Ecotoxicology and Environmental Safety,
Journal Year:
2023,
Volume and Issue:
268, P. 115691 - 115691
Published: Nov. 17, 2023
The
slow
rate
of
electron
transfer
and
the
large
consumption
carbon
sources
are
technical
bottlenecks
in
biological
treatment
wastewater.
Here,
we
first
proposed
to
domesticate
aerobic
denitrifying
bacteria
(ADB)
from
heterotrophic
autotrophic
by
electricity
(0.6
V)
under
zero
organic
source
conditions,
accelerate
shorten
hydraulic
retention
time
(HRT)
while
increasing
biodegradation
rate.
Then
investigated
extracellular
(EET)
mechanism
mediated
this
process,
additionally
examined
integrated
nitrogen
removal
efficiency
system
with
composite
pollution.
It
was
demonstrated
that
compared
traditional
membrane
bioreactor
(MBR),
BEC
displayed
higher
efficiency.
Especially
at
C/N
=
0,
exhibited
a
NO3--N
95.42
±
2.71
%
for
4
h,
which
about
6.5
times
than
MBR.
Under
compound
pollution
condition,
still
maintained
high
tetracycline
(94.52
2.01
91.50
0.001
%),
greatly
superior
MBR
(10.64
12.00
0.019
%).
In
addition,
in-situ
electrochemical
tests
showed
nitrate
could
be
directly
converted
N2
reduction
using
electrons
cathode,
successfully
as
terminal
acceptor.
