Designing Chlorine dosing pump capacity for STP and percentage of Chlorine used for disinfection in Sewage Treatment Plant
Sewage treatment plants play a crucial role in maintaining the health and well-being of communities by treating wastewater before it is discharged into the environment. Chlorine dosing is an essential part of the treatment process as it helps to disinfect the treated wastewater before it is discharged. In this article, we will discuss the design of chlorine dosing pump capacity for sewage treatment plants and the percentage and quantity of chlorine required for disinfection.
Design of Chlorine Dosing Pump Capacity
The chlorine dosing pump capacity required for a sewage treatment plant depends on several factors such as the flow rate of wastewater, the concentration of chlorine required for disinfection, and the contact time required for effective disinfection.
The dosing pump capacity is calculated based on the following formula:
Chlorine Dosage (mg/L) = (Chlorine Demand (mg/L) + Chlorine Residual (mg/L))/ ContactTime (min)
Where:
Chlorine Demand: The quantity of chlorine required, as determined by laboratory tests, to disinfect the effluent.
Chlorine Residual: The bare minimum of chlorine required to keep the water's residual chlorine level at a safe level after disinfection.
Contact Time: The amount of time chlorine is in contact with the wastewater.
The capacity of the dosing pump can be computed depending on the water flow rate once the necessary chlorine dosage has been established.
Percentage and Quantity of Chlorine for Disinfection
Chlorine is commonly used for disinfection in sewage treatment plants due to its effectiveness in killing pathogens and its relatively low cost. The percentage and quantity of chlorine required for disinfection depend on the concentration of chlorine required and the volume of wastewater being treated.
Concentration of Chlorine Required
The concentration of chlorine required for disinfection in sewage treatment plants is typically between 0.5 to 5 mg/l, depending on the quality of the wastewater being treated. Higher concentrations of chlorine may be required for heavily contaminated wastewater.
Types of Chlorine Used for Disinfection:
Chlorine is a widely used disinfectant in sewage treatment plants to remove harmful bacteria and viruses from wastewater before it is released back into the environment. There are several types of chlorine used for disinfection, each with different characteristics and quantities used.
The three main types of chlorine used in sewage treatment plants are:
1. Chlorine gas: This is the most commonly used form of chlorine in water treatment plants. Chlorine gas is highly effective at killing bacteria and viruses and is relatively easy to use. However, it is also highly toxic and can be dangerous if not handled properly. Typically, chlorine gas is used in quantities ranging from 0.5 to 5 mg/L.
2. Sodium hypochlorite: This is a liquid form of chlorine that is commonly used in small to medium-sized water treatment plants. Sodium hypochlorite is easier to handle than chlorine gas, but it is also less effective and can be more expensive. Typically, sodium hypochlorite is used in quantities ranging from 2 to 20 mg/L.
3. Calcium hypochlorite: This is a solid form of chlorine that is commonly used in large water treatment plants. Calcium hypochlorite is highly effective at killing bacteria and viruses and is relatively easy to use. However, it is also more expensive than chlorine gas and sodium hypochlorite. Typically, calcium hypochlorite is used in quantities ranging from 2 to 20 mg/L.
Conclusion
It is important to note that the quantity of chlorine used in sewage treatment plants will vary depending on a variety of factors, including the size of the plant, the quality of the wastewater being treated, and the desired level of disinfection. In addition, the use of chlorine in sewage treatment plants must be carefully monitored to ensure that the disinfection process is effective without causing harm to the environment or public health.
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