Introduction the years from the environmentalists worldwide. From 1995

Introduction

On this
section there will be mentioned the aims and the objectives of the project and
the research that has been done in order to complete the study.

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Aims
odjectives

this study
is aiming to show the advantages and
disadvantages of current Carbon Capture and Storage technologies and their
effectiveness at reducing  the disaffects
of anthropogenic climate change.

The
objectives are to examine the Carbon Capture and Storage technologies, according
their positives and negatives. Also to identify the best way to record the anthropogenic climate change.

Background

Most of the environmental problems start during the industrial
revolution, since then they have been increased dramatically. In addition to that
during the last 200 years the human population have been growth rapidly
from  1 to 6.5 billion.

Before the Industrial
Revolution in the 19th century, global average CO2 was about 280 ppm. CO2 is one of the most
notorious greenhouses gases produced from human activity. The consetation of CO2  in the globe is increasing, that phenomenon has
been noted over the years from the environmentalists worldwide. From 1995 to
2001, average global CO2 emissions increased at a rate of 1.4% per year. While
this increase is slower than the increase in use of primary energy, it is
higher than the increase in CO2 emissions over the past 5 years.

There is sufficient evidence to
show that human activities have contributed significantly to the gradual
warming of the Earth over the past 50 years. According to the Australian
Greenhouse Gas Inventory, in 2006, 576.0 million tones CO2-equivalent (CO2e) were
released from human activities. Carbon dioxide was the most significant of
greenhouse gases in Australia’s inventory, making up 74.3% (427.8 million
tonnes) of total CO2  emissions.

Electric power generation is the greatest contributor to CO2 gas emissions , as
it produce approximately 50% of the total CO2 that are produced. Another
huge factor of CO2 emitions is the transport sector.

 

Moreover,
on December 2017, the average CO2 level at Mauna Loa, Hawaii, was at 406.75ppm, which
was 1.61ppm higher than the average for November 2016 5, although the biggest
ever increase over the period of a year was from 2015 to 2016. In addition, it
was very different from the CO2 levels at the period before the Industrial
Revolution. While some of the increase in CO2 levels can be attributed to the El
Niño phenomenon, a significant portion of it was due to activities of humans.

 Business-as-usual emission scenarios for
fossil fuel emissions suggest that atmospheric CO2 could peak
in 2,250 AD at ?2,000?p.p.m. CO2 values
as high as this were last seen in the Triassic around 220–200?Myrs. Some
studies claim that greenhouse gas emissions have decreased recently. Although those
studies have consider only the emissions for the generation of energy according
to the estimations that each country made. Changes in land use, including the
effects of deforestation and the loss of land have not considered.

 

The words
sensitivity of the correlation between increasing atmospheric CO2 levels and climate change has spot
an increase in the research and development for techniques that produce energy
with clean methods and that is renewable also. However, the fast tempo  which temperature at the globe  is increasing, will demand drastic actions for
reduction in CO2 emissions, that means restriction of the old ways for energy production
and  establishment of new clean energy
production ways that are also renewable. In order to combat the rising levels
of CO2, Carbon Capture and Storage (CCS) technologies have gained the
attention of researchers and environmentalists worldwide. This study will investigate
three of the most promising CCS technologies that will help at the reduction of
the anthropogenic climate change: (1) biomass carbon sequestration, (2) geographical sequestration, (3)
mineral carbon sequestration.

 

Biomass

An
interesting way to isolate carbon would be using biomass. Biomass a material
that produced form living organisms. Specifically,  the biomass is working as a storage for
energy as it uses  H2O +CO2 +Solar Energy = Biomass + O2. As it can be understood there is no need for
large amount of human recourses as the primary need is Sun light. Crops are considered
good option for the production of biomass. Although there would be need for
large areas of planting fields in order to produce sufficient amount of
biomass. On the other hand the sources of machines and generally the
agriculture reassures would produce significant amount  of CO2  in that scale. So the benefits of the biomass
would canceled with the CO2 emission that the agricultural sources would
produce.

 

 

The use of
algae for producing biomass would be more preferable in compare to the crops as
they do not demand cultivable land. The algae consume large amounts (80% to 99%
under optimum conditions) of CO2 as they grow and produce O2. There has been calculated
that an algal pond of 3600 acres would effectively capture 80% of a typical
200MWh natural gas-fired power plant’s CO2 emissions during daylight hours,
assuming an algal areal biomass productivity rate of 20g dry weight per square
meter per day. From all the above it can be understood that the Algae is the
most suitable method for CO2 capture than the crops.

Another efficient
way to store CO2 in a stable form of carbon is the biochar wich holds 90% of
carbon. Its produced by pyrolysis  which
is the direct thermal decomposition 
of biomass in the absence of oxygen,  which produces a mixture of solids, liquid,
and gas products. Also pyrolysis creates gases such as hydrogen and methane,
which are combustible fuel.

 

geologic
sequestration

Geologic sequestration demands 3 processes:
capturing CO2, transporting CO2 , and placing theCO2
in a geologic formation for
permanent or semi-permanent storage. The carbon dioxide is placed into the
geologic formation by means of a system of injection wells. An injection well is like an oil well or water
well, despite that instead of pumping 
oil or water out of the ground, CO2 is injected into the well. Injection wells are
also used for the disposal of various types of wastes and to enhance oil
recovery in some areas.  There
are studies that are suggesting to use deep saline aquifers that are deeper
than 1km from Earth’s surface, deeper than the freshwater sources, as a storage
place for the CO2 that
would be liquefied. The mechanisms for storing or isolating CO2 at aquifers are the followings, (a) Dissolution of
CO2 into the aquifer water, (b) Hydrodynamic trapping of a CO2 plume, (c) Occurrence of geochemical
reactions between CO2 and the aquifer fluids or rocks to form stable solids
carbonates. The geochemical reactions of CO2, aquifer fluids and rocks are
proceeding at a relatively slow pace. Although it has been discovered that high
concentrations of silicates in aquifers are accelerating the geochemical
reactions.

There are 2 types of aquifers the freshwater aquifers and the saline
aquifers. As it can  be understood the
freshwater aquifers are vital as they are drinking water and they are extremely
protected. Also the freshwater aquifers 
are shallower than the saline ones, another factor is that the
freshwater cannot hold high pressure as the saline ones so they are not
practical for efficient storage CO2 . In conclusion freshwater aquifers are not good location for geological
sequestration. On the other hand the saline ones are deeper and there is more
knowledge on that technology due to the injection technology. Also due to their
depth are making a better sealing with the outer surface so they are more
secure. However, their high level of availability makes them useful as they can
source big volume of CO2.

Apart from
the aquifers there are also depleted oil and gas field that with the technique
of Enhanced Oil Recovery (EOR) they can extract most of the amount of oil and
gas that is trapped in the fields, which in other case it would be unrecoverable.
By that way CO2 would be stored as the injected CO2 will reach with the oil.
Also those fields have proved their reliability due to the fact that they were
storage or oil and gas for thousands to millions of years. Another important
factor is that they are well known as they have been studied on the past and
they are capable of storing huge amounts of CO2

Mineral carbon sequestration

Mineral carbon sequestration is the reaction of CO2 with
a compound that gives a thermally stable and poorly soluble carbonates at
ambient conditions. Those carbonates contain the following elements iron,
magnesium and calcium. From those elements mainly the magnesium silicates and
the calcium silicates are the most common for carbon sequestration, those
materials are also well known around the word. On the other hand, iron has a
great value for making steel so I does not applies for carbon sequestration use.
Although, Australia seems to differ on that mater as it is known to have
big amounts of low-grade magnetite which can be used for sequestration.

In our days precipitated calcium carbonate is produced form carbonating
calcined limestone which is a calcium oxide but this procedure produce amount
of CO2 that is similar to the amount needed for the calcium carbonate formation.
As it can be understood this procedure would create a vicious circle. Also it
would be impossible a batch of calcined limestone to carbonate entirely. So
insead of beneficial this procedure would be problematic as I would release CO2
to the environment.