184
R. Sukanya Devi et al.
The modelling or design of an UV/H 2 O 2 oxidation process for a wastewater
treatment plant is not easily done using the complete theoretical approach. The main
reasons for this are as follows:
• The characteristics of the effluent are complex and variable.
• It is expensive to conduct full effluent characterization.
• Requires advanced numerical solutions to overcome complex mathematical model
for practical applications.
• Better and quite precise results can be obtained by a simplified model which
considers all the uncertainties that are involved in the process design.
3.2.2 UV/Ozone
Combining UV and O 3 [41] and treating wastewater are a proven technology. This
technology is more advantageous than the individual ozone and UV treatment as it
has advantages of both by generating hydroxyl radical when UV light when reacts
with the ozone. The reactions are as follows
O 3 + H 2 O −→ uvH 2 O 2 + O 2
(3.4)
H 2 O 2 −→ uv2OH
∗
(3.5)
2O 3 + H 2 O 2 −→ uv2OH
∗
(3.6)
The hydroxyl radical which is formed either completely degrades the organic
pollutant in the wastewater to CO 2 and water or to simpler degradable compounds
which can be easily digested in the further biological process.
Since ozone is highly unstable and reactive, it is produced separately and passed
through the UV lamp reactor. The UV lamps are placed inside a quartz sleeves to
achieve better transmission of UV light. In non-contact type, a transparent separator
film is used to separate the UV lamp and the effluent.
3.3 Electrochemical Oxidation Process
In the electrochemical oxidation process, free hydroxyl radicals are generated,
which will attack the organic pollutants in the wastewater. There are two types of
electrochemical oxidation process
1. Direct Electrochemical Oxidation process.
2. Indirect Electrochemical Oxidation Process.
R. Sukanya Devi et al.
The modelling or design of an UV/H 2 O 2 oxidation process for a wastewater
treatment plant is not easily done using the complete theoretical approach. The main
reasons for this are as follows:
• The characteristics of the effluent are complex and variable.
• It is expensive to conduct full effluent characterization.
• Requires advanced numerical solutions to overcome complex mathematical model
for practical applications.
• Better and quite precise results can be obtained by a simplified model which
considers all the uncertainties that are involved in the process design.
3.2.2 UV/Ozone
Combining UV and O 3 [41] and treating wastewater are a proven technology. This
technology is more advantageous than the individual ozone and UV treatment as it
has advantages of both by generating hydroxyl radical when UV light when reacts
with the ozone. The reactions are as follows
O 3 + H 2 O −→ uvH 2 O 2 + O 2
(3.4)
H 2 O 2 −→ uv2OH
∗
(3.5)
2O 3 + H 2 O 2 −→ uv2OH
∗
(3.6)
The hydroxyl radical which is formed either completely degrades the organic
pollutant in the wastewater to CO 2 and water or to simpler degradable compounds
which can be easily digested in the further biological process.
Since ozone is highly unstable and reactive, it is produced separately and passed
through the UV lamp reactor. The UV lamps are placed inside a quartz sleeves to
achieve better transmission of UV light. In non-contact type, a transparent separator
film is used to separate the UV lamp and the effluent.
3.3 Electrochemical Oxidation Process
In the electrochemical oxidation process, free hydroxyl radicals are generated,
which will attack the organic pollutants in the wastewater. There are two types of
electrochemical oxidation process
1. Direct Electrochemical Oxidation process.
2. Indirect Electrochemical Oxidation Process.