The objective of this study was to determine methane yields (MY) of organic wastes in biogasification facilities according to the mixing ratio of food waste/food waste leachate and sewage sludge. One biogasification facility that treated sewage sludge only was compared with three biogasification facilities treating sewage sludge and food waste. The theoretical MY was derived based on analyses of carbohydrate, fat, and protein to examine the efficiency of the biogasification facility. The average actual MY was 0.424 Sm3CH4/kg volatile solids, which corresponded to 83.7% of theoretical MY. In the case of combined anaerobic digestion (CD) mixing with food waste/food waste leachate, inhibitory factors (volatile fatty acids [VFAs], total nitrogen [TN], and organic matter contents) showed the tendency to have relatively higher values in CD facilities than in the biogasification facility treating sewage sludge only. Mean concentrations of VFAs and TN in the anaerobic digester effluent, and the organic loading rate were 406 mg/L, 3,721 mg/L, and 1.62 kg volatile solids/m3 day, respectively. The influence of anaerobic digester effluent was in charge of 10% within the influent environmental loading rate from the sewage treatment plants associated with the biogasification facilities. Analyses of the microbial community showed that a remarkable change in the structure of methanogens was directly related to different MY in each plant. In particular, Methanoculleus and Methanosaeta increased with an increasing ratio of food waste/food waste leachate to sludge, while Methanococcus and Methanosarcina decreased. In conclusion, CD showed steady operational conditions and high efficiency of MY by injecting food waste/food waste leachate into the anaerobic digester. It met the current criteria for integrated treatment of organic waste in biogasification facilities in South Korea.

中文翻译：

---

添加食物垃圾渗滤液原位厌氧污水污泥消化的沼气潜力和产甲烷菌群落转移

这项研究的目的是根据食物垃圾/食物垃圾渗滤液和污水污泥的混合比确定生物气化设施中有机垃圾的甲烷产量（MY）。将一个仅处理污水污泥的生物气化设施与三个处理污水污泥和食物垃圾的生物气化设施进行了比较。理论上的MY是基于对碳水化合物，脂肪和蛋白质的分析得出的，以检查生物气化设施的效率。平均实际MY为0.424 Sm3CH4 / kg挥发性固体，相当于理论MY的83.7％。如果将厌氧消化（CD）与食物垃圾/食物垃圾渗滤液混合使用，则抑制因子（挥发性脂肪酸[VFA]，总氮[TN]，和CD中的有机物含量显示出比仅处理污水污泥的生物气化设备中具有更高价值的趋势。厌氧消化池出水中VFA和TN的平均浓度以及有机负荷率分别为406 mg / L，3721 mg / L和1.62 kg挥发性固体/ m3天。在与生物气化设施相关的污水处理厂的进水环境负荷率内，厌氧消化池废水的影响控制在10％以内。对微生物群落的分析表明，产甲烷菌的结构的显着变化与每种植物中不同的MY直接相关。尤其是，随着食物垃圾/食物垃圾渗滤液与污泥的比例增加，甲烷菌和甲烷菌增多，而甲烷球菌和甲烷菌减少了。总之，通过将食物垃圾/食物垃圾渗滤液注入厌氧消化池，CD显示出稳定的运行条件和高效率的MY。它符合韩国生物气化设施中有机废物综合处理的现行标准。