Sistema integrado para tratamento de resíduos gerados pela suinocultura

Abstract

This study evaluated the performance of an integrated system to provide treatment to swine raising dejects, aiming to make use of its byproducts generated in the treatment. The system have been operating in batches in periods of 28 and 63 days and was compounded for an low-charge anaerobic reactor and six beds cultivated with macrophytes. The reactor was constructed with concrete in a cylindrical shape, the beds cultivated with Typha-sp with sub-superficial vertical flow were built in 200L polypropylene tanks with overlayed sand-and-stone layers for macrophytes growth. During the digestion the parameters principally monitored were pH, alkalinity, volatile acids, setteable and total suspended solids to control the process. After the digestion process, the supernatants was retained in the beds 21 days long, giving rise to a COD reduction of 84,7%, phosphorus 39,3% and nitrate 37,1%. A mathematical model was developed to facilitate the cultivated-bed construction helping in its dimensioning during the project phase. The treated supernatants may be used to wash housing where swine are kept or may be launched on soil in a controlled way. The system may represent an effective treatment alternative generating byproducts that may be used in the rural property, and has a low-cost establishment to the minor producer.