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首页> 外文会议>Annual International Meeting of the American Society of Agricultural and Biological Engineers >Methane Production and Water Quality Improvements in Agricultural Biodigesters in Costa Rica
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Methane Production and Water Quality Improvements in Agricultural Biodigesters in Costa Rica

机译：哥斯达黎加农业生物沸虫的甲烷生产和水质改善

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In developing countries, water pollution and access to energy resources are interrelated challenges that encompass issues of human health, environmental protection, and economic development. Anaerobic biodigesters utilize on-site animal waste to simultaneously reduce water pollutants and produce methane gas for cooking or electricity generation. Seven low-cost biodigesters located in the Limon Province of Costa Rica on small-scale farms were studied to determine wastewater treatment ability and methane production potential of these systems. Twelve environmental parameters were studied for each biodigester to determine the quality of methane produced and improvements in water quality. The variability among wastewater at the seven biodigesters was examined to determine the influence of wastewater differences on methane production. The biodigesters in this study consistently reduced organic matter and solids by 79% - 91%. Total kjeldahl nitrogen (TKN) was decreased by 46%. Ammonium (NH_4-N) increasedduring the digestion process, which increased the usefulness of the effluent as an organic fertilizer. Methane concentrations in the biogas averaged 65%. Through principle component analysis and multivariate analysis of variance (MANOVA), chemical oxygendemand (COD), turbidity, NH_4-N, TKN, and pH were determined to be the most useful parameters to characterize the wastewater. There were significant variations between the wastewater influent and effluent concentrations, but these variations did not significantly influence the methane concentrations produced within each biodigester. The biodigester outflow concentrations exhibited less variation than the inflow concentrations, which suggests that these systems are robust to fluctuations in influent wastewater concentration.
机译：在发展中国家，水污染和对能源资源的接受相关挑战，包括人类健康，环境保护和经济发展问题。 Anaerobic Biodigesters利用现场动物废物同时减少水污染物并产生甲烷气体以进行烹饪或发电。研究了位于小型农场的夏季哥斯达黎加豪华省的七个低成本生物铸造者，以确定这些系统的废水处理能力和甲烷生产潜力。研究了每种生物虫蛋白酯的12个环境参数，以确定生产的甲烷的质量和水质的改善。检查了七个生物沸虫的废水的变异性，确定了废水差异对甲烷生产的影响。本研究中的生物沸虫始终减少有机物质和固体率为79％-91％。总KJELDAHL氮（TKN）减少46％。铵（NH_4-N）增加了消化过程，从而增加了流出物作为有机肥料的有用性。沼气中的甲烷浓度平均为65％。通过原理分析和多变量分析方差（MANOVA），化学氧亚丁（COD），浊度，NH_4-N，TKN和pH值是最有用的表征废水的参数。废水流入和流出物浓度之间存在显着变化，但这些变化没有显着影响每种生物硫代酯内产生的甲烷浓度。生物铸酯流出浓度表现出比流入浓度较小的变化，这表明这些系统在流入的废水浓度的波动稳健。

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