How to design treated water tank capacity in STP?
Technology for wastewater purification has advanced quickly in recent years. The goal of the water treatment process is to either remove existing contaminants from the water or to decrease their level so that the water is suitable for the intended end use. Releasing recycled water to the environment without having a negative ecological effect is one of the most crucial uses. Wastewater storage tanks are extensively used across various sectors, such as light industry, wastewater treatment plants, and environmental protection projects, in addition to being used to store sewage. A crucial part of the wastewater purification system is the wastewater storage tank. Commercial wastewater, residential sewage, and biogas can all be stored in water tanks.
In this blog, we'll go over in depth how to build a sewage treatment plant's treated water tank capacity and the calculation formula with retention time.
Retention time refers to the period of time that an amount of sewage is held in a pumping installation, hydraulic sump, pipelines, retention basin, or other similar structure. By dividing the retention volume by the discharge flow from the storage structure, one can calculate the retention duration.
Design aspects of treated water tank:
1. Number of water storage tanks: For each region served by an urban water system, there should be at least one elevated tank. To increase efficiency and pump control when one tank is out of operation for inspection, maintenance, painting, or other tasks, two tanks (or a tank with two compartments) are preferred. The highest water pressure that can be used in the portion of the distribution system connected to an elevated tank depends on its height. To enable efficient and fair water distribution, the town is divided into a number of regions with autonomous storage reservoirs.
2. Location: For controlling the amount of pressure in the water distribution network, the storage reservoir's position is crucial. The storage reservoir is typically placed as far away from the distribution area's centre as feasible and at its highest point. The sort of storage facilities that need to be included in a water supply system and the overall layout of the system both depend significantly on the topography of the area where the water is distributed. The placement of ground-level storage systems at higher elevations (on hills) in some circumstances enables gravity supply to all or parts of a distribution region or pressure zone. The geological characteristics of storage tanks at higher altitudes can also be used to lower the height requirements for ERs and provide broader pressure zone coverage.
3. Elevation of the tank: The elevation of the storage reservoir should be set in accordance with the supply of economically viable pipe sizes in the distribution network in order to maintain the minimal residual pressure in the distribution system. Considering the ensuing factors, the storage reservoir's level is set. In order to sustain the distribution system's minimum residual pressure, The G.L at the furthest location in the distribution system and the distance between it and the service reservoir The G.L. at the highest elevation in the distribution system, excluding the site of the service reservoir; and the approximate head loss due to friction over the distance to the reservoir's farthest point.
Formula used for calculating the treated water tank capacity:
Treated water tank capacity = Retention time x Flow rate
The retention time is generally estimated in accordance with the desired effluent quality, which is calculated by the regulatory requirements and the receiving water body's capacity. The effluent quality requirements, which wastewater treatment facilities must meet before releasing the water that has been treated into the receiving water body, are usually set by the regulatory organizations.
Let's suppose the following demonstrates how to calculate the treated water tank's capacity:
To make sure that the treated water reaches the appropriate levels of quality before it is discharged, it is essential to design the treated water tank capacity in a sewage treatment facility. When designing the treated water tank capacity, the retention time is a crucial element to take into account. It is determined by dividing the tank's volume by the wastewater flow rate. The retention period must be multiplied by the flow rate in order to determine the volume of the treated water tank. Wastewater treatment facilities can design a treated water tank that satisfies the required retention time and effluent quality standards by taking the aforementioned variables into account. Flow rate = 800 m3/day Retention time = 24 hours (1 day).
Using the formula above, the treated water tank capacity would be:
Treated water tank capacity = 24 x 800 = 19,200 m3
This means that a treated water tank with a capacity of 19,200 m3 would be required to meet the desired retention time of 24 hours for a flow rate of 800 m3/day.
To make sure that the treated water reaches the appropriate levels of quality before it is discharged, it is essential to design the treated water tank capacity in a sewage treatment facility. When designing the treated water tank capacity, the retention time is a crucial element to take into account. It is determined by dividing the tank's volume by the wastewater flow rate. The retention period must be multiplied by the flow rate in order to determine the volume of the treated water tank. Wastewater treatment facilities can design a treated water tank that satisfies the required retention time and effluent quality standards by taking the aforementioned variables into account.
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