Abstract
The objective of this study was to assess a cattle manure treatment system with aerated tanks in a “free-stall” confinement system, where the recycled wastewater was used to clean the facilities and the effluent was applied to forage cultivation areas. A batch activated sludge reactor with a prolonged intermittent aeration system scaled to a 24-day hydraulic retention time was used, and the wastewater was diluted at a volume ratio of 1:1. Samples were taken at the input and interior of the aeration tanks, at the irrigation pipe exit, and from pure animal waste. The following parameters were determined: pH, temperature, oil and grease, total biochemical oxygen demand (BOD) and chemical oxygen demand (COD), total solids, total nitrogen and ammoniacal nitrogen, potassium, phosphorus, and magnesium. The results indicated that the aerobic biological treatment is effective in reducing and stabilising organic matter in wastewater.
Highlights
Milk production in Minas Gerais State is a socially, economically, and environmentally important activity
A batch activated sludge reactor with a prolonged intermittent aeration system scaled to a 24day hydraulic retention time was used, and the wastewater was diluted at a volume ratio of 1:1
A large number of confined cattle generate a high volume of manure, leading to increased pollution and environmental degradation
Summary
Milk production in Minas Gerais State is a socially, economically, and environmentally important activity. It is responsible for providing numerous jobs and is the main source of income and work for farmers. Milk production negatively affects the environment because of the large amount of waste that is produced daily. Dairy cattle housed under confined conditions generate large amounts of waste, and space for disposal is usually limited (GONÇALVES JÚNIOR et al, 2007). In addition to physical limitations for waste disposal, carbon dioxide (CO2) and methane (CH4) are emitted, water sources are eutrophicated, and soil is polluted, mainly from nitrogen and phosphorus accumulation (GÜNGÖRDEMIRCI; DEMIRER, 2004; ANGONESE et al 2006; DEMIRER; CHEN, 2005)
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