Submitted to: Porci Monograph National Institute Of Agricultural Research (Spain)
Publication Type: Monograph
Publication Acceptance Date: September 15, 2001
Publication Date: N/A
Technical Abstract: This monograph, written in Spanish, describes some of the environmental problems associated with improperly managed manure in modern confined livestock production as well as emerging alternative treatment technologies to solve the problems. The continued global trend towards fewer but larger production operations in confinement means that more manure nutrients are being generated and concentrated within relatively small geographic areas. Using environmentally-safe alternatives to land application of manure are needed in areas where nutrient supply exceeds available land and/or where land application would cause significant environmental risk. One approach is to separate solids and organic nutrients from the liquid manure and transport and treat the solids with a variety of technologies to generate value-added products. These products include stabilized peat substitutes, humus, organic fertilizers, soil amendments, energy, and proteins. Our research has shown that a high recovery of solids and organic nutrients (>90%) is possible with polymer treatment. The remaining liquid needs to be treated in the farm. A variety of biological or chemical processes can be used to achieve specific nutrient management goals. Biological ammonia removal is effective to remove ammonia; this treatment can be greatly enhanced with the use of immobilized technology. After nitrification treatment, soluble phosphorus can be effectively extracted with lime precipitation in the form of calcium phosphate products. In addition to the nutrient removal aspect, nitrification and phosphorus treatments are very effective to reduce pathogens in the liquid effluents.