Generalities
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1.2.1.3.3 .Agricultural wastewater
It includes drainage and farm wastewater. It is characterized by the presence
of high concentrations of fertilizers, pesticides and insecticides, as well as a very high fertilizing
value (Kellogg et al., 2000).
1.2.1.3.4. Storm water
Stormwater, also known as urban stormwater, is runoff water from atmospheric precipitation.
That picks up impurities when it comes into contact with the air (industrial fumes), then as it
runs off residues deposited on city pavements and roofs (fuels, tire residues and heavy metals,
waste oils...) (Mecheref & Mahfouf, 2016).
1.2.1.4 .Main characteristics of wastewater
In the field of wastewater treatment, the measurement of water quality is based on a number of
parameters, which must be taken into account in: the design of the treatment plant, the choice
of treatment process, the dosage of reagents and/or the measurement of pollutant removal. The
main characteristics of wastewater are :
potential of Hydrogen (pH): pH plays an important role in effluent purification, as it
has the ability to decrease or increase the mobility of elements such as metal ions in
bioavailable solution and thus their toxicity (Merair & Salmi, 2014).
Temperature: an important ecological factor affecting pH, solubility of salts and
especially gases, as well as determining the origin of water and any mixtures (Rodier
et al., 2005).
Suspended Solids (SS): include insoluble matter suspended in the liquid, such as large
organic and mineral matter.
Chemical Oxygen Demand (COD): represents the quantity of oxygen required to
oxidize chemically organic compounds present in wastewater. The value of the
COD/BOD ratio indicates the biodegradability coefficient of an effluent (Rodier et al.,
2005). COD values generally vary :
• COD = 1.5 to 2 times BOD For urban wastewater.
• COD = 1 to 10 times BOD For all wastewaters.
• COD> 2.5 times BOD for industrial wastewater (Metahri, 2012).
20
1.2.1.3.3 .Agricultural wastewater
It includes drainage and farm wastewater. It is characterized by the presence
of high concentrations of fertilizers, pesticides and insecticides, as well as a very high fertilizing
value (Kellogg et al., 2000).
1.2.1.3.4. Storm water
Stormwater, also known as urban stormwater, is runoff water from atmospheric precipitation.
That picks up impurities when it comes into contact with the air (industrial fumes), then as it
runs off residues deposited on city pavements and roofs (fuels, tire residues and heavy metals,
waste oils...) (Mecheref & Mahfouf, 2016).
1.2.1.4 .Main characteristics of wastewater
In the field of wastewater treatment, the measurement of water quality is based on a number of
parameters, which must be taken into account in: the design of the treatment plant, the choice
of treatment process, the dosage of reagents and/or the measurement of pollutant removal. The
main characteristics of wastewater are :
potential of Hydrogen (pH): pH plays an important role in effluent purification, as it
has the ability to decrease or increase the mobility of elements such as metal ions in
bioavailable solution and thus their toxicity (Merair & Salmi, 2014).
Temperature: an important ecological factor affecting pH, solubility of salts and
especially gases, as well as determining the origin of water and any mixtures (Rodier
et al., 2005).
Suspended Solids (SS): include insoluble matter suspended in the liquid, such as large
organic and mineral matter.
Chemical Oxygen Demand (COD): represents the quantity of oxygen required to
oxidize chemically organic compounds present in wastewater. The value of the
COD/BOD ratio indicates the biodegradability coefficient of an effluent (Rodier et al.,
2005). COD values generally vary :
• COD = 1.5 to 2 times BOD For urban wastewater.
• COD = 1 to 10 times BOD For all wastewaters.
• COD> 2.5 times BOD for industrial wastewater (Metahri, 2012).