Application of iron oxide (Fe3O4) nanoparticles during the two-stage anaerobic digestion with waste sludge: Impact on the biogas production and the substrate metabolism
메타 데이터
바이오화학분류
바이오정밀화학
연료
논문
Application of iron oxide (Fe3O4) nanoparticles during the two-stage anaerobic digestion with waste sludge: Impact on the biogas production and the substrate metabolism
<P><B>Abstract</B></P> <P>Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles (FNP) were implemented in two-stage anaerobic digestion to enhance the biogas production and waste sludge reduction in this study. The degradation and transformation of extracellular polymeric substances (EPS) and dissolved organic matters (DOM) under optimal FNP concentration during two-stage anaerobic process with heat pretreated waste sludge was investigated by analyzing the changes of soluble chemical oxygen demand (SCOD), carbohydrate and protein in EPS and DOM. FNP addition significantly enhanced volatile fatty acids (VFAs) production. The optimal dosage of FNP was 100 mg/L yielded 11.9 ml H<SUB>2</SUB>/g VS hydrogen and 109.8 ml CH<SUB>4</SUB>/g VS methane, which increased by 15.1% of hydrogen yield and 58.7% of methane yield compared with that of control. The maximum volatile suspended solids (VS) reduction was 46.9% with the addition of 100 mg/L FNP compared with that of control (34.3%). NH<SUB>4</SUB> <SUP>+</SUP>-N production was inhibited with 20, 50, and 100 mg/L FNP addition comparing with control.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles additives enhanced biogas production and sludge reduction. </LI> <LI> VFAs enhanced by 2.5 times with 100 mg/L FNP addition in acidogenesis phase. </LI> <LI> The optimal dosage of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles was 100 mg/L. </LI> <LI> Substrate metabolism of two-stage anaerobic digestion was analyzed. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>