12/10/2020
What happens to sulphur oxides in an exhaust gas cleaning system using fresh water with a chemical additive such as sodium hydroxide? – EGCSA
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What happens when fuel
oils containing sulphur
are burnt in a diesel
What happens to sulphur oxides in an exhaust gas
cleaning system using fresh water with a chemical
additive such as sodium hydroxide?
engine without an
exhaust gas cleaning
system?
What are the e ects of
sulphur oxides on human
health and ecosystems?
What is an exhaust gas
cleaning system?
What qualities must the
In a freshwater scrubber using caustic soda, the simpli ed chemical reactions with
sulphur oxides are shown below. A mixture of sodium sulphite, sulphate and
bisulphite is produced. The proportion of each depends on the pH and amount of
oxidation [22]
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RELEVANT CHEMISTRY
Caustic Soda
NaOH(s) + H2O > Na+(aq) + OH–(aq) + H2O
water supplied to an
Sulphur Dioxide
exhaust gas cleaning
2Na+ + 2OH– + SO2 > Na2SO3 (aq sodium sulphite) + H2O
system have?

2Na+ + 2OH– + SO2 + ½ O2 > Na2SO4 (aq sodium sulphate) + H2O
https://www.egcsa.com/technical-reference/what-happens-to-sulphur-oxides-in-an-exhaust-gas-cleaning-system-using-fresh-water-with-a-chemical-additive-such-as-sodium-hydroxide/
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12/10/2020
What happens to sulphur oxides in an exhaust gas cleaning system using fresh water with a chemical additive such as sodium hydroxide? – EGCSA
How can it be con rmed
that the alkalinity of water
is suitable for scrubbing in
an open type exhaust gas
cleaning system?
Na+ + OH– + SO2 > NaHSO3 (aq sodium bisulphite)
Sulphur Trioxide
SO3 + H2O > H2SO4 (sulphuric acid)
2.NaOH + H2SO4 > Na2SO4 (aq sodium sulphate) + 2.H2O
What emissions can be
monitored to ensure that
scrubbed emissions
comply with the MARPOL
% sulphur-in-fuel
regulations?
What happens if an EGCS
emissions monitoring
system should
malfunction?
What happens to sulphur
oxides in an exhaust gas
cleaning system using
seawater?
How does the sulphate
from exhaust gas cleaning
systems a ect seawater
composition?
How does seawater bu er
or neutralize acids
created by scrubbing?
What happens to
sulphur oxides in an
exhaust gas cleaning

system using fresh
water with a chemical
https://www.egcsa.com/technical-reference/what-happens-to-sulphur-oxides-in-an-exhaust-gas-cleaning-system-using-fresh-water-with-a-chemical-additive-such-as-sodium-hydroxide/
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12/10/2020
What happens to sulphur oxides in an exhaust gas cleaning system using fresh water with a chemical additive such as sodium hydroxide? – EGCSA
additive such as sodium
hydroxide?
What levels of pollutants
can a typical wet exhaust
gas cleaning system
remove from an exhaust
stream?
How wet is the exhaust
gas after scrubbing?
If an exhaust gas cleaning
system adds or removes
CO2 won’t this make the
monitoring of emissions
to air inaccurate?
Do exhaust gas cleaning
technologies contribute to
increased global CO2
emissions?
How much particulate
matter could be
controlled by exhaust gas
cleaning systems?
How much sludge could
an exhaust gas cleaning
system produce?
How is it ensured that the
water discharged into the
sea does not harm the
environment?

What is the pH of the
water discharged from an
https://www.egcsa.com/technical-reference/what-happens-to-sulphur-oxides-in-an-exhaust-gas-cleaning-system-using-fresh-water-with-a-chemical-additive-such-as-sodium-hydroxide/
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12/10/2020
What happens to sulphur oxides in an exhaust gas cleaning system using fresh water with a chemical additive such as sodium hydroxide? – EGCSA
exhaust gas cleaning
system into the sea?
How is pH of the
discharge water
controlled?
Is the oxygen content of
the discharged water
measured?
What are PAHs?
How do exhaust gas
cleaning systems prevent
PAHs entering the sea?
Why is turbidity
measured?
What is nitrate?
How does exhaust gas
cleaning relate to
nitrogen-based nutrients
in the sea?
How are overboard
nitrate emissions
monitored?
What about the potential
environmental impact of
exhaust gas cleaning
systems using chemicals
for scrubbing?
References
https://www.egcsa.com/technical-reference/what-happens-to-sulphur-oxides-in-an-exhaust-gas-cleaning-system-using-fresh-water-with-a-chemical-additive-such-as-sodium-hydroxide/
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12/10/2020
What happens to sulphur oxides in an exhaust gas cleaning system using fresh water with a chemical additive such as sodium hydroxide? – EGCSA
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