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MICRODYN BIO-CEL XS-1 Pilot Plant Manual // Revision: A // Date: Jul. 25, 2018
After the denitrification follows the filtration. To start this phase, there is a pre-aeration cycle to
get the sludge mixed. The pre-aeration also serves as an initial cleaning of the membrane
surface. The duration of the pre-aeration is adjustable.
Next comes the filtration, which consist of 4 steps (filtration, relaxation 1, back washing and
relaxation 2), as mentionend previously. During filtration the level inside the filtration tank will go
down. Filtration will continue until the level hits the min level. Once this happens the operation
sequence starts anew with the filling sequence.
The operation sequence as well as the recommended settings are descibed in Table 4: Overview
of operation settings.
Table 4 : Overview of operation settings
Operation step Description Settings Recommended
Filling of the
aeration tank (FILL) Feed pump starts at L
min
and
stopps at L
max
Blower off
L
MIN
= 150
– 160 cm
L
MAX
= 165
– 175 cm
L
MIN
= 155 cm
L
MAX
= 170 cm
Denitrification (DN)
Denitrification with intermittent
aeration for sludge mixing T
DN
= 0 - 99 min T
DN
= 30 min
Intervall between the aeration
times
Blower off
T
DN,DELAY
= 0-99 min T
DN,DELAY
= 10
min
Aeration for sludge mixing
Blower on
T
DN,MIX
= 0-99 sec T
DN,MIX
= 10 sec
Filtration (FN)
Pre-aeration to make sure the
sludge is well aerated and
mixed
Blower on
T
PRE
= 0-99 min T
PRE
= 10 min
Filtration, Permeate pump is
running
Blower on
T
FILT
= 0-999 sec
Q
FILT
= 80-250 L/h
T
FILT
= 510 sec
Q
FILT
= 130 L/h
Relax 1
Back wash (Permeate pump
running in reverse)
Relax 2
Blower on
T
R1
= 0-999 sec
T
BW
= 0-999 sec
Q
BW
= 80
– 500 L/h
T
R2
= 0-999 sec
T
R1
= 50 sec
T
BW
= 30 sec
Q
BW
= 130 L/h
T
R2
= 10 sec
There are start and stop ramps for the permeate pump to avoid sudden pressure shocks in the
system. These rams are pre-set and cannot be changed. The ramping time is set to T
RAMP
= 5
sec. The up ramp is always part of the pump interval, the down ramp is part of the following
interval.
Example: The permeate pump is set to run for 510 sec., followed by 50 sec. relaxation. The actual
runtime will be 5 sec. ramping up, 505 sec. running at target flow, 5 sec. ramping down followed
by 45 sec. relaxation.
Figure 6 to 11 show the control panel graphics to navigate trough the PLC settings.