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Swine Production System Nitrified Wastewater Reuse as a Strategy to Remove Nitrogen

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008475.(doi:10.13031/2013.29623)
Authors:   Airton Kunz, Ricardo Steinmetz, Arlei Coldebela
Keywords:   Denitrification, animal manure, reuse

The way of swine production has changed considerably in the last 30 years been converted from extensive to a very intensive systems. This aspect brought an environmental passive in regions with high animal density and low soil absorption capacity. When effluent nitrogen removal is necessary, one thing that can be considered is the possibility of a nitrified effluent reuse in the houses promoting the denitrification using the raw manure as a carbon source for the process. In this study, samples of raw manure (RM), produced during 24 hours, were collected directly from the reception pits inside finishing houses and treated nitrified effluent (TE) from a swine manure treatment system at Embrapa Swine and Poultry experimental facilities (Brazil). RM/TE+RM were mixed at different ratios (1, 0.9, 0.8, 0.7, 0.6, 0.5 and 0) to simulate reuse conditions, and stored in triplicate for 5 days. Homogeneous samples were collected and submitted to determination of pH, ORP, NH3-N, NO2-N, NO3-N and COD according to standard methodologies. NOx-N shown a very fast deplection when a fresh manure was diluted with a nitrified treated swine effluent, reducting (NOx-N) in more than 98 % after storage for four days in all dilution ratios. Probably, the high heterotrophic conditions of the raw manure gives a special condition to the very fast nitrogen removal under anoxic conditions.

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