2.2. Dewatering
The algal concentration after growth in the open raceway pond
requires water removal before the biomass can be further processed.
In the experimental system excess water was removed
using a membrane filtration system which increased the algal
concentration from the harvest density of 1.5 g L1 to 40 g L1. A
centrifuge was then used to increase the algal concentration to
220 g L1. This concentration is adequate for bio-oil recovery
through HTL, but further water must be removed for bio-oil recovery
through pyrolysis. In the small-scale experimental system this
was done through lyophilizing. Microalgae mass losses in the
dewatering sub-process for the experimental system was modeled
at 15%
Industrial-scale system modeling of the dewater system was
based on the use of a preliminary bio-flocculation system, used
to increase the algal concentration from 0.5 g L1 to 10 g L1, followed
by dissolved air flotation, to increase algal concentration
to 15 g L1 and finally a centrifuge for a final concentration of
240 g L1 [34,49]. The centrifuge energy requirements and performance
is based on an Evodos type 10 centrifuge [65]. A final concentration
of approximately 20% solids is adequate for bio-oil
recovery of microalgae to bio-oil through HTL. For pyrolysis further
dewatering was achieved with a rotary drum, which is detailed in
the pyrolysis sub process section. Microalgae mass losses through
the dewatering process from bio flocculation through centrifugation
are approximately 11%
2.2. Dewatering
The algal concentration after growth in the open raceway pond
requires water removal before the biomass can be further processed.
In the experimental system excess water was removed
using a membrane filtration system which increased the algal
concentration from the harvest density of 1.5 g L1 to 40 g L1. A
centrifuge was then used to increase the algal concentration to
220 g L1. This concentration is adequate for bio-oil recovery
through HTL, but further water must be removed for bio-oil recovery
through pyrolysis. In the small-scale experimental system this
was done through lyophilizing. Microalgae mass losses in the
dewatering sub-process for the experimental system was modeled
at 15%
Industrial-scale system modeling of the dewater system was
based on the use of a preliminary bio-flocculation system, used
to increase the algal concentration from 0.5 g L1 to 10 g L1, followed
by dissolved air flotation, to increase algal concentration
to 15 g L1 and finally a centrifuge for a final concentration of
240 g L1 [34,49]. The centrifuge energy requirements and performance
is based on an Evodos type 10 centrifuge [65]. A final concentration
of approximately 20% solids is adequate for bio-oil
recovery of microalgae to bio-oil through HTL. For pyrolysis further
dewatering was achieved with a rotary drum, which is detailed in
the pyrolysis sub process section. Microalgae mass losses through
the dewatering process from bio flocculation through centrifugation
are approximately 11%
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