Abstract: A method of producing an organic based fertilizer and usable water from animal waste includes the step of separating the animal waste into liquid waste and solid waste. The liquid waste is clarified to produce a supernatant and a sludge which is pressed into a filter cake. Ammonia is extracted from the supernatant to produce ammonium sulfate and an aqueous solution. The aqueous solution is filtered to produce a concentrate and water filtrate. The water filtrate may be used as drinking and washing water. The filter cake, ammonium sulfate, and concentrate may be used to supplement to the solid waste which is pelletized into the organic based fertilizer. In alternative embodiments a portion of the supernatant and aqueous solution may be used as a liquid fertilizer.

Abstract: A method of producing an organic based fertilizer and usable water from animal waste includes the step of separating the animal waste into liquid waste and solid waste. The liquid waste is clarified to produce a supernatant and a sludge which is pressed into a filter cake. Ammonia is extracted from the supernatant to produce ammonium sulfate and an aqueous solution. The aqueous solution is filtered to produce a concentrate and water filtrate. The water filtrate may be used as drinking and washing water. The filter cake, ammonium sulfate, and concentrate may be used to supplement to the solid waste which is pelletized into the organic based fertilizer. In alternative embodiments a portion of the supernatant and aqueous solution may be used as a liquid fertilizer.

Abstract: A method of producing methane, an organic based fertilizer and usable water from animal waste includes the step of separating the animal waste into liquid waste and solid waste. The solid waste is subjected to anaerobic digestion to produce methane and a wet by-product. The wet by-product is pressed to into a filter cake which is pelletized into the organic based fertilizer. The liquid waste is clarified to produce a supernatant and a sludge which is pressed into a filter cake together with the wet by-product. Ammonia is extracted from the supernatant to produce ammonium sulfate and an aqueous solution. The aqueous solution is filtered to produce a concentrate and water filtrate. The water filtrate may be used as drinking or washing water. The ammonium sulfate and concentrate may be used to supplement to the solid waste which is pelletized into the organic based fertilizer. In alternative embodiments a portion of the supernatant and aqueous solution may be used as a liquid fertilizer.

Abstract: According to one aspect of the invention, there is provided a waste collection system for separating liquid waste from solid waste which includes a conveyor having an upper conveyor roller, a lower conveyor roller and an endless conveyor belt extending around the conveyor rollers. The upper run of the conveyor belt is upwardly concave. In cross section, the upper run has a lowermost portion and lateral portions diverging laterally and upwardly from the lowermost portion. The upper run is longitudinally inclined from the upper roller to the lower roller. A waste deflector extends above and along the lowermost portion of the upper run. Separate liquid and solid waste collectors are located in the vicinity of the upper and lower rollers. A conveyor drive is connected to on of the conveyor rollers.

Abstract: A method of treating an animal waste slurry so as to efficiently extract nutrients, and which can be performed in a zero-discharge system, comprises flocculating the slurry, processing, e.g. filtering, the flocculated slurry to separate liquid from solid material, drying the solid material, processing the liquid to extract ammonium, phosphorous and potassium from the slurry, all within 24 hours, and preferably on average within 12 hours, of production of the waste material by animals. Since the urates of potassium and ammonium in the slurry take a few hours to break down, they remain in crystalline form and therefore a larger portion of the total amount of potassium and ammonium in the slurry can be extracted.