This
can be practicable through oxidation or aeration of water. Free oxygen in the
air is allow to come in contact with water and this also helps to purify the
water.
can be practicable through oxidation or aeration of water. Free oxygen in the
air is allow to come in contact with water and this also helps to purify the
water.
Note: in many cases, the pollution is so great that natural
processes cannot deal with them, thus may still need further treatment, it
requires artificial purification for the purpose of odour aeration. It involves
the purification by special devices and it is done in either of the following
methods physical or chemical agents.
processes cannot deal with them, thus may still need further treatment, it
requires artificial purification for the purpose of odour aeration. It involves
the purification by special devices and it is done in either of the following
methods physical or chemical agents.
Physical
method: this is the artificial aeration of water by heat, it could be either by
distillation or boiling.
method: this is the artificial aeration of water by heat, it could be either by
distillation or boiling.
Chemical
method: this is the aeration of odour and purification of water with the use of
chemicals to stabilize the odour of the water, it through sedimentation, filteration
and chlorination (addition of bleaching powder, hydroxide of lime or potassium
permanganate).
method: this is the aeration of odour and purification of water with the use of
chemicals to stabilize the odour of the water, it through sedimentation, filteration
and chlorination (addition of bleaching powder, hydroxide of lime or potassium
permanganate).
Biochemical oxygen demand (BOD)
Biochemical
oxygen demand is the measure of the amount of dissolve oxygen in water consumed
or used by microorganism to discompose organic pollutant in the water at 200c in five days. The higher the value the
more the water is polluted with organic matter.
oxygen demand is the measure of the amount of dissolve oxygen in water consumed
or used by microorganism to discompose organic pollutant in the water at 200c in five days. The higher the value the
more the water is polluted with organic matter.
Chemical oxygen demand (COD)
Chemical
oxygen demand is the amount of the strong oxidizing chemical, potassium dichromate
k2cr207 value required to oxidize all
oxidizable inorganic substance (non-biodegradable pollutants) to Co2
and H2O. The higher the value of COD the more the water is polluted
with inorganic substances.
oxygen demand is the amount of the strong oxidizing chemical, potassium dichromate
k2cr207 value required to oxidize all
oxidizable inorganic substance (non-biodegradable pollutants) to Co2
and H2O. The higher the value of COD the more the water is polluted
with inorganic substances.
