2007 Annual Report 1a.Objectives (from AD-416) Treat swine wastewater and derive energy products in a treatment wetting/mechanical treatment system. 1b.Approach (from AD-416) Solids from a swine barn flush wastewater will be treated to promote struvite formation and flocculation followed by solids separation. The remaining liquid will be low in phosphorus and moderate in ammonia concentrations; it will be treated in constructed wetlands microcosms to remove nitrogen alkalinity and pathogens. A final high pH treatment with calcium hydroxide will kill remaining pathogens and precipitate phosphorus. The phosphorus precipitate will be pumped to the beginning solids separation unit where it will be removed with the solids. 3.Progress Report This report serves to document research conducted under a specific cooperative agreement between ARS and North Carolina A&T State University. Additional details of research can be found in the report for the in-house associated project 6657-13630-003-00D, Innovative Animal Manure Treatment Technologies for Enhanced Environmental Quality. Wastewaters from swine farms contain high concentration of ammonia nitrogen. When applied to limited land, this wastewater may cause degradation of both air and water quality. Furthermore, the high ammonia concentration may cause plant damage when constructed wetlands are used to treat the wastewater. This study focused on the removal of ammonia-nitrogen from wastewater using shale and zeolite. Shale was able to absorb 50% of the ammonia at concentrations of about 300 mg/liter of nitrogen. Moreover, the zeolites were able to adsorb 90% of the ammonia in solution as high as 1,000 mg/liter of nitrogen. This technique may provide a method of reducing ammonia levels in livestock wastewater below toxic levels prior to passive, natural treatment in constructed wetlands. This agreement was monitored by phone calls, emails, meetings, and site visits.