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Methanogenesis from wastewater stimulated by addition of elemental manganese.

Qiao S, Tian T, Qi B, Zhou J - Sci Rep (2015)

Bottom Line: The results indicated that elemental manganese effectively enhanced both the methane yield and the production rate.Besides, more acetate consumption and less propionate generation were observed during the methanogenesis with manganese.Further studies demonstrated that the elemental manganese served as electron donors for the methanogenesis from carbon dioxide, and the final proportion of methane in the total generated gas with 4 g/L manganese addition reached 96.9%, which was 2.1-fold than that of the control (46.6%).

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P.R. China.

ABSTRACT
This study presents a novel procedure for accelerating methanogenesis from wastewater by adding elemental manganese into the anaerobic digestion system. The results indicated that elemental manganese effectively enhanced both the methane yield and the production rate. Compared to the control test without elemental manganese, the total methane yield and production rate with 4 g/L manganese addition increased 3.4-fold (from 0.89 ± 0.03 to 2.99 ± 0.37 M/gVSS within 120 h) and 4.4-fold (from 6.2 ± 0.1 to 27.2 ± 2.2 mM/gVSS/h), respectively. Besides, more acetate consumption and less propionate generation were observed during the methanogenesis with manganese. Further studies demonstrated that the elemental manganese served as electron donors for the methanogenesis from carbon dioxide, and the final proportion of methane in the total generated gas with 4 g/L manganese addition reached 96.9%, which was 2.1-fold than that of the control (46.6%).

No MeSH data available.


SEM images of (a) initial manganese power, (b,c) final manganese power, (d) ball-like MnOx, (e) rod-like MnOx, (f) flower-like MnOx.
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f3: SEM images of (a) initial manganese power, (b,c) final manganese power, (d) ball-like MnOx, (e) rod-like MnOx, (f) flower-like MnOx.

Mentions: Scanning electron microscopy (SEM) analysis was conducted using a FEI Company’s Quanta 450 field emission scanning electron microscope to verify the possible generated manganese oxides based on such hypothesis. Figure 3 showed the SEM observation of the manganese powder and the generated manganese oxides. The surface of the initial added manganese power were flat with sharp edges (Fig. 3a), while after 120 h of anaerobic reaction, the surface turned to be rough with a layer of manganese oxides distribution (Fig. 3b,c). It should also be noted that the generated manganese oxides possessed a variety of structure. Figure 3d showed a kind of ball-like manganese oxides with an average diameter about 3 μm and Fig. 3e depicted a kind of rod-like manganese oxide with an average length about 5 μm. Both of these two kinds of manganese oxides were common in the manganese oxidation process25. Interestingly, this study obtained a kind of flower-like manganese oxides (Fig. 3f), which was recognized to be a new type of biogenic manganese oxides.


Methanogenesis from wastewater stimulated by addition of elemental manganese.

Qiao S, Tian T, Qi B, Zhou J - Sci Rep (2015)

SEM images of (a) initial manganese power, (b,c) final manganese power, (d) ball-like MnOx, (e) rod-like MnOx, (f) flower-like MnOx.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4525485&req=5

f3: SEM images of (a) initial manganese power, (b,c) final manganese power, (d) ball-like MnOx, (e) rod-like MnOx, (f) flower-like MnOx.
Mentions: Scanning electron microscopy (SEM) analysis was conducted using a FEI Company’s Quanta 450 field emission scanning electron microscope to verify the possible generated manganese oxides based on such hypothesis. Figure 3 showed the SEM observation of the manganese powder and the generated manganese oxides. The surface of the initial added manganese power were flat with sharp edges (Fig. 3a), while after 120 h of anaerobic reaction, the surface turned to be rough with a layer of manganese oxides distribution (Fig. 3b,c). It should also be noted that the generated manganese oxides possessed a variety of structure. Figure 3d showed a kind of ball-like manganese oxides with an average diameter about 3 μm and Fig. 3e depicted a kind of rod-like manganese oxide with an average length about 5 μm. Both of these two kinds of manganese oxides were common in the manganese oxidation process25. Interestingly, this study obtained a kind of flower-like manganese oxides (Fig. 3f), which was recognized to be a new type of biogenic manganese oxides.

Bottom Line: The results indicated that elemental manganese effectively enhanced both the methane yield and the production rate.Besides, more acetate consumption and less propionate generation were observed during the methanogenesis with manganese.Further studies demonstrated that the elemental manganese served as electron donors for the methanogenesis from carbon dioxide, and the final proportion of methane in the total generated gas with 4 g/L manganese addition reached 96.9%, which was 2.1-fold than that of the control (46.6%).

View Article: PubMed Central - PubMed

Affiliation: Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education, China), School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, P.R. China.

ABSTRACT
This study presents a novel procedure for accelerating methanogenesis from wastewater by adding elemental manganese into the anaerobic digestion system. The results indicated that elemental manganese effectively enhanced both the methane yield and the production rate. Compared to the control test without elemental manganese, the total methane yield and production rate with 4 g/L manganese addition increased 3.4-fold (from 0.89 ± 0.03 to 2.99 ± 0.37 M/gVSS within 120 h) and 4.4-fold (from 6.2 ± 0.1 to 27.2 ± 2.2 mM/gVSS/h), respectively. Besides, more acetate consumption and less propionate generation were observed during the methanogenesis with manganese. Further studies demonstrated that the elemental manganese served as electron donors for the methanogenesis from carbon dioxide, and the final proportion of methane in the total generated gas with 4 g/L manganese addition reached 96.9%, which was 2.1-fold than that of the control (46.6%).

No MeSH data available.