Abstract
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.
Highlights
Due to social aspects such as population growth, urbanization, and industrialization, the amount of organic wastes hasBae et al Appl Biol Chem (2020) 63:62 process, and is a novel response to the current situation [7, 8].Biogasification facilities in sewage treatment plants in South Korea have a low anaerobic digestion efficiency compared to those in developed countries such as Europe due to relatively low influent concentrations with a low enrichment rate, a lack of knowledge on operating technology by process flow, and inadequate management [9, 10]
Sewage treatment without an anaerobic digestion tank is reviewed with treatment of food wastes
The total treatment capacity of biogasification facilities was 59,204 ton/day, which was an increase of 4.7% from the previous year
Summary
Biogasification facilities in sewage treatment plants in South Korea have a low anaerobic digestion efficiency (only 54.2%) compared to those in developed countries such as Europe due to relatively low influent concentrations with a low enrichment rate, a lack of knowledge on operating technology by process flow, and inadequate management [9, 10]. Sewage treatment without an anaerobic digestion tank is reviewed with treatment of food wastes. In 2016, the number of biogasification facilities in South Korea that could treat organic wastes was increased by two (2.3% increment) compared to the previous year (90 facilities). The total treatment capacity of biogasification facilities was 59,204 ton/day, which was an increase of 4.7% from the previous year. Among facilities for treating organic wastes, sewage sludge biogasification facility showed a high increase rate compared to other facilities for treating organic wastes. The average annual operation rate of biogasification facilities was only 32% [14]
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