Research group on Water Resources and Environmental Sanitation, Western Parana State University, Agricultural Engineering Graduate Program, Rua Universitária, Jardim Universitário, 2069, 85819-110 Cascavel, Paraná, Brazil.
Research group on Water Resources and Environmental Sanitation, Western Parana State University, Agricultural Engineering Graduate Program, Rua Universitária, Jardim Universitário, 2069, 85819-110 Cascavel, Paraná, Brazil.
Waste Manag. 2015 Dec;46:612-8. doi: 10.1016/j.wasman.2015.08.040. Epub 2015 Sep 2.
Sheep manure pellets are peculiarly shaped as small 'capsules' of limited permeability and thus are difficult to degrade. Fragmentation of manure pellets into a homogeneous mass is important for decomposition by microorganisms, and occurs naturally by physical shearing due to animal trampling, when sheep bedding is used. However, the high lignocellulose content of sheep bedding may limit decomposition of sheep manure. Here, we evaluated if co-digestion of sheep bedding with cattle manure would improve the yield and quality of the useful products of anaerobic digestion of sheep bedding--biogas and biofertilizer--by providing a source of nutrients and readily available carbon. Mixtures of sheep bedding and cattle manure in varying proportions (0%, 25%, 50%, 75%, or 100% cattle manure) were added to 6-L digesters, used in a batch system, and analyzed by uni and multivariate statistical tools. PC1, which explained 64.96% of data variability, can be referred to as 'organic fraction/productivity', because higher rates of organic fraction consumption (COD, cellulose and hemicellulose contents) led to higher digester productivity (biogas production, nutrient concentration, and sample stability changes). Therefore, productivity and organic fraction variables were most influenced by manure mixtures with higher (⩾ 50%) or lower (⩽ 25%) ratios of cattle manure, respectively. Increasing the amount of cattle manure up to 50% enhanced the biogas potential production from 142 L kg(-1)TS (0% of cattle manure) to 165, 171, 160 L biogas kg(-1)TS for the mixtures containing 100%, 75% and 50% of cattle manure, respectively. Our results show that the addition of ⩾ 50% cattle manure to the mixture increases biogas production and improves the quality of the final biofertilizer.
羊粪球的形状很特别，呈小“胶囊”状，具有有限的渗透性，因此难以降解。为了便于微生物分解，羊粪球需要破碎成均质物质，这在使用羊垫料时自然会发生，因为羊踩踏会导致物理剪切。然而，羊垫料中较高的木质纤维素含量可能会限制羊粪的分解。在这里，我们评估了将羊垫料与牛粪混合进行共消化是否可以通过提供养分和易利用的碳源来提高羊垫料厌氧消化的有用产物（沼气和生物肥料）的产量和质量。将不同比例（0%、25%、50%、75%或 100%的牛粪）的羊垫料和牛粪混合物添加到 6-L 消化器中，使用分批系统进行分析，并通过单变量和多变量统计工具进行分析。可以将解释了 64.96%数据变异性的 PC1 称为“有机部分/生产力”，因为较高的有机部分消耗率（COD、纤维素和半纤维素含量）导致更高的消化器生产力（沼气产量、养分浓度和样品稳定性变化）。因此，生产力和有机部分变量受具有较高（⩾50%）或较低（⩽25%）牛粪比例的粪便混合物的影响最大。将牛粪的添加量增加到 50%，可以将 142 L kg(-1)TS（0%的牛粪）的沼气潜在产率提高到 165、171、160 L 沼气 kg(-1)TS，分别对应混合物中含有 100%、75%和 50%的牛粪。我们的结果表明，在混合物中添加 ⩾50%的牛粪可以提高沼气产量并改善最终生物肥料的质量。
