Developing large-scale
microbial electrolysis cells (MECs) for
treatment of sludge return liquors
Bioelectrochemical systems,
such as microbial electrolysis
cells (MECs),
are a novel technology which can promote a
circular economy by
yielding energy-rich hydrogen
from anaerobic treatment of wastewater. Most
research on these systems has
been conducted at lab-scale
using synthetic wastewaters with
a handful of pilot-scale
reactors operated with
real wastewaters at
Newcastle University which
have
provided a proof of concept for
hydrogen generation at ambient
temperatures. Three significant
barriers are impeding commercial
implementation of MECs: low
performance when treating real
wastewater (poor
hydrogen yields and energy
recovery), high variability
between identical
electrodes/reactors and high
material costs. Hence,
this project will aim to:
-
Develop practical sterilisation
techniques to
eliminate
hydrogen
scavengers and
improve hydrogen production.
-
Optimize input
voltage at
pilot-scale using
sludge return
liquor (a high
strength
by-product of dewatered digested
sludge).
-
Test and monitor
the performance
of cheaper
electrode
materials (e.g recycled
carbon fibre).
-
Explore reactor
design by
investigating
the influence of
channel width on
current density
and hydrogen
production using
an existing CFD
model.
-
Develop
strategies for
optimum biofilm
formation and
reducing
variability
using a high
number of
replica reactors
and microbial gene-sequencing
analysis to
identify
differences
between good and
bad performing
systems.