1
Frederick T Varani: Method and apparatus for the anaerobic digestion of decomposable organic materials. Bio Gas of Colorado, Edwin L Spangler Jr, January 20, 1976: US03933628 (48 worldwide citation)

This invention relates to an improved anaerobic digestion apparatus for decomposable organic materials characterized by a digestor covered and sealed by a liquid-filled pond heated with solar energy. The effluent from the fermentation reaction taking place in the digestor has excellent absorptivity ...


2
Frederick T Varani: Method and apparatus for processing animal waste. Bio Gas of Colorado, Edwin L Spangler Jr, June 17, 1980: US04208279 (24 worldwide citation)

This invention relates to an improved apparatus for both processing and removing animal waste products from a pit continually supplied therewith which comprises a ramp-like lid partially covering the pit and cooperating with the contents thereof to seal the latter from the atmosphere except where th ...


3
Varani Frederick T: Methode et appareil pour traiter les detritus animaux, Method and apparatus for processing animal waste. Bio Gas Of Colorado, JOHNSON ERNEST PETER, August 17, 1982: CA1129733

ABSTRACT OF THE DISCLOSURE This invention relates to an improved apparatus for bothprocessing and removing animal waste products from a pit continuallysupplied therewith which comprises a ramp-like lid partially covering thepit and cooperating with the contents thereof to seal the latter from theatm ...



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