Finding out about the Canada’s first algal biorefinery project – ACC demonstration plant
New Year, new dreams, new projects… We begin
2017 with several posts about CO2 conversion technologies. Today, in
the first one of them, an overview on the Canada’s first algal biorefinery
demonstration project is provided. It includes an interesting interview with one
of the responsible for the success of this engaging project. Let us start by
knowing more about the background.
Background
The Government of Canada is supporting clean
energy research and development at all stages of the innovation spectrum. In
particular, it is boosting later stage technology demonstrations to help speed
the commercialization and adoption of cleaner techniques and methods. In this
sense, in 2013, the National Research Council of Canada (NRC), Canadian Natural
Resources Limited (CNRL) and Pond Technologies announced a multi-million dollar
investment to build and operate a demonstration-scale algal biorefinery
facility in Alberta.
While the project’s initial engineering phase
was completed, the deployment strategy was restructured due to the partners’
evolving business needs. CNRL became an observer and St Marys Cement entered into
the partnership. Thus, in 2015, NRC, Pond Technologies and St Marys Cement
finalized the details to implement an algal biorefinery at a St Marys Cement
plant in Ontario. This Algal Carbon Conversion (ACC) demonstration facility would
recycle CO2 emissions emanating from the plant’s operations by
incorporating them into algal biomass.
Current status
Now, the collaborative effort is bearing fruit
and the ACC demonstration facility is running. A 25,000 L photobioreactor within the plant is recycling carbon
dioxide and other airborne industrial pollutants into algal biomass that can be
further converted into sustainable products, including renewable fuels and
biomaterials. The launch of this first algal biorefinery is an example of the
commitment of the Canadian Government to accelerate clean energy innovation in the
country. More details about the technologies involved and the future
perspectives can be found in the interview below.
Figure 1. Photograph taken during the ACC Algal
Biorefinery Showcase - November 3, 2016 (courtesy of NRC)
The partners and their
involvement
NRC is the Government of
Canada's premier research and technology organization (RTO). They provide
innovation support, strategic research, and scientific and technical services. NRC’s
Algal
Carbon Conversion (ACC) flagship program is helping to convert carbon
dioxide emissions into usable algal biomass, renewable fuels and other
value-added bioproducts through integrated algal biorefineries. In this
project, NRC contributes its extensive expertise in microalgae biology,
cultivation and bioprocessing, as well as provide selected algae strains to the
project and on-site resources to manage and operate the demonstration biorefinery.
Pond
Technologies, founded in Toronto (Canada) on May 2007, is a nutrition and
carbon capture company. Their mission is to use microalgae to solve some of the
largest problems facing the world today. It has developed a universal algae
platform that provides optimal growth conditions for virtually any algae
strain. Using a variety of CO2 feedstocks, Pond has developed
proprietary photobioreactors and control systems that enable production of
revenue-generating algae products. For pollution abatement, Pond absorbs the CO2
contained in the emissions of major industrial facilities to grow algae for
biofuels, bioplastics and land reclamation. For nutraceutical products, Pond
uses beverage grade CO2 to grow algae for high-value food additives.
In this project, it has supplied the photobioreactor and supporting structures,
equipment and personnel.
St Marys
Cement is a leading provider of cementitious materials to customers in the
Great Lakes region. Since 1912, St Marys Cement has contributed to the growth
and prosperity of the region, providing material for infrastructure improvements
and new construction. Today, St Marys Cement is part of Votorantim Cimentos, one of the
largest building materials providers in the world. The demonstration
biorefinery is located at St Marys Cement plant in Ontario and fed with the CO2
emissions emanating from the plant’s operations.
Interview with Dr.
Stephen O’Leary
Lastly, an interview with Dr. Stephen O’Leary,
Director of the National Research Council of Canada’s Algal Carbon Conversion
Flagship Program (Aquatic and Crop Resource Development). He answers in detail to
questions about the characteristics, technologies and short future of the algal
biorefinery.
Acknowledgments:
I would like to express my appreciation to Stephen and Meagan Sylvester (Media
and Public Relations Officer, Communications Branch, NRC) for their kind
collaboration in the preparation of this post.
[BioRefineries Blog] The ACC algal biorefinery
recycles CO2 emissions emanating from the St Marys Cement plant in
Ontario. It is necessary some kind of pretreatment of the gas flow before
feeding the algae? What is the demo plant capacity in terms of captured CO2?
[Stephen O’Leary] No, we don’t pretreat the gas
before we introduce it into the photobioreactor. We do bring the temperature of
the gas down to 40 degrees C or less and remove excess moisture through a
condensation trap, but we do not “scrub” the component gasses. We monitor CO2, O2, NO,
NO2, and SO2 concentrations in the gas as it comes into
the PBR from the kiln. We similarly monitor the gas that exits from the PBR. Our
target is for the 25,000 L PBR to produce 25 kg of dry weight algae each day,
representing ~ 45 kg of CO2 removed daily by photosynthesis. This is
a pre-commercial demonstration scale.
[BRB] The core of the facility is a 25,000 L
photobioreactor (PBR). Could you briefly explain how it works? What kind of
algae is cultivated in the PBR?
[SOL] From the outside, the PBR looks like a
large steel box that is 5 m tall, 2.5 m wide and 2 m deep. On one face of the
PBR are pipes and hoses through which gasses and liquids are pumped in and out.
On the opposite face, a series of high intensity LED lights are mounted, they
are evenly spaced up and down and side to side, facing into the tank. Within
the tank, there are tubular light guides that direct the light from the LEDs
and disperse it completely throughout the volume of the algae culture within
the tank. The LEDs and light guides, as well as the tank itself, were designed
and built by our partner Pond Technologies. The algae is cultivated within the
PBR through the addition of water, nutrients, light (from the LEDs) and CO2
from the cement kiln gas. The gas is introduced at the bottom of the PBR and
bubbles upwards keeping the algae culture well mixed.
Within the 25,000 L PBR we are cultivating
strains of microalgae that NRC scientists have collected from waterbodies
within a 50 km radius of the pilot plant – to ensure they are native to the
region. We have isolated, identified and preselected strains for positive
growth characteristics and tolerance to flue gasses at NRC’s Marine Research
Station in Ketch Harbour (Nova Scotia, Canada). So far, we have been primarily
cultivating novel strains of Chlorella and Scenedesmus at the pilot plant in St
Marys.
[BRB] What are the technologies involved in the
harvesting and dewatering stages?
[SOL] We are currently using conventional “off
the shelf” centrifuge and heat drier technologies to harvest and dewater the
algae. In the new year (referring to 2017) we will be testing novel
technologies being developed by NRC engineers that make use of electrical
fields and new cellular disruption technologies to harvest cells more
efficiently in terms of cost and energy required, and to process the biomass
when it is concentrated but still wet (suspended in liquid). I can’t say more
about these new technologies at this time.
[BRB] What is the concept of biorefinery used
to valorize the algal biomass? In other words, what are the processes utilized
and the final bioproducts (biofuels, bioplastics…) obtained?
[SOL] The final products for any particular
algal carbon conversion plant will depend on the needs of the host industry
(the greenhouse gas emitter that the plant is connected to) and the local
markets they can sell into. Within NRC, we have a number of current R&D
projects exploring the feasibility and opportunity to convert algae biomass
into a variety of marketable products including: biofuels (biodiesel,
bio-methane, HTL oil), soil amendment products, bioplastics, platform chemicals
and animal feeds (in some specific cases).
[BRB] How long will the tests last? What are
the data that are being monitored?
[SOL] The ACC pilot plant at St Marys Cement is
entering into routine operation and testing now. We expect to be collecting
data from this demonstration site for the next 8 – 12 months. We will be monitoring
algae growth rate, yield and CO2 consumption, as well as power
consumption and cost to operate the algae cultivation and harvesting equipment.
Downstream, we are also collecting data on the possible commercial uses of the
biomass produced through conversion to biofuels, bioplastics, etc.
[BRB] About the near future, it is expected to
scale-up the facility and/or deploy the same model in other cement plants? What
are the following steps?
[SOL] The current 25,000 L PBR is a
pre-commercial unit. Within a year we hope to begin to work with Pond
Technologies on the deployment of a commercial scale unit, likely to be closer
to 1,000,000 L in volume. This unit may be deployed at a cement factory or a
municipal power generating station, but really it could go anywhere where there
is an appropriate flue stack available. We have also partnered with Pond
Technologies, the City of Markham and Markham District Energy in the Carbon
XPRIZE competition which may see us deploy this technology at a natural gas
power plant test facility in Alberta (Canada) in 2018-2019 (more information
about the Carbon XPrize competition here).
[BRB] Could you share your thoughts about the
vision of the ACC Flagship Program and its impact in the Canadian bioeconomy?
[SOL] The vision of the ACC Flagship Program is for
NRC to work with Canadian industry to address the issue of CO2
emissions while simultaneously generating economically and
environmentally-sustainable opportunities for Canadian companies. The ACC
Flagship program strives to position Canada as a world leader in converting
carbon dioxide emissions into algal biomass, renewable biofuels, sustainable
biomaterials and other value-added products through algal biorefineries integrated
with Canadian industries. We expect Canada to become a world-leading developer
and exporter of environmental technologies, including ACC technologies, that
will both reduce the environmental footprint of conventional carbon emitting
industries while simultaneously creating a new source of sustainable
bioproducts with their own economic value.