Effects of adding EDTA and Fe2+ on the performance of reactor and microbial community structure in two simulated phases of anaerobic digestion

Cai, Yafan; Hu, Kai; Zheng, Zicheng; Zhang, Yue; Guo, Shiyu; Xiao-ling, Zhao; Cui, Zongjun; Wang, Xiaofen

doi:10.1016/j.biortech.2018.12.050

Cited by 44 publications

(24 citation statements)

References 42 publications

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“…On the contrary, the biogas yields and methane contents in R2-R3 decreased slightly and then maintained stability, even at high OLRs. The change was consistent with previous studies, in which it was found that the addition of EDTA increases methane production by improving Fe bioavailability [17,18]. Vintiloiu [14] has also demonstrated that the addition of EDTA-Ni has a simulative effect on biogas production and the stability of the AD process.…”

Section: Methane Productionsupporting

confidence: 91%

“…Conversely, the continuous addition of EDTA had no negative impact on AD in this study. However, recent research has suggested no obvious changes of methane production are observed with Fe or EDTA-Fe addition in the AD process of rice straw, while EDTA addition alone enhances methane production [18]. This might be due to a big difference in the background value of Fe between rice straw and KWs.…”

Section: Methane Productionmentioning

confidence: 94%

“…In fact, before supplemented Fe 2+ coming into contact with microorganisms, it may precipitate with S 2− , CO 3 2− , or PO 4 3− , or complex with organic/inorganic ligands, which reduces the bioavailability of Fe [17]. In order to artificially enhance Fe bioavailability and decrease Fe dosage, some chelating agents have been used to form soluble complexes with Fe before their addition into an AD reactor [14,18]. Zhang [17] has reported that ethylenediamine-N,N'-disuccinic acid (EDDS) chelated with Fe 2+ enhances the OLRs to 6.0 gVS•L −1 •d −1 and decreases the Fe 2+ dosage by 50% in AD of food waste.…”

Section: Introductionmentioning

confidence: 99%

“…Zhang [17] has reported that ethylenediamine-N,N'-disuccinic acid (EDDS) chelated with Fe 2+ enhances the OLRs to 6.0 gVS•L −1 •d −1 and decreases the Fe 2+ dosage by 50% in AD of food waste. Nevertheless, the high price of EDDS limits its application in AD [18]. Another common chelating agent, ethylenediaminetetraacetic acid (EDTA), has been successfully used in wastewater treatment, the food industry, and soil remediation [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, EDTA has shown its potential in enhancing biogas production from agricultural waste [14,18]. However, there have been no semi-continuous or continuous experiments aimed at investigating the effects of EDTA on Fe bioavailability and methane production from KWs.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Anaerobic Performances of Kitchen Wastes in a Semi-Continuous Reactor by EDTA Improving the Water-Soluble Fraction of Fe

2019

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The addition of Fe2+ is considered an effective method for increasing methane production, but the added Fe2+ may not be absorbed by anaerobic microorganisms due to complex chemical reactions. In this study, ethylenediaminetetraacetic acid (EDTA) was used as a ligand of Fe2+ (EDTA-Fe) to promote the dissolution of Fe, and the anaerobic performances of kitchen wastes (KWs) in a semi-continuous reactor were studied. The results indicated that the biogas yields and methane contents were enhanced to 594–613 mL·g−1VSadd·d−1 and 63.6–64.4% at an organic loading rate (OLR) of 2.5 gVSadd·L−1·d−1 due to EDTA-Fe addition. Simultaneously, the EDTA-Fe was more effective than Fe2+ in preventing the acidification of KWs with a high OLR (5.0 gVSadd·L−1·d−1). In addition, the sequential extraction results showed that the water-soluble fraction of Fe in the R3 (EDTA-Fe addition) was 1.49-fold of that in the R2 with Fe2+ addition. The contents of coenzymes F420 and F430 were also improved 1.09 and 1.11 times, respectively. Mechanism analysis confirmed that the EDTA enhanced methane production and operational stability by promoting the dissolution of Fe and maintaining a high content of water-soluble Fe.

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Section: Methane Productionsupporting

confidence: 91%

Section: Methane Productionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhanced Anaerobic Performances of Kitchen Wastes in a Semi-Continuous Reactor by EDTA Improving the Water-Soluble Fraction of Fe

2019

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Effect of the addition of fly ash on the specific methane production and microbial communities in the anaerobic digestion of real winery wastewater

Lauzurique

Fermoso

Sánchez

et al. 2021

J of Chemical Tech & Biotech

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BACKGROUND Fly ash is an important source of trace elements that can act as cofactors of enzyme systems and improve anaerobic digestion processes. However, its effect on anaerobic digestion using real wastewater has not yet been studied. In the present work, the effect of fly ash on the anaerobic digestion of real winery wastewaters was studied, by means of specific methanogenic activity assays and with a special focus on its effect on the specific methane production and the microbial communities present. Five fly ash concentration (25, 50, 75, 100, and 150 mg L−1) were supplemented under mesophilic conditions. RESULTS The results showed that 25 mg L−1 of fly ash improved the specific methane production by 18% compared to the control assay; meanwhile, a concentration of 100 mg L−1 of fly ash generated inhibition of the methanogenesis and a 20% specific methane production decrease with respect to the control experiment. The microbial community analysis verified that fly ash supplementation affected the bacterial communities, with a significant effect on acetogenic bacteria, such as Cloacimonetes and Firmicutes. CONCLUSION The addition of adequate concentrations of fly ash to the process can raise the relative abundance of some microorganisms and, consequently, could increase the specific methane production in the anaerobic digestion of winery wastewater. © 2021 Society of Chemical Industry (SCI).

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Additives to Enhance the Performance and Mechanism of Biogas Production from Agricultural Wastes: A Mini-review

Gu,

Xing,

et al. 2024

Water Air Soil Pollut

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Effects of adding EDTA and Fe2+ on the performance of reactor and microbial community structure in two simulated phases of anaerobic digestion

Cited by 44 publications

References 42 publications

Enhanced Anaerobic Performances of Kitchen Wastes in a Semi-Continuous Reactor by EDTA Improving the Water-Soluble Fraction of Fe

Enhanced Anaerobic Performances of Kitchen Wastes in a Semi-Continuous Reactor by EDTA Improving the Water-Soluble Fraction of Fe

Effect of the addition of fly ash on the specific methane production and microbial communities in the anaerobic digestion of real winery wastewater

Additives to Enhance the Performance and Mechanism of Biogas Production from Agricultural Wastes: A Mini-review

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