Date Full Report Received


Date Abstract Report Received



Primary Investigator:
Co-Investigators: Joshua Brown, Joseph Zulovich, Christine Costello

The objectives of this research were to evaluate performance of a solid-liquid separation finishing barn in improving manure nutrient management, potential nutrient/water recycling based on filtration, and barn construction and operating costs. A full-scale barn in Missouri was closely monitored for the solid and liquid manure productions and nutrient contents. Laboratory scale pretreatments and filtrations were conducted to evaluate the practicality of nutrient/water recycling from the separated liquid manure. The daily liquid manure production averaged 885 gallons, and daily solid manure production averaged 299 gallons. The solid separation system removed 61.7%, 41.7%, 74.8%, and 46.2% of nitrogen, ammonium, phosphorous, and potassium, respectively, from the total manure production. The filtration results indicate that the microfiltration was capable of removing most if not all of the solids but not the dissolved nutrients. The reverse osmosis process was time and energy intensive, with only minimal nutrient removal, but was probably constrained by the relatively small-scale (inefficient compared with larger units), small filter surface area, and high dissolved nutrients in the liquid manure. The construction cost of the solid-liquid separation barn was comparable (17% higher than) to the deep-pit barn. Additional electricity cost was $331 per year for daily operation of the scraper and conveyor systems, and pumping the liquid manure. The additional maintenance of the scraper system averaged $1,342 per year. The solid-liquid separation barn was shown to have better air quality when compared with deep-pit barns.