Biochar Addition Increases the Rates of Dissimilatory Iron Reduction and Methanogenesis in Ferrihydrite Enrichments

Zhou, Guowei; Xiao, Yang; Marshall, C. W.; Li, Hu; Zheng, Bang-Xiao; Yan, Yu; Su, Jian; Zhu, Yan

doi:10.3389/fmicb.2017.00589

Cited by 31 publications

(9 citation statements)

References 73 publications

(117 reference statements)

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“…6 Correlation between the initial methane formation rate (mgCOD/L d) and the electron donating capacity (EDC) (meq/g) ( a ); the electron accepting capacity (EAC) (meq/g) ( b ); the electrical conductivity (S/m) ( c ), and the specific surface area (m 2 /g) ( d ) of the different biochars. Legend: (1) wheat bran (this study); (2) wood (this study); (3) orchard (this study); (4) pine [ 29 ]; (5–6) rice straw [ 62 ]; (7–9) rice straw [ 63 ]; (10) corn stover [ 64 ]; (11) pine [ 64 ] …”

Section: Resultsmentioning

confidence: 99%

Enhancing methane production from food waste fermentate using biochar: the added value of electrochemical testing in pre-selecting the most effective type of biochar

Viggi

Simonetti

Palma

et al. 2017

Biotechnol Biofuels

135

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BackgroundRecent studies have suggested that addition of electrically conductive biochar particles is an effective strategy to improve the methanogenic conversion of waste organic substrates, by promoting syntrophic associations between acetogenic and methanogenic organisms based on interspecies electron transfer processes. However, the underlying fundamentals of the process are still largely speculative and, therefore, a priori identification, screening, and even design of suitable biochar materials for a given biotechnological process are not yet possible.ResultsHere, three charcoal-like products (i.e., biochars) obtained from the pyrolysis of different lignocellulosic materials, (i.e., wheat bran pellets, coppiced woodlands, and orchard pruning) were tested for their capacity to enhance methane production from a food waste fermentate. In all biochar-supplemented (25 g/L) batch experiments, the complete methanogenic conversion of fermentate volatile fatty acids proceeded at a rate that was up to 5 times higher than that observed in the unamended (or sand-supplemented) controls. Fluorescent in situ hybridization analysis coupled with confocal laser scanning microscopy revealed an intimate association between archaea and bacteria around the biochar particles and provided a clear indication that biochar also shaped the composition of the microbial consortium. Based on the application of a suite of physico-chemical and electrochemical characterization techniques, we demonstrated that the positive effect of biochar is directly related to the electron-donating capacity (EDC) of the material, but is independent of its bulk electrical conductivity and specific surface area. The latter properties were all previously hypothesized to play a major role in the biochar-mediated interspecies electron transfer process in methanogenic consortia.ConclusionsCollectively, these results of this study suggest that for biochar addition in anaerobic digester operation, the screening and identification of the most suitable biochar material should be based on EDC determination, via simple electrochemical tests.Electronic supplementary materialThe online version of this article (10.1186/s13068-017-0994-7) contains supplementary material, which is available to authorized users.

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Section: Resultsmentioning

confidence: 99%

Enhancing methane production from food waste fermentate using biochar: the added value of electrochemical testing in pre-selecting the most effective type of biochar

Viggi

Simonetti

Palma

et al. 2017

Biotechnol Biofuels

135

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“…In addition, the biochar used in many studies is poorly characterized. Despite particle size having recently been put forward as having an influence on the physicochemical properties of biochar (Zhou et al, 2017; He et al, 2018), and the determination of CH 4 production and rumen fermentation (McFarlane et al, 2017), it is impossible to draw comparisons between previous studies as this information has not been included. Even our study has no comparable counterpart published at this time, as an in vitro RUSITEC study utilizing a novel biochar incorporating minerals bentonite and zeolite.…”

Section: Discussionmentioning

confidence: 99%

Effects of Hardwood Biochar on Methane Production, Fermentation Characteristics, and the Rumen Microbiota Using Rumen Simulation

et al. 2019

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Biochar is a novel carbonized feed additive sourced from pyrolyzed biomass. This compound is known to adsorb gasses and carbon, participate in biological redox reactions and provide habitat biofilms for desirable microbiota proliferation. Therefore, biochar holds potential to modify rumen fermentation characteristics and reduce enteric CH 4 emissions. The objective of this study was to investigate the effect of hardwood biochar supplementation on fermentation parameters, methane (CH 4 ) production and the ruminal archaeal, bacterial, and fungal microbiota using the in vitro RUSITEC (rumen simulation technique) system. Treatments consisted of a control diet (oaten pasture: maize silage: concentrate, 35:35:30 w/w) and hardwood biochar included at 400 or 800 mg per day (3.6 and 7.2% of substrate DM, respectively), over a 15-day period. Biochar supplementation had no effect ( P ≥ 0.37) on pH, effluent (mL/d), total gas (mL/d), dry matter (DM) digestibility or CH 4 production (mg/d). The addition of 800 mg biochar per day had the tendency ( P = 0.10) to lower the % of CH 4 released in fermentation compared to 400 mg/d biochar treatment. However, no effect ( P ≥ 0.44) was seen on total VFA, acetate, propionate, butyric, branched-chain VFA, valerate and caproate production and the ratio of acetate to propionate. No effect ( P > 0.05) was observed on bacterial, archaeal or fungal community structure. However, biochar supplementation at 800 mg/d decreased the abundance of one Methanomethylophilaceae OTU (19.8-fold, P = 0.046) and one Lactobacillus spp. OTU (31.7-fold, P < 0.01), in comparison to control treatments. Two fungal OTUs classified as Vishniacozyma victoriae (5.4 × 10 7 increase) and Sporobolomyces ruberrimus (5.4 × 10 7 -fold increase) were more abundant in the 800 mg/d biochar samples. In conclusion, hardwood biochar had no effects on ruminal fermentation characteristics and may potentially lower the concentration of enteric CH 4 when included at higher dosages by manipulating ruminal microbiota abundances.

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“…Magnetite, green rust, goethite, lepidocrocite, siderite, and vivianite are the dominant secondary minerals precipitated during microbial reduction of Fe(III)-(oxyhydr)oxides. ,, The composition of precipitated secondary minerals depends on the rate of Fe 2+ production and coexisting ligand. , Hence, the mineralogical compositions of the solid phase products on 7, 20, and 56 days during microbial reduction of As(III)-FH, As(V)-FH, and FH (Figure , and Figure S6, SI) were examined. The nature of the formed secondary minerals at different time intervals was independent of the type of starting minerals, i.e., As(III)-FH, As(V)-FH, and FH.…”

Section: Resultsmentioning

confidence: 99%

Fate of As(III) and As(V) during Microbial Reduction of Arsenic-Bearing Ferrihydrite Facilitated by Activated Carbon

Fang

Wang

et al. 2018

ACS Earth Space Chem.

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Microbial reduction of arsenic (As)-bearing Fe(III)-(oxyhydr)oxides is one of the major processes for the release of As in various environmental settings such as acid mine drainage, groundwater, and flooded paddy soil. Pyrogenic carbon has recently been reported to facilitate microbial extracellular reduction of Fe(III)-(oxyhydr)oxides. The aim of this study was to investigate the important hot topic regarding the fate and transformation of As during activated carbon (AC) facilitated microbial reduction of Asbearing ferrihydrite. Our results show that the rate and extent of Fe(III) reduction in Asbearing ferrihydrite by Shewanella oneidensis MR-1 were accelerated by AC. The AC facilitated reduction caused the release of As(III) into the solution, whereas it caused the preferential immobilization of As(V) on the solid phase. Furthermore, AC accelerated the precipitation of vivianite and siderite in sequence during microbial reduction processes. Both of the formed vivianite and siderite had an insignificant capacity for capturing As(III); however, As(V) was selectively immobilized by vivianite compared to that of siderite. Taken together, our findings provide crucial insights into understanding the role of AC on the redox and immobilization of Fe and As in suboxic and anoxic environments and thus their environmental fate when pyrogenic carbons are employed for agronomic and environmental applications.

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Biochar Addition Increases the Rates of Dissimilatory Iron Reduction and Methanogenesis in Ferrihydrite Enrichments

Cited by 31 publications

References 73 publications

Enhancing methane production from food waste fermentate using biochar: the added value of electrochemical testing in pre-selecting the most effective type of biochar

Enhancing methane production from food waste fermentate using biochar: the added value of electrochemical testing in pre-selecting the most effective type of biochar

Effects of Hardwood Biochar on Methane Production, Fermentation Characteristics, and the Rumen Microbiota Using Rumen Simulation

Fate of As(III) and As(V) during Microbial Reduction of Arsenic-Bearing Ferrihydrite Facilitated by Activated Carbon

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