CHEMICAL ENGINEERING QUESTIONS
WITH 100% CORRECT ANSWERS {
GRADED A+}
Softening - ✔✔refers to the processes which remove or reduce the
hardness of the water
Purification - ✔✔is the term applied to the removal of organic and
microorganisms from water
Clarification - ✔✔removes suspended solids and particulate matter
Ion Exchange - ✔✔performed in water softening aiming to reduce the
calcium and magnesium content of the water
Lime-Soda Processes - ✔✔This process involves the use of slaked lime
and soda ash to precipitate calcium and magnesium from the hard water.
,These precipitates are then removed by conventional processes of
coagulation/flocculation, sedimentation, and filtration
Phosphate Conditioning - ✔✔This process is used in the internal
conditioning of boiler water and conditioning of cooling and process
water, , adding sodium phosphate to react with magnesium and calcium
salt will form a non-adherent, easily removable, and soft sludge of
calcium phosphate and magnesium phosphate.
Deaeration - ✔✔this procedure deals with conditioning water properly
to minimize the deterioration of the industrial boiler, aims to decrease
the concentration of dissolved gasses such as oxygen, carbon dioxide,
and ammonia during the heating of water.
Electrodialysis - ✔✔utilizes ion-exchange membranes in an electric-
field resulting in a salinity decrease in one space and salinity increase in
the next space
, Primary treatment - ✔✔is designed to remove 30% to 60% of the
suspended solids and reduce BOD by a like amount. The effluent is
usually chlorinated to remove bacteria and viruses.
Secondary treatment - ✔✔reduces BOD by 85% to 90% by oxidizing
dissolved organic materials.
Tertiary sewage treatment - ✔✔involves further processing steps,
usually for the removal of pollutants with no BOD, where it contains
nitrogen, phosphorus, and carbon compounds in solution.
Peat - ✔✔. It refers to a wet, partially decomposed organic matter
derived mostly from plants that have accumulated under conditions of
waterlogging, oxygen deficiency, acidity, and nutrient deficiency
Lignite - ✔✔mainly used in electricity generation, is a fuel intermediate
between peat and coal and is the lowest grade coal with the least carbon
content
WITH 100% CORRECT ANSWERS {
GRADED A+}
Softening - ✔✔refers to the processes which remove or reduce the
hardness of the water
Purification - ✔✔is the term applied to the removal of organic and
microorganisms from water
Clarification - ✔✔removes suspended solids and particulate matter
Ion Exchange - ✔✔performed in water softening aiming to reduce the
calcium and magnesium content of the water
Lime-Soda Processes - ✔✔This process involves the use of slaked lime
and soda ash to precipitate calcium and magnesium from the hard water.
,These precipitates are then removed by conventional processes of
coagulation/flocculation, sedimentation, and filtration
Phosphate Conditioning - ✔✔This process is used in the internal
conditioning of boiler water and conditioning of cooling and process
water, , adding sodium phosphate to react with magnesium and calcium
salt will form a non-adherent, easily removable, and soft sludge of
calcium phosphate and magnesium phosphate.
Deaeration - ✔✔this procedure deals with conditioning water properly
to minimize the deterioration of the industrial boiler, aims to decrease
the concentration of dissolved gasses such as oxygen, carbon dioxide,
and ammonia during the heating of water.
Electrodialysis - ✔✔utilizes ion-exchange membranes in an electric-
field resulting in a salinity decrease in one space and salinity increase in
the next space
, Primary treatment - ✔✔is designed to remove 30% to 60% of the
suspended solids and reduce BOD by a like amount. The effluent is
usually chlorinated to remove bacteria and viruses.
Secondary treatment - ✔✔reduces BOD by 85% to 90% by oxidizing
dissolved organic materials.
Tertiary sewage treatment - ✔✔involves further processing steps,
usually for the removal of pollutants with no BOD, where it contains
nitrogen, phosphorus, and carbon compounds in solution.
Peat - ✔✔. It refers to a wet, partially decomposed organic matter
derived mostly from plants that have accumulated under conditions of
waterlogging, oxygen deficiency, acidity, and nutrient deficiency
Lignite - ✔✔mainly used in electricity generation, is a fuel intermediate
between peat and coal and is the lowest grade coal with the least carbon
content
