Her Majesty the Queen in Right of Canada, As Represented by the Minister of Agriculture and Agri-food

Agriculture and Agri-food Canada

Bio-terre Systems Inc.

Daniel I Massé

Steve Boivin

Simon Guertin

François Lamarche

A biological process for removing hydrogen sulphide from biogas is disclosed. The process involves injecting a small quantity of air into the gas phase or the liquid phase of a psychrophilic bioreactor to allow microbial flora to convert the hydrogen sulphide into elemental sulphur.

Biological oxidation of hydrogen sulphide in a psychrophilic anaerobic digestion bioreactor subjected to microaerobic conditions

Described is a process for treating an animal husbandry effluent slurry, such as hog manure, containing suspended solid particles. The process includes a) providing a liquid portion of the effluent, b) diluting the liquid to a Newtonian fluid, c) assuring the pH is under 10, d) adding to the fluid i) a soluble salt of alkaline earth metal (e.g. CaCl) and ii) an insoluble basic salt of the same alkaline earth metal (e.g. CaCO) to balance available cations and promote agglomeration of the suspended solid particles, e) adding a cationic coagulant to obtain a pre-treated destabilized colloid mixture with zero zeta potential value, and f) performing electroflotation to obtain a treated liquid and floated solids.

Growing community of inventors

Sherbrooke, Canada

Daniel I Massé