There were untold alarming claims
circulating in the social media about radioactivity found in fish sold in Japan
and exported elsewhere being circulated worldwide in social media, despite
assurances from the Head of the International Atomic Energy Agency (IAEA) that
fish caught in the Pacific Ocean around Japan is safe with hardly any radioactivity
in them.
Now they even claim that vegetables
from Japan are also radioactive even though I cannot understand their logic how
‘radioactive water’ from the ocean managed to climb up onto dry land where
vegetables are grown. Vegetables are not grown in the Pacific Ocean for sure.
Personally, I have also written an
assurance that water in the Pacific Ocean hardly contains tritium or and
radioactive materials as an introduction under a separate title: “Why
is the Ocean Waters Salty? Is it getting Saltier?” here:
https://scientificlogic.blogspot.com/2023/08/why-is-ocean-waters-salty-is-it-getting.html
But Japan and some other countries
need energy to replace depleting fossil fuels like coal, gas and petroleum. It
is for this reason they use nuclear energy. But because nuclear reactors
require radioactive substances to fuel, they may leak out into the air, water
and soil such as wastewater discharge from the Fukushima nuclear reactor
following an earthquake and tsunami in Japan.
But Japan and countries all over
the world need energy to drive their economy. But because of this relentless
circulation on the Fukushima radioactive fear worldwide, I decided to pen this
article below whether or not we can find an endless source of extremely safe
energy for the entire world without using nuclear energy or depleting our fossil
fuels of coal, gas and oil any further.
Here's my views and input.
Since the first human ancestors
appeared between five million and seven million years ago, they have been
burning wood, branches, leaves and even animal carcasses for fire and warmth.
Thousands of years later they discovered fossil fuels such as coal, oil, gas to
burn and use. When fossil fuels and biomass are now running out, they are now
scrambling to find new ways to get energy.
With the help of their scientists,
they now find wind, waves and tides, the sun and geothermal energy as their
solutions for direct energy without polluting the environment. But they have
one problem.
They cannot put a sail, a windmill
or a waterfall on the back of their cars, on their buses, trains, or on the top
of their planes or even attach them in rockets to travel to the moon, mars or
other planets, except putting sails on sailing boats and sailing ships.
The powers from the sun, wind,
tides and waves are pure energy that we can only use on the spot. We cannot
carry them about or put them inside some container just like we put petrol
inside our car petrol tank, or cooking gas inside a cylinder in concentrated
form and carry them about and use them only when needed. We cannot do this with
the sun's energy or with the wind. We cannot carry a windmill everywhere. It
has to be something convenient and practical where we can store the energy
inside a container just like we do in batteries. The only way is to convert
pure energy like the heat of the sun or electricity into chemical energy where
we can store inside containers and use them when required like cooking gas
inside cylinders in a kitchen or batteries in a car.
We may put a reasonable sized solar
panel on a small bicycle to travel any distance in the daytime, perhaps even at
night if we also have a small solar storage battery installed on the bicycle
and use muscle power to pedal it at the same time. But we cannot go further
than that for long distances with large and massive vehicles such as
locomotives and trains.
Electric cars are noiseless and
non-polluting, but they are slower than petrol or gas fuelled cars.
Furthermore, batteries take a long time to charge, and battery-run vehicles
cannot go far. But it is okay if we are not in a hurry or need not travel far
or fast such as on bicycles, which is the most efficient and cheap machine
humans have ever invented.
Even if we use electric batteries
on heavier vehicles, it is not possible to electrify everything such as ships,
planes and even rockets. It has to be practical and convenient.
Fortunately, we have a fuel that
can never run out, and that is hydrogen, and this is something we can store
inside a gas cylinder with some risk of fire or explosion.
Alternatively, we can store the
hydrogen inside some inert substances to be released later as required. We
shall explain this shortly.
The most common and abundant
element in the universe is hydrogen. It accounts for about 75 percent of
its normal matter and was created in the Big Bang. In fact, all the energy
generated by our Sun and the stars in the entire universe comes from hydrogen
by fusion reactions when two nuclei come together to form one atom.
The sun fuses two hydrogen atoms
together to produce helium. As a main-sequence star, the sun generates its
energy by nuclear fusion of hydrogen nuclei into helium. In its core, the
Sun fuses 620 million metric tons of hydrogen and makes 616 million metric tons
of helium each second. The sun fuses two hydrogen atoms together to produce
helium.
In this fusion of hydrogen into
helium, the sun each second releases energy equivalent to 384.6 septillion
watts (3.846×1026 W).
Of course, we cannot create an
artificial sun on Earth for long-term practical use. China's
"artificial sun" has set a new world record after superheating a loop
of plasma to temperatures five times hotter than the sun for more
than 17 minutes, smashing the previous record, set by France's Tore Supra
tokamak in 2003, where plasma in a coiling loop remained at similar
temperatures for only 390 seconds. That was the best we could achieve, but not
for long term supply of energy.
Here on Earth, we have coal, oil
and gas as the main sources of our energy needs. But these resources as I have
said are fast being depleted.
Fortunately, with the blessings
from God, we have oceans of water on Earth with hydrogen inside. It is an
unending source of energy, very clean and non-polluting too. Allow me to
explain.
Weight for weight, hydrogen stores
3 times more energy than petrol and 4 times that of coal. We have roughly 1.335
billion cubic kilometres of water in the oceans. But if we consider all the
waters available on Earth it would be about 1,386 million cubic kilometres.
This is 1.39 x 10 21 litres, or 139 billion trillion
litres. (One cubic km = 10 12 litres). We can harvest all
the energy stored in these horrendous amounts of water on Earth. But how? Allow
me again to explain further.
One litre of water produces 1235
litres of hydrogen since 1 mol of water produces 1 mol of hydrogen
and 1/2 mol of oxygen according to Avogadro's law, the volume of hydrogen is
about twice that of oxygen.
When hydrogen is burned, 286,000
joules of energy is released per mole of hydrogen. One litre of hydrogen under
standard pressure and temperature is 1/22.4 mol, so a litre of water can give
about 13 kilojoules of thermal energy.
Under practical circumstances after
thermal loss during conversion, this can result in between 4 and 6 kilojoules
of electrical energy when 1 litre of hydrogen is burned.
Since there are 1.39 x 10 21 litres
of water on Earth, calculated out, the total amount of thermal energy we can
get out of water is to the tune of 5.6 x 10 21 to 2.2 x 10 25 kilojoules
or when converted into electrical energy with losses it amounts to 6.8 x 10 24 joules
to 1025 kilojoules (6800 billion trillion to 10 trillion,
trillion kilojoules).
Wow! This is a whopping, whopping
lot of energy, far, far more energy than the entire Earth needs for tens of
thousands of years to come, and renewable too without ending. They provide us
cycles after cycles of free-wheeling energy.
But there is a catch and a big
problem here.
Water is two parts of hydrogen and
one part of oxygen. But the chemical energy that binds them together are
strongly held by chemical bonds, and it would require the same amount of energy
such as using electricity through electrolysis to break them apart into two
parts of hydrogen and one part of oxygen something we know since 1800 when
English scientists William Nicholson and Anthony
Carlisle used it to electrolyse water. In 1806 Humphry
Davy reported the results of extensive distilled water electrolysis
experiments. (Electrolysis is the process of using electricity to split water
into hydrogen and oxygen. This reaction takes place in a unit called an
electrolyser).
But this problem has an easy
solution in my eyes. We can generate electricity by using wind in windmills,
solar energy in solar panels, water as tides or even using geothermal energy as
a promising alternative for carbon-free hydrogen production other than using
nuclear power to generate electrolysis. We can then use these sources of energy
to split water. But how much?
The surface area of Earth is given
by 4 x pi x radius squared. The radius of Earth is 6 378.1 kilometres
(6,378,100 metres). Hence its surface area is 5.11 x 10 14 square
metres (511 trillion m²) approximately since the radius of Earth is
not the same all over - the radius of Earth at the equator is 6,378 kilometres,
and polar radius is 6,356 km — a difference of 22 km according to NASA's
Goddard Space Flight Centre in Greenbelt, Maryland.
Of the 511 trillion m² area 70
% is ocean, the remaining 30 % land. Out of the 30 % land, about 33% is
desert and about 24% is mountainous, leaving us with 15.77 billion acres or
about 63819 billion square metres of habitable land to place all our windmills
and electricity-generating devices including solar panels to collect solar
energy directly from the sun where the half the earth receives sunlight 12
hours a day and the other half, sunshine for the remaining 24 hours on an
average. The amount of energy earth receives, called solar constant, is
1.361 kilowatts per square meter (kW/m2) at solar
minimum (the time in the 11-year solar cycle when the number
of sunspots is minimal) and approximately 0.1% greater (roughly
1.362 kW/m2) at solar maximum. 1 Watt = 1 Joule per
second (1W = 1 J/s) which means that 1 kW = 1000 J/s. These are the areas
on land where we may collect solar energy, except for the oceans where we can
use the waves and tides.
On land we can also burn the
hydrogen from water harvested from the ocean, and when hydrogen is burned, it
yields energy and turns back into water and nothing else that is polluting is
left. It is absolutely so clean and 100 % renewable. The water returns to the
oceans from where it came.
However, we have one problem. The
electrolysis of water requires a minimum of 237 kJ of
electrical energy input to dissociate each mole of water and this is the amount
of energy we can get out of water by burning the hydrogen as we get out of
water by electrolysis. It also requires energy to overcome the change in
entropy of the reaction. Therefore, the process cannot proceed below 286 kJ per
mol if no external heat/energy is added. The disadvantage with water
electrolysis is that it is a very energy-intensive process.
So, we would be back to square one,
trying to get something out of nothing. How shall we solve this problem?
Fortunately, as I have already
mentioned, we have the wind and waves to generate electricity to break open the
water molecules into two parts of hydrogen and one part of oxygen. We can then
also store the electricity generated by wind, water, solar power or even
geothermal power inside batteries to run our cars, buses and even trains. They
are non-polluting and this source of energy is better than using coal, oil and
gas.
Electrolysis of water for
energy in hydrogen storage is being very actively pursued. Once generated,
there are numerous uses for hydrogen too, as in electrical and natural gas
grid, mobility, biogas, and in fertilizer applications.
One new approach that is being
studied is photo-electrolysis, the generation of electricity using photovoltaic
cells to split water molecules. This technique is still in the research stage,
but this too appears to be a very promising source of power in the future.
What is even more delightful when
using water electrolysis to tear the water apart for hydrogen is, the oxygen
that it also liberates to burn the hydrogen is exactly in the same amounts it
releases into the air.
But one disadvantage is, hydrogen
is the lightest gas known and this occupies a lot of space to store, and it is
also very difficult to compress or liquify it to put them into small containers
for cars or buses. It is also very easy to catch fire and can cause an
explosion if there is a leak in the storage tanks.
But there is one way we can
overcome this problem. We can store the hydrogen in metals and alloys. For
instance, scientists found that iron-titanium alloy or ferrotitanium with
between 10 and 20% iron and 45–75% titanium and sometimes a small amount of
carbon which when cold can store large quantities of hydrogen, and when
moderately heated up will release all the hydrogen.
So are many other metals and
alloys, such as magnesium that can theoretically absorb hydrogen up to 7.6
percent of its own mass, but in practice the capacity
of magnesium hydride to store hydrogen does not exceed 5 to 6
percent. However, by adding nickel and palladium to the magnesium
hydride, we can obtain a material that can accumulate about 7
percent hydrogen by weight.
These hydrogen storage alloys will
release large quantities of hydrogen bit by bit as required when slightly
heated to give us a new type of hydrogen storage batteries. It can be
used in large batteries, especially for large electric vehicles, hybrid
electric vehicles, and high-power applications. These will solve our problem
about fire and explosions if hydrogen tanks are used.
Fortunately, there is yet another
way we can tame hydrogen as an alternative fuel. We can combine hydrogen with
carbon dioxide to produce methyl alcohol and methane although less energy
weight for weight, but the advantage is they are less explosive. Methanol
(methyl alcohol) and methane would be convenient and plentiful sources of
energy. The conversion of hydrogen and carbon dioxide into methane, or the
methanation of carbon dioxide is called the Sabatier reaction.
Yet another possibility we can
think of is to use only hydrogen and carbon dioxide and a catalyst to
produce propane, butane, petrol or other hydrocarbon fuels by manipulating a
series of chain reactions as Stanford scientists have done "by changing
carbon dioxide into gasoline (petrol) 1,000 times more efficiently”.
Petrol contains a chain of 5 to 12 carbon atoms in each molecule
that can be obtained from carbon dioxide. The oxygen in the carbon
dioxide to produce petrol is again left out in the reaction and released into
the air.
This means whatever we use up will
finally be released into the atmosphere, plus energy we only want. What a
beauty, at least in my eyes!
We will after all be able to
synthesize petrol without needing to find them from beneath the ground or under
the sea, what more such a synthesis is non-polluting. We leave nothing when
burnt as fuel except we get back the carbon dioxide and water we started with,
leaving nothing else.
What a beauty in chemistry without
needing to know physics and nuclear physics to produce nuclear energy in
reactors that has caused us so much anxiety on radioactivity as in the
Fukushima, the Chernobyl, the Kyshtym disasters and the
Windscale fire.
In summary, all we need is the
energy from the sun to drive the winds and waves, and from gravity of the moon
for tidal energy to get electricity, and from electricity to split up all the
waters in the oceans and all the waters available on Earth into hydrogen and
oxygen, plus energy as well as a bonus which will last for as long
as mankind needs them, while the Sun and the Moon are still around.
Our sun will be with us for an estimated 7 to 8 thousand million more
years, while the Moon will be receding from us at the rate of 3.78
centimetres per year to conserve angular momentum due to tidal forces that make
the oceans bulge and cause Earth’s rotation to lose momentum. But that shall be
long, long after humanity no longer exists on earth from the way we produce,
consume, congest and pollute. But that’s another story.
(A 2,866 worded essay in 11 pages
by this blogger dedicated to all who cherish their existence)