TY - JOUR
T1 - Calcium peroxide pretreatment of waste activated sludge for enhancement of short chain fatty acids extraction from fermentation liquid by layered double hydroxides
AU - Sheng, Liang
AU - Ma, Xiao
AU - Pan, Fanfeng
AU - Liu, Jianyong
AU - Li, Yu You
N1 - Funding Information:
This study was financially supported by the Science and Technology Commission of Shanghai Municipality ( 18230710900 and 16010500200 ) and the National Natural Science Foundation of China ( 51778352 and 51578329 ). Appendix A
Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/2/10
Y1 - 2020/2/10
N2 - In the present study, calcium peroxide (CaO2) pretreatment of waste activated sludge (WAS) was proposed to enhance the extraction efficiency of short chain fatty acids (SCFAs) from anaerobic fermentation liquid (AFL) via in situ synthesis of layered double hydroxides (LDHs). The experimental results showed that the SCFAs concentration in the AFL of the WAS with CaO2 pretreatment was significantly enhanced to 7471.7 mg chemical oxygen demand (COD)/L, which was much higher than that of the control (4982.0 mg COD/L). At the same time, phosphate and carbonate ions were simultaneously removed by calcium ions with removal rates of 85.3% and 90.8% compared with the control, respectively. With the help of a higher SCFAs concentration and the removal of interfering anions, the SCFAs content in the synthesized SCFAs-LDHs-CaO2 could be enhanced to 26.6 mg COD/g LDH, which was 39.3% higher than that of the control. The economic analysis for future applications revealed that the expense of using SCFAs-LDHs-CaO2 as an external carbon source was 0.9 Renminbi/m3, which resulted in a savings of approximately 57.0% compared with that of the SCFAs-LDHs-Control.
AB - In the present study, calcium peroxide (CaO2) pretreatment of waste activated sludge (WAS) was proposed to enhance the extraction efficiency of short chain fatty acids (SCFAs) from anaerobic fermentation liquid (AFL) via in situ synthesis of layered double hydroxides (LDHs). The experimental results showed that the SCFAs concentration in the AFL of the WAS with CaO2 pretreatment was significantly enhanced to 7471.7 mg chemical oxygen demand (COD)/L, which was much higher than that of the control (4982.0 mg COD/L). At the same time, phosphate and carbonate ions were simultaneously removed by calcium ions with removal rates of 85.3% and 90.8% compared with the control, respectively. With the help of a higher SCFAs concentration and the removal of interfering anions, the SCFAs content in the synthesized SCFAs-LDHs-CaO2 could be enhanced to 26.6 mg COD/g LDH, which was 39.3% higher than that of the control. The economic analysis for future applications revealed that the expense of using SCFAs-LDHs-CaO2 as an external carbon source was 0.9 Renminbi/m3, which resulted in a savings of approximately 57.0% compared with that of the SCFAs-LDHs-Control.
KW - Anaerobic fermentation liquid
KW - Calcium peroxide
KW - Layered double hydroxides
KW - Short chain fatty acids
KW - Waste activated sludge
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U2 - 10.1016/j.jclepro.2019.119067
DO - 10.1016/j.jclepro.2019.119067
M3 - Article
AN - SCOPUS:85075345904
SN - 0959-6526
VL - 246
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 119067
ER -
