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      저자 : ( Danling Xia ) (검색결과 2 건)
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      • Methane Recovery from NaCl Inhibition of Food Waste Anaerobic Digestion

        ( Jae Hac Ko ),( Danling Xia ),( Qiyong Xu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2020 한국폐기물자원순환학회 추계학술발표논문집 Vol.2020 No.-

        One of the big challenges of food waste anaerobic digestion is the inhibition of high NaCl concentrations. This study investigated the effects of NaCl fluctuation on the methane generation of food waste anaerobic digestion under both thermophilic and mesophilic conditions, especially focusing on shock loading of high NaCl concentration with/without water dilution treatment. In general, methane generation decreased with increasing the concentration of NaCl concentrations. Thermophilic AD was more sensitive to NaCl concentration change at the range of 5-10 g/L. When NaCl concentration increased from 0 g/L to 30 g/L, the accumulative methane volumes of thermophilic and mesophilic reactors decreased from 420 mL to 133 mL and from 529 mL to 133 mL, respectively. With increasing NaCl concentration, pH of digestate decreased while COD and VFA concentrations increased. Results indicated that a shock-loading of NaCl significantly reduced methane generation. Using water dilution as a remedial measure, the methane generation rates could be recovered up to 64% - 72%. Further investigation with 16S rRNA analysis showed that the predominant genus of methanogens shifted from Methanoculleus to Methanosarcina after removal of osmotic stress by water dilution.

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        Methane Production of Food Waste Anaerobic Digestion Recovered from NaCl Inhibition by Water Dilution

        ( Eunil Cho ),( Qiyong Xu ),( Danling Xia ),( Jae Hac Ko ) 한국폐기물자원순환학회 2021 한국폐기물자원순환학회지 Vol.38 No.4

        One of the significant challenges of food waste anaerobic digestion (AD) is the negative effect of high NaCl concentrations. This study investigated the effects of NaCl fluctuation on the methane generation of food waste AD under thermophilic and mesophilic conditions. Particularly, the effects of the shock loading of high NaCl concentration with/ without water dilution treatment were investigated. Generally, the methane generation decreased with increasing NaCl concentration. In addition, the sensitivity of the thermophilic AD to NaCl concentrations (5-10 g/L) was higher than that of the mesophilic AD. Furthermore, with an increase in the NaCl concentration from 0 to 30 g/L, the accumulative methane volumes of the thermophilic reactors decreased from 210 to 45 mL/gVS, and those of the mesophilic reactors decreased from 265 to 67 mL/gVS. Additionally, the pH of digestate decreased with increasing NaCl concentration. In contrast, the concentrations of the chemical oxygen demand and volatile fatty acid increased with increasing NaCl concentration. These results indicated that a shock loading of NaCl significantly reduced methane generation. In addition, the methane generation rates could be recovered up to 64-72% using water dilution as a remedial measure. Further investigation using 16S rRNA analysis revealed that the predominant genus of the methanogens shifted from Methanoculleus to Methanosarcina after the removal of the osmotic stress using water dilution.

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