A Sequential Batch Reactor (SBR) is a wastewater treatment process that works in several stages, including filling, aeration, settling, and decanting. This process is mainly used to treat the wastewater by removing the nutrients, like nitrogen and phosphorus, through organic decomposition, leaving the treated water at the top of the basin, and settling the waste at the bottom.
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What is an SBR Decanter?
SBR Decanter is a mechanical device that is used to pull out the treated water from the top surface of the tank after the decant stage in the operational cycle. It is responsible for separating and removing the treated water from the sludge and safely pulling the treated water out of the basin. If there is no decanter, there is a higher chance that the treated water still contains sludge and other organic wastes.
Features of SBR Decanter
- High removal capacity
- Compliant with discharge standards
- Versatile application for different sizes
- High & stable performance
- Applicable for batchwise and continuous operation
- Low maintenance and minimum operating cost
- Flexible operation
How does a SBR Decanter work?
It is a circular part of the SBR, which works on the principle of gravity and differential pressure, and helps to clarify the treated water without disturbing the settled sludge underneath. Decanter plays an important role in clarifying the treated water; without it, it is not possible to pull out only the treated water, and then there will be a higher chance that the water will remain with solids and other organic wastes.
Types of SBR Decanters
Floating Decanters – Floating decanters, also known as SwingCanter, are the most common type of decanters, which are designed to separate the sludges from the clear water by settling the sludges at the bottom of the basin with a rotational aid that adjust its position with the water level to draw the waste water from the tank.
Pump Decanters – It uses a pump, like a submersible or suction, to remove the clarified wastewater from the SBR basin. It provides more precise control over discharge flow and can be used in situations where gravity flow is not ideal.
Mechanical Decanters – It uses a strong mechanical arm or rotating mechanism to move the decanter or skimmer across the basin surface. The usage of this type of decanter is less, but it can be suitable for specific applications.
Fixed Decanters – The fixed decanters are present at a stationary point where they remove the wastewater from the specific point. Their designs are typically simple and can be less expensive than other types.
Conclusion
The decanter is used to pull out the clarified water from the wastes present during the operational cycle. The decanter works in the decant phase of the operational cycle, where it uses gravity and other differential pressures to eliminate the sludges from the water and settle the solids at the bottom of the tank, and also with the removal of nutrients like nitrogen and phosphorus, it pull the treated water from the upper surface of the tank.
Frequently Asked Questions About SBR Decanters: Role in Sequencing Batch Reactors and Sludge Removal
Question 1. Difference between Fixed and Floating Decanters?
Answer- A fixed decanter is secured at a stationary height, making it appropriate for vertical tanks and used to draw water from a specific point in the tank. Whereas, a floating decanter adjusts its position with the water level, providing flexibility to draw water from the highest point of the tank
Question 2. Does a decanter accommodate a large volume of waste?
Answer- Yes, they are engineered to handle high volumes of wastewater due to their high separation efficiency to remove the sludge from the wastewater to pull out only the treated water. They are designed to handle small to large-scale treatment plants.
Question 3. How do decanters prevent the mixing of sludge with treated water?
Answer- Decanter prevents the mixing of sludge with the treated water with the help of gravity and other differential pressures, or centrifugal forces. Due to gravity separation, the heavier solids settle down at the bottom, leaving the treated water at the top of the tank. The decanter centrifuges use high-speed rotation, which allows solids to separate from the clarified water.
Question 4. Is the maintenance of decanters expensive?
Answer- The maintenance of the decanter is generally moderate, as it requires only a few tanks and equipment, unlike conventional systems, which reduce the cost of the decanter. The maintenance charge for a decanter in India lies in the range of 3,25,000 – 7,50,000. The maintenance charge depends on the supplier company. Here you can contact Adroit, which provides you with the best engineered design equipment at very cost-effective maintenance charges.
Question 5. Do SBR decanters assist in the removal of nutrients?
Answer- Yes, SBR decanters do help in removing nutrients like nitrogen and phosphorus. The SBR, including its decanter, is designed to deal with the BNR (Biological Nutrient Removal) system by using the biological process to remove the nutrients from the water.
