TY - JOUR
T1 - Application of a CO2-stripping system for calcium removal to upgrade organic matter removal and sludge granulation in a leachate-fed EGSB bioreactor
AU - Lu, Xueqin
AU - Chen, Shanping
AU - Luo, Jinghuan
AU - Qian, Guangren
AU - Liu, Jianyong
AU - Zhen, Guangyin
AU - Li, Yu You
N1 - Funding Information:
This work was financially supported by the National Natural Science Foundation of China (21377079, 51578329), the key research project from the Science and Technology Commission of Shanghai Municipality (13DZ0511600) and the Program for Innovative Research Team in University (No. IRT13078).
Publisher Copyright:
© The Royal Society of Chemistry 2016.
PY - 2016
Y1 - 2016
N2 - The application of CO2-stripping system for calcium removal to upgrade organic matter removal and sludge granulation in a leachate-fed EGSB bioreactor was evaluated. Three-dimensional excitation-emission matrix (3D-EEM) spectroscopy combined with parallel factor (PARAFAC) analysis was used to characterize the transformation of the effluent dissolved organic matter (DOM) during the operation. X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) and scanning electronic microscopy (SEM) were used to assess the effects of a CO2-stripping unit on the microstructure of the granules. The introduction of the CO2-stripping system reduced the calcium concentration while upgrading methane evolution. The methane yield reached 0.33 L CH4 per g CODremoved in the bioreactor with the CO2-stripping unit compared with 0.31 L CH4 per g CODremoved without the unit as the control. The combined system produced 80% and 50-60% chemical oxygen demand (COD) and total nitrogen (TN) removal under steady-state conditions, which were 6.3% and 41.0% higher than those of the control, respectively. With 3D-EEM-PARAFAC analysis, three fluorescence components, associated as tryptophan protein-like (component 1, Ex/Em = 275-280/355-365 nm) and humic-like substances (component 2, Ex/Em = 240(295, 340)/450 nm and component 3, Ex/Em = 320/320 nm), were identified from the effluent samples. The componential characterizations confirmed the favorable influence of the CO2-stripping unit on the transformation of DOM. Further analysis through XRD, FT-IR and SEM demonstrated that the use of the unit alleviated inactivation of the granules through removing calcium, which might be the core reason for the enhancement of the EGSB performance.
AB - The application of CO2-stripping system for calcium removal to upgrade organic matter removal and sludge granulation in a leachate-fed EGSB bioreactor was evaluated. Three-dimensional excitation-emission matrix (3D-EEM) spectroscopy combined with parallel factor (PARAFAC) analysis was used to characterize the transformation of the effluent dissolved organic matter (DOM) during the operation. X-ray diffraction (XRD), Fourier-transform infrared (FT-IR) and scanning electronic microscopy (SEM) were used to assess the effects of a CO2-stripping unit on the microstructure of the granules. The introduction of the CO2-stripping system reduced the calcium concentration while upgrading methane evolution. The methane yield reached 0.33 L CH4 per g CODremoved in the bioreactor with the CO2-stripping unit compared with 0.31 L CH4 per g CODremoved without the unit as the control. The combined system produced 80% and 50-60% chemical oxygen demand (COD) and total nitrogen (TN) removal under steady-state conditions, which were 6.3% and 41.0% higher than those of the control, respectively. With 3D-EEM-PARAFAC analysis, three fluorescence components, associated as tryptophan protein-like (component 1, Ex/Em = 275-280/355-365 nm) and humic-like substances (component 2, Ex/Em = 240(295, 340)/450 nm and component 3, Ex/Em = 320/320 nm), were identified from the effluent samples. The componential characterizations confirmed the favorable influence of the CO2-stripping unit on the transformation of DOM. Further analysis through XRD, FT-IR and SEM demonstrated that the use of the unit alleviated inactivation of the granules through removing calcium, which might be the core reason for the enhancement of the EGSB performance.
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U2 - 10.1039/c5ra26444h
DO - 10.1039/c5ra26444h
M3 - Article
AN - SCOPUS:84961386050
SN - 2046-2069
VL - 6
SP - 9286
EP - 9296
JO - RSC Advances
JF - RSC Advances
IS - 11
ER -