TY - JOUR
T1 - Enhanced anaerobic digestibility of waste activated sludge by plant-derived biosurfactant
AU - Zhou, Aijuan
AU - Luo, Haichao
AU - Varrone, Cristiano
AU - Wang, Youzhao
AU - Liu, Wenzong
AU - Wang, Aijie
AU - Yue, Xiuping
PY - 2015/3/14
Y1 - 2015/3/14
N2 - To improve anaerobic digestibility of waste activated sludge (WAS), a novel treatment was explored by a plant-derived biosurfactant (saponin biosurfactant (SB)). SB showed positive effects on WAS hydrolysis and acidogenesis with increasing concentration, but was insignificant at dosage >0.20 g SB/g total suspended solids (TSS). Soluble protein and carbohydrate concentrations reached 2029 ± 28 and 343 ± 52 mg chemical oxygen demand (COD)/L (0.20 g SB/g TSS, 48 h), which were 4.77-fold and 5.87-fold higher than that without treatment. Volatile fatty acids (VFAs) bioproduction showed a 3.51-fold increase in 72 h. Moreover, acetic acid increased already after 2 h with SB treatment, but after 8 h in the control, indicating that SB accelerated syntrophic acetogenesis from butyric acid degradation to acetic acid. Additionally, methane production was enhanced at lower dosage (0.10 g SB/g TSS), with 63.0 and 20.3 mL/g volatile suspended solids (VSS), respectively, while it was 46.5 mL/g VSS in the control. The results obtained are in good agreement with previous ones obtained with chemosynthetic surfactants. Moreover, SB has advantages of easy production and sustainability of supply, which should promote the implementation for WAS treatment.
AB - To improve anaerobic digestibility of waste activated sludge (WAS), a novel treatment was explored by a plant-derived biosurfactant (saponin biosurfactant (SB)). SB showed positive effects on WAS hydrolysis and acidogenesis with increasing concentration, but was insignificant at dosage >0.20 g SB/g total suspended solids (TSS). Soluble protein and carbohydrate concentrations reached 2029 ± 28 and 343 ± 52 mg chemical oxygen demand (COD)/L (0.20 g SB/g TSS, 48 h), which were 4.77-fold and 5.87-fold higher than that without treatment. Volatile fatty acids (VFAs) bioproduction showed a 3.51-fold increase in 72 h. Moreover, acetic acid increased already after 2 h with SB treatment, but after 8 h in the control, indicating that SB accelerated syntrophic acetogenesis from butyric acid degradation to acetic acid. Additionally, methane production was enhanced at lower dosage (0.10 g SB/g TSS), with 63.0 and 20.3 mL/g volatile suspended solids (VSS), respectively, while it was 46.5 mL/g VSS in the control. The results obtained are in good agreement with previous ones obtained with chemosynthetic surfactants. Moreover, SB has advantages of easy production and sustainability of supply, which should promote the implementation for WAS treatment.
KW - Anaerobic digestibility
KW - Extracellular polymeric substances (EPS)
KW - Plant-derived biosurfactant
KW - Saponin
KW - Waste activated sludge (WAS)
UR - http://www.scopus.com/inward/record.url?scp=84937526301&partnerID=8YFLogxK
U2 - 10.1016/j.procbio.2015.04.023
DO - 10.1016/j.procbio.2015.04.023
M3 - Journal article
AN - SCOPUS:84937526301
SN - 1359-5113
VL - 50
SP - 1413
EP - 1421
JO - Process Biochemistry
JF - Process Biochemistry
IS - 9
ER -