In this study, food waste (FW) was added into source-diverted blackwater (BW) to enhance biomethane production using an upflow anaerobic sludge blanket (UASB) reactor at 35 °C. Increasing amount of FW was introduced into the BW according to the BW:FW volatile solids (VS) mixing ratios ranging from 1:0.3 (BW:FW) to 1:1.5. The optimal biomethane recovery efficiency was achieved when BW:FW VS mixing ratio was 1:1, corresponding to an organic loading rate (OLR) of 10.0 (± 0.5) kg chemical oxygen demand (COD)/m³/day, which is 2.5 times of the highest OLR reported in the literature for BW treatment (4.1 kg COD/m³/day). Under this condition, a methane production rate of 2.42 (± 0.15) L/L/day (highest biomethane recovery efficiency for BW treatment studies reported to date) was achieved, which represented 96.8 MJ/m³/day heat recovery. The enhanced biomethane production was attributed to the significantly improved solid substrate hydrolysis efficiency (85.9% higher than BW only) and microbial activities (sludge hydrogenotrophic methanogenic activities 2.4 times higher than BW only). Further OLR increase with more FW addition led to a reduction in methane production due to insufficient sludge retention. It can be concluded that anaerobic co-digestion of BW and FW is an attractive approach to maximize biomethane recovery efficiency from domestic wastewater in future decentralized wastewater treatment facilities.

在这项研究中，将食物废物（FW）添加到源改道的黑水（BW）中，以使用35°C的上流厌氧污泥床（UASB）反应器来提高生物甲烷的产生。根据BW：FW挥发性固体（VS）的混合比（从1：0.3（BW：FW）到1：1.5），将越来越多的FW引入到BW中。当BW：FW VS混合比为1：1时，可获得最佳的生物甲烷回收效率，对应于有机负荷率（OLR）为10.0（±0.5）kg化学需氧量（COD）/ m ³ /天，即2.5文献中报道的BW治疗最高OLR的次数（4.1 kg COD / m ³/天）。在此条件下，甲烷产量达到2.42（±0.15）L / L /天（迄今为止报道的BW处理研究中最高的生物甲烷回收效率），代表96.8 MJ / m ³ /天的热回收率。生物甲烷产量的增加归因于固体底物水解效率（仅比BW高85.9％）和微生物活性（污泥的氢营养甲烷化活性比仅BW高2.4倍）显着提高。由于污泥滞留量不足，进一步增加FW并增加FW导致甲烷产量减少。可以得出结论，在未来的分散式废水处理设施中，BW和FW的厌氧共消化是一种最大化从生活废水中回收生物甲烷的有效方法。