FOCUS - MECHANICAL ENGINEERING - Preferred Components: The separator comprises sedimentation container, preferably centrifuge. The collector comprises a flushing device. The urease-inhibitor storage tank comprises recirculating element of recovered inhibitor. The system further comprises urea-rich fraction storage container