Enhanced Anaerobic Digestion of Long Chain Fatty Acid by Adding Magnetite and Carbon Nanotubes

Mostafa, Alsayed; Im, Seongwon; Song, Young-Chae; Kang, Seoktae; Kim, Dong-Hoon

doi:10.3390/microorganisms8030333

Cited by 38 publications

(18 citation statements)

References 68 publications

(102 reference statements)

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“…This can justify the enhanced CH 4 productivity, as CBCM are supplemented ( Table 2). In case of IBCM, the electrical conductivity might have more remarkable impact than surface area [43,80]. Further study concluded that magnetite could play double role, i.e., (i) stimulating the up-regulated secretion of key enzymes that are involved in the substrate degradation and (ii) inducing the expression of DIET-related proteins [60].…”

Section: As a Tool For Diet Pathway Stimulationmentioning

confidence: 98%

“…Even, slight negative impact (−4%, compared to control) upon cumulative CH 4 production yield was observed by magnetite addition [62]. But, some reports showed that an increase in CH 4 yield can be also observed after CM supplementation [43,63]. DIET-stimulated digesters were also able to sustain against the harsh operational conditions, e.g., accumulation of sulfate [47] or ammonia [48] or phenol [29].…”

Section: As a Tool For Diet Pathway Stimulationmentioning

confidence: 98%

“…For instance, when overall energy yield from a certain reaction is limited, the consumption of energy for generating metabolite, as electron shuttles, can be unfavored; instead, DIET in such case can be the optimal choice for energy saving [10,38]. For example, DIET could dominate over other IIET routes, when the system was subjected to acidic inhibition [45,46], toxic substrate [29,43], sulfate-rich wastewater [47], or ammonia containing wastewater [48].…”

Section: Diet-caused Theoretical Advantagesmentioning

confidence: 99%

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Enhanced Anaerobic Digestion by Stimulating DIET Reaction

Mostafa

Song

et al. 2020

Processes

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Since the observation of direct interspecies electron transfer (DIET) in anaerobic mixed cultures in 2010s, the topic “DIET-stimulation” has been the main route to enhance the performance of anaerobic digestion (AD) under harsh conditions, such as high organic loading rate (OLR) and the toxicants’ presence. In this review article, we tried to answer three main questions: (i) What are the merits and strategies for DIET stimulation? (ii) What are the consequences of stimulation? (iii) What is the mechanism of action behind the impact of this stimulation? Therefore, we introduced DIET history and recent relevant findings with a focus on the theoretical advantages. Then, we reviewed the most recent articles by categorizing how DIET reaction was stimulated by adding conductive material (CM) and/or applying external voltage (EV). The emphasis was made on the enhanced performance (yield and/or production rate), CM type, applied EV, and mechanism of action for each stimulation strategy. In addition, we explained DIET-caused changes in microbial community structure. Finally, future perspectives and practical limitations/chances were explored in detail. We expect this review article will provide a better understanding for DIET pathway in AD and encourage further research development in a right direction.

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Section: As a Tool For Diet Pathway Stimulationmentioning

confidence: 98%

Section: As a Tool For Diet Pathway Stimulationmentioning

confidence: 98%

Section: Diet-caused Theoretical Advantagesmentioning

confidence: 99%

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Enhanced Anaerobic Digestion by Stimulating DIET Reaction

Mostafa

Song

et al. 2020

Processes

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“…For each bottle, the substrate concentration and inoculum to substrate ratio were adjusted to be 2.0 g COD/L and 5.0 g volatile suspended solids (VSS)/g COD, respectively. Trace metals and nutrients were added to batch bottles [28,29]. Initial pH was adjusted to 7.5 ± 0.1 using KOH (2 N) and HCl (2 N) solutions, then purging was done for the serum bottles using 99.99% N 2 gas for 10 min for securing anaerobic condition.…”

Section: Pretreatment and Bmp Testmentioning

confidence: 99%

Series of Combined Pretreatment Can Affect the Solubilization of Waste-Activated Sludge

Mostafa

Kim

et al. 2020

Energies

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Various pretreatment methods have been combined and employed for maximizing the solubilization of waste-activated sludge (WAS). However, the question “by changing the series of applied combined pretreatments (CPs), can the solubilization efficiency of WAS be affected?” has never been addressed. In this study, firstly, thermal (T), alkaline (A), and ultrasonic (U) pretreatments were individually applied at broad strengths (T = 80–120 °C for 30 min, A = pH 9–12, and U = 5–60 min at 300 W). Then, pretreatment conditions that caused similar solubilization (13.0%) (120 °C, pH 11, and 30 min for T, A, and U, respectively), were adopted for CP with reverse sequences of T&A, U&A, and T&U. A similar disintegration degree was observed in U→A and A→U, while a meaningful difference was found in T&A and T&U: T→A (28.3%), A→T (42.9%), T→U (22.9%), and U→T (27.1%). The difference in pretreatment series also affected the characteristics of soluble matters, which was analyzed by excitation emission matrix and molecular weight distribution. Due to these differences, the highest methane yield of 68.8% (based on (chemical oxygen demand) CODinput) was achieved at A→T, compared to T→A (62.3%). Our results suggested a simple strategy for increasing solubilization, at the same expense of energy, which might be beneficial in the following treatment process, such as dewatering and transportation.

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“…苯甲酸在共培养体系中被证实可作为DIET的底物 [33] , 及导电磁铁介导的DIET产甲烷途径可加快矿稻田土壤中互养代谢苯甲酸为甲烷 [29] , 暗示难降解复杂有机物代谢可通过DIET产甲烷途径. 除苯甲酸之外, 导电材料介导的DIET产甲烷途径还可强化厌氧消化系统中甘油 [41] 、油酸 [67] 、蔗糖 [40] 、胰蛋白胨 [90] 和苯酚 [34] 等复杂有机物降解. Wang等人 […”

Section: 强化降解unclassified