TY - JOUR
T1 - Synergistic effect for efficient oxidization of refractory organics with high chroma by an innovative persulfate assisted microbial electrolysis ultraviolet cell
AU - Zou, Rusen
AU - Hasanzadeh, Aliyeh
AU - Khataee, Alireza
AU - Meng, Fangang
AU - Angelidaki, Irini
AU - Zhang, Yifeng
PY - 2021
Y1 - 2021
N2 - UV based advanced oxidation processes including the newly developed
microbial electrolysis ultraviolet cell (MEUC) are easy to operate, but
always exhibit an ineffective treatment of wastewater with high chroma
due to the low UV transmittance. Herein, an innovative
persulfate-assisted MEUC process (MEUPS) was developed to treat such
wastewaters. The MEUPS can achieve complete decolorization of the
selected model compound (40 mg L−1 of methylene blue, MB)
within 140 min and a mineralization degree of 97% within 5 h under
optimal operating conditions. The hybrid MEUPS process showed a much
better treatment performance than that of the individual process and the
synergy factor was quantified as 6.42. •SO4−, •OH, and •O2− were proved to be the major reactive radicals involved in MB degradation, and the degree of contribution was ranked as •SO4−, •OH, and •O2−.
Correspondingly, the working mechanism of the MEUPS process was
inferred, in which the boosted above listed major reactive radicals can
be attributed to the catalytic effect of bioelectrons and UV
irradiation, thus the synergistic effect on the efficient treatment of
MB-contaminated wastewater. Additionally, the treated effluent exhibited
non-toxic by using aquatic plant Lemna minor as an indicator.
This research provides a new perspective for the efficient and
cost-effective treatment of industrial wastewater with high chroma and
refractory organics over a broad pH range together with catalyst-free
conditions by using PS-assisted microbial photoelectrochemical
technologies.
AB - UV based advanced oxidation processes including the newly developed
microbial electrolysis ultraviolet cell (MEUC) are easy to operate, but
always exhibit an ineffective treatment of wastewater with high chroma
due to the low UV transmittance. Herein, an innovative
persulfate-assisted MEUC process (MEUPS) was developed to treat such
wastewaters. The MEUPS can achieve complete decolorization of the
selected model compound (40 mg L−1 of methylene blue, MB)
within 140 min and a mineralization degree of 97% within 5 h under
optimal operating conditions. The hybrid MEUPS process showed a much
better treatment performance than that of the individual process and the
synergy factor was quantified as 6.42. •SO4−, •OH, and •O2− were proved to be the major reactive radicals involved in MB degradation, and the degree of contribution was ranked as •SO4−, •OH, and •O2−.
Correspondingly, the working mechanism of the MEUPS process was
inferred, in which the boosted above listed major reactive radicals can
be attributed to the catalytic effect of bioelectrons and UV
irradiation, thus the synergistic effect on the efficient treatment of
MB-contaminated wastewater. Additionally, the treated effluent exhibited
non-toxic by using aquatic plant Lemna minor as an indicator.
This research provides a new perspective for the efficient and
cost-effective treatment of industrial wastewater with high chroma and
refractory organics over a broad pH range together with catalyst-free
conditions by using PS-assisted microbial photoelectrochemical
technologies.
KW - Microbial electrochemistry
KW - UV irradiation
KW - Persulfate activation
KW - Synergy
KW - Advanced oxidation processes
U2 - 10.1016/j.cej.2021.129477
DO - 10.1016/j.cej.2021.129477
M3 - Journal article
SN - 1385-8947
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
M1 - 129477
ER -