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Abstract

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.sub.2) and ii) an insoluble basic salt of the same alkaline earth metal (e.g. CaCO.sub.3) 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.

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First Claim