BioChem - DOS

Influence of low voltage electric field stimulation on hydrogen generation from anaerobic digestion of waste activated sludge

The Science of the total environment

Tao, Ziletao; Wang, Dongbo; Yao, Fubing; Huang, Xiaoding; Wu, You; Wu, Yanxin; Chen, Zhuo; Wei, Jing; Li, Xiaoming; Yang, Qi

<P><B>Abstract</B></P> <P>Low voltage electric field is an important stimulation condition for biochemical metabolic of microorganism. But few literatures were available related to the effect of low voltage electric field on hydrogen production from anaerobic digestion of waste activated sludge (WAS). This study aims to explore such influencing thus carried a series experiments under 35 &plusmn; 1 &deg;C and pH 7.0 &plusmn; 0.2. The experimental results showed that the hydrogen production increased from 28.1 to 32.5 mL/g VSS with electric field strengthening from 0 to 40 V/m. The mechanism explorations revealed that the yield of volatile fatty acids (VFAs) yield could reach 1.16-fold of control group when the highest-level electric field (40 V/m) forced in the anaerobic fermentation system with dextran as model substrate. Further analysis of relative activities of functional enzymes, such as NADH, acetate kinase, butyrate kinase and OAATC, showed that it was promoted by electric field stimulation as 2.09, 1.52, 1.28 and 1.16-fold of the control test, respectively. Meanwhile, the conductivity of fermentation liquor in presence of low voltage electric field stimulation increased 83% compared with the control group. This work verified the promotion of low voltage electric field stimulation on hydrogen production from anaerobic digestion of WAS and might provide a new sight for the green energy generation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low voltage electric field stimulated VFA generation from sludge digestion system. </LI> <LI> Low voltage electric field enhanced hydrogen production from anaerobic digestion. </LI> <LI> Low voltage electric field influenced each stage of anaerobic digestion system. </LI> <LI> Low voltage electric field improved relative activities of functional enzymes. </LI> <LI> Low voltage electric field disturbed cell membrane permeability. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

2020

Elsevier

0048-9697

1879-1026

704

pp.135849

10.1016/j.scitotenv.2019.135849

http://click.ndsl.kr/servlet/OpenAPIDetailView?keyValue=05787966&target=NART&cn=NART98538896

Electric field; Anaerobic fermentation; Hydrogen generation; Volatile fatty acids; Key enzyme; Membrane permeability