Enhanced sludge thermophilic anaerobic digestion performance by single-chambered microbial electrolysis cells under ammonia inhibition

Zhang, Qingfang; Zhao, Mingwei; Wang, Tianfeng; Zeng, Liyuan; Bai, Chengxiang; Wu, Ruoyu; Xing, Zhijie; Guo-guang, Xiao; Shi, Xiaohui

doi:10.1016/j.jece.2022.107802

Cited by 9 publications

(6 citation statements)

References 37 publications

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“…The high FAN concentration was due to the accumulation of VFA, and the high FAN concentration will increase pH and total alkalinity, which will subsequently lead to changes in the hydrolytic bacterial community [46]. FAN proportion in TAN is determined by temperature and pH [53]. Therefore, the FAN level of mesophilic digesters was significantly lower than that of thermophilic digesters (Figure 2).…”

Section: Digestion Performancementioning

confidence: 99%

Comparison of Anaerobic Co-Digestion of Buffalo Manure and Excess Sludge with Different Mixing Ratios under Thermophilic and Mesophilic Conditions

Zhou

Sheng

et al. 2023

Sustainability

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In this study, the main aim is to evaluate the mixing ratio of co-digestion of buffalo manure (BM) and excess sludge (ES) influenced for methane yield and digestate dewaterability. Five batch experiments with different BM and ES mixing ratios were carried out under thermophilic and mesophilic conditions. The methane yield of co-digestion of BM and ES increased by 10.1–73.5% under thermophilic conditions and 87.9–153.3% under mesophilic conditions, compared with the mono-anaerobic digestion of ES under the same conditions. Shannon and Chao1 indices showed that the bacterial species of the mesophilic digesters were more abundant than that of the thermophilic digesters. With the increase in the BM proportion in the substrate, the normalized capillary suction time (NCST) and total solids (TS) of sediment (centrifugal dewatering) increased. The NCST at thermophilic temperature (8.98–12.54 s∙g−1-TS) was greater than that at the mesophilic temperatures (5.45–12.32 s∙g−1-TS). However, the TS of sediment was not directly related to the digestion temperature. This study has shown that anaerobic co-digestion of BM and ES at the appropriate ratio (BM/ES = 1:1.5) has a significant meaning in a high methane yield.

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Section: Digestion Performancementioning

confidence: 99%

Comparison of Anaerobic Co-Digestion of Buffalo Manure and Excess Sludge with Different Mixing Ratios under Thermophilic and Mesophilic Conditions

Zhou

Sheng

et al. 2023

Sustainability

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“…By comparing the changes in TAN and FAN levels in the control group (Figure 1e,f), it was found that the TAN and FAN levels in the thermophilic digesters were significantly higher than those in the mesophilic digesters, and with a wider variation range. This was because the thermophilic conditions promoted the degradation of nitrogen-rich substances and the solubility of organic matter in the co-substrate, resulting in more thorough organic matter degradation and a faster rate of TAN production [45]. The TAN level in the experimental group did not show a significant difference compared to the control group, but the FAN level in the experimental group was much lower than that in T0 of the control group.…”

Section: Methodsmentioning

confidence: 87%

“…FAN was present in TAN, which increased as the digestate pH a ature increased [29]. Compared with TAN, FAN had direct toxicity could penetrate microbial cell membranes, causing damage to enzy comparing the changes in TAN and FAN levels in the control group found that the TAN and FAN levels in the thermophilic digesters wer than those in the mesophilic digesters, and with a wider variation ran the thermophilic conditions promoted the degradation of nitrogen the solubility of organic ma er in the co-substrate, resulting in mo ma er degradation and a faster rate of TAN production [45]. The TA The TAN level in both the experimental and control groups was between 1500 and 2500 mg L −1 at the end of digestion (Figure 1c,d), indicating that all methanogens in this experiment might have been affected by ammonia inhibition.…”

Section: Methodsmentioning

confidence: 99%

Effects of One-Step Abrupt Temperature Change on Anaerobic Co-Digestion of Kitchen Waste with Dewatered Sludge

Hu,

Zhou,

Zhu

et al. 2023

Fermentation

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The operating temperature of anaerobic digesters should be adjusted to adapt to seasonal variations in environmental temperature and the composition of organic solid waste. This study investigated the effects of one-step abrupt temperature changes (from mesophilic to thermophilic temperature, M–T, and from thermophilic to mesophilic temperature, T–M) and the inoculation ratio on methane yield and microbial diversity during the anaerobic co-digestion of kitchen waste with dewatered sludge. The results showed that the cumulative methane yield (CMY) level resulting from thermophilic control and the M–T digesters was greater than that resulting from mesophilic control and the T–M digesters. The CMF of M–T digesters increased, whereas the CMY of T–M digesters gradually decreased with an increase in the inoculation ratio. The maximal CMY was 385.1 mL/g-VSSadded, which corresponded to an M–T digester with a 5% inoculation ratio. In the later stage of anaerobic digestion, the bacterial community of T–M was more diverse than that of M–T, but the archaeal community of M–T was more diverse than that of T–M. The one-step temperature change from thermophilic to mesophilic temperature was more stable than that from mesophilic to thermophilic temperature.

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“…Zhang et al [108] studied single-chambered MECs combined with thermophilic anaerobic digesters for the digestion of ammonia-rich synthetic substrates and sludge under high FAN concentrations. The results showed that the highest methane yields from both the substrates were obtained at an applied voltage of 0.7 V as 25 and 97.8 mL g −1 VSS added for synthetic substrates and sludge, respectively.…”

Section: Adoption Of Emerging Technologies 621 Bioelectrochemical Tec...mentioning

confidence: 99%

Thermophilic Anaerobic Digestion: An Advancement towards Enhanced Biogas Production from Lignocellulosic Biomass

et al. 2023

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Thermophilic anaerobic digestion (TAD) technology has been adopted worldwide mainly due to it being a pathogen-free process in addition to the enhanced biogas yield and short hydraulic retention time (HRT). Taking the high metabolic rate of the thermophilic microbial community with highly efficient enzymatic systems into consideration, thermophiles are being widely explored as efficient inocula for lignocellulosic biomass (LCB) degradation and improved biomethane production. The advantages of TAD over mesophilic anaerobic digestion (MAD), including improved kinetics, efficient degradation of organic matter, and economic and environmental sustainability, make it one of the best strategies to be operated at moderately high temperatures. This review sheds light on the relevant role of thermophilic microorganisms as inocula in the anaerobic digestion of organic matter and factors affecting the overall process stability at high temperatures. Further, the discussion explains the strategies for enhancing the efficiency of thermophilic anaerobic digestion.

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Enhanced sludge thermophilic anaerobic digestion performance by single-chambered microbial electrolysis cells under ammonia inhibition

Cited by 9 publications

References 37 publications

Comparison of Anaerobic Co-Digestion of Buffalo Manure and Excess Sludge with Different Mixing Ratios under Thermophilic and Mesophilic Conditions

Comparison of Anaerobic Co-Digestion of Buffalo Manure and Excess Sludge with Different Mixing Ratios under Thermophilic and Mesophilic Conditions

Effects of One-Step Abrupt Temperature Change on Anaerobic Co-Digestion of Kitchen Waste with Dewatered Sludge

Thermophilic Anaerobic Digestion: An Advancement towards Enhanced Biogas Production from Lignocellulosic Biomass

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