Hog manure treatment system

C - Chemistry – Metallurgy – 05 – B

Patent

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Details

C05B 9/00 (2006.01) C02F 1/52 (2006.01) C05D 9/00 (2006.01) C05F 3/00 (2006.01) C02F 1/20 (2006.01) C02F 1/56 (2006.01) C02F 1/66 (2006.01) C02F 9/00 (2006.01) C02F 11/14 (2006.01)

Patent

CA 2493615

The invention relates to a method of treating manure such that odour from the manure is significantly reduced or eliminated and producing therefrom recyclable water, value-added biosolids and ammonia. Specifically, the manure is combined with lime at high pH. The material is mixed under negative pressure and the basic conditions cause ammonia to be evolved from the manure which is then drawn off and recovered. A coagulating agent is then added which further promotes floc formation within the manure. Following further mixing, flocs are separated from the liquid portion. A struvite-promoting chemical and a coagulant are then added to the liquid portion which causes further floc formation, and the flocs are again separated from the substantially clear liquid. It is of note that as a result of this process, the solids are highly hydrophobic and dry very quickly. It is of further note that solids isolated from either step can be combined and sold, for example, as fertilizer, as discussed below. The clear liquid can be used, for example, in barn washes or for horticultural watering.

L'invention concerne un procédé de traitement de lisier de porc permettant de réduire ou d'éliminer sensiblement l'odeur du lisier et de produire à partir de ce dernier de l'eau recyclable, des biosolides à valeur ajoutée et de l'ammoniac. Ce procédé consiste plus spécifiquement à combiner ce lisier avec de la chaux de manière à obtenir un pH élevé. On mélange les matières en les soumettant à une pression négative et ces conditions de base provoquent le dégagement de l'ammoniac, lequel est ensuite extrait et récupéré. On ajoute alors au lisier un agent de coagulation qui favorise la floculation. Après un nouveau brassage, on sépare le floculat de la fraction liquide. On ajoute ensuite un agent chimique promoteur de struvite et un coagulant à la fraction liquide afin de provoquer une nouvelle floculation, et on sépare à nouveau le floculat du liquide sensiblement clair. Les solides obtenus par ce procédé sont hautement hydrophobes et sèchent très rapidement. En outre, les solides peuvent être isolées à l'une ou l'autre étape et peuvent être combinés et vendus en tant qu'engrais par exemple. Le liquide clair peut être utilisé par exemple pour le nettoyage des étables ou pour l'arrosage de plantes horticoles.

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