Nitrogen removal from swine wastewater by combining treated effluent with raw manure
DOI:
https://doi.org/10.1590/S0103-90162012000600002Palavras-chave:
nutrient removal, swine effluent, treatment, water reuseResumo
Effluents from swine raising can be harmful to the environment if not correctly managed. Nitrogen (N) is usually the main element present at high concentrations in the effluent. Since the use as biofertilizer is not always a feasible alternative, the treatment of swine wastewater is necessary. Variations in N species and water solubility make the treatment difficult and expensive. Additional N removal at low cost via denitrification may be possible by recirculating nitrified effluent in the barns. In this study, raw manure (RM) was homogenized with treated effluent (TE) at RM/(RM + TE) ratios of 1.0, 0.9, 0.8, 0.7, 0.6, 0.5 and 0 in order to simulate the effect of reused water on swine wastewater nitrogen removal. Samples were collected daily during four days and analyzed for pH, oxidation-reduction potential, NH4-N, NO2-N, NO3-N and chemical oxidation demand. The oxidized nitrogen (NOx-N) half-life degradation was estimated using linear regression. NOx-N species half-life less than one day was obtained when treated effluent was combined and thoroughly homogenized with raw manure. It is suggested that combining raw manure with treated effluent (e.g. water reuse) can be a simple and cost-effective strategy to remove nitrogen from swine wastewaters.Downloads
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Publicado
2012-12-01
Edição
Seção
Engenharia Agrícola
Licença
Todo o conteúdo do periódico, exceto onde está identificado, está licenciado sob uma Licença Creative Commons do tipo atribuição BY-NC.Como Citar
Nitrogen removal from swine wastewater by combining treated effluent with raw manure. (2012). Scientia Agricola, 69(6), 352-356. https://doi.org/10.1590/S0103-90162012000600002