Much of the global population lacks access to basic public sanitation, energy and fertilizers. Micro-scale anaerobic digestion presents an opportunity for low-cost decentralized waste management that creates valuable co-products of renewable energy and organic fertilizer. However, field-based assessments of system performance and clearly articulated guidelines for digestate management and field application are needed. Feedstocks and effluent from seven digesters in Kampala, Uganda were monitored for standard wastewater and fertilizer metrics including indicator organisms (Escherichia coliand fecal coliform), chemical oxygen demand (COD), biological oxygen demand (BOD5), total Kjeldahl nitrogen (TKN), total phosphorous (TP), heavy metals, pH, temperature and total solids (TS) over 2 yr. Results reveal that digester effluent does not meet standards for wastewater discharge or international safety standards for field application. Data indicate that digestate could be a suitable source of fertilizer (TKN = 1467 mg L−1, TP = 214 mg L−1) but poses issues for water quality if not managed properly (TS = 26,091 mg L−1, COD = 3471 mg L−1and BOD5= 246 mg L−1). While effluent from the digester contained pathogen indicator organisms (fecal coliform = 8.13 × 105CFU/100 ml,E. coli= 3.27 × 105CFU/100 ml), they were lower than the influent concentrations, and lower than reported concentrations in drainage canals. All digestate samples contained little to no heavy metals suggesting effective source separation. Data suggest that micro-scale biogas systems have potential to improve waste handling and meet standards associated with fertilizer application with proper post-digestion treatment.

中文翻译：

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乌干达的厌氧消化：废物管理和农业系统整合的风险和机遇

全球大部分人口无法获得基本的公共卫生设施、能源和化肥。微型厌氧消化为低成本分散式废物管理提供了机会，可创造可再生能源和有机肥料的有价值的副产品。然而，需要对系统性能进行基于现场的评估，并明确阐明消化物管理和现场应用的指导方针。监测乌干达坎帕拉七个沼气池的原料和流出物的标准废水和肥料指标，包括指示生物（大肠杆菌和粪便大肠菌）、化学需氧量 (COD)、生物需氧量 (BOD)5)、总凯氏定氮 (TKN)、总磷 (TP)、重金属、pH、温度和总固体 (TS) 超过 2 年。结果表明，沼气池出水不符合废水排放标准或现场应用的国际安全标准。数据表明消化物可能是合适的肥料来源（TKN = 1467 mg L-1, TP = 214 毫克/升-1），但如果管理不当会导致水质问题（TS = 26,091 mg L-1, COD = 3471 毫克/升-1和BOD5= 246 毫克/升-1）。虽然来自消化器的流出物含有病原体指示生物（粪便大肠菌群 = 8.13 × 105CFU/100 毫升，大肠杆菌= 3.27 × 105CFU / 100 ml），它们低于进水浓度，也低于排水渠中报告的浓度。所有消化物样品几乎不含重金属，表明有效的源分离。数据表明，微型沼气系统具有改善废物处理的潜力，并通过适当的消化后处理达到与施肥相关的标准。