SBR Wastewater Treatment Technology: An Advanced Method Adopted by Many Developed Countries. SBR, which stands for Sequencing Batch Reactor**, is an advanced method for treating wastewater in batches.
1. Structure of SBR Wastewater Treatment Technology
An SBR system typically consists of two tank groups:
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Selector Tank
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C-tech Tank
Wastewater is usually fed into the Selector tank and then pumped into the C-tech tank. The Selector tank is typically aerated to facilitate aerobic treatment. The C-tech tank is where the five phases of treatment, described below, take place.
2. Operating Principles of the SBR Tank
The SBR wastewater treatment system operates in a cyclic manner, typically consisting of five phases:
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Filling Phase (Fill): Wastewater is pumped into the tank, which can adapt to various processes: static filling, mixing filling, and aerated filling.
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Reaction Phase (React): This phase provides the aeration needed for biochemical reactions. Organic matter decomposition occurs during this phase. To ensure effective treatment, it's important to identify and control input parameters such as N, P, COD, and BOD, which also helps the subsequent phases operate more efficiently.
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Settling Phase (Settle): Treated wastewater is clarified, and sludge is concentrated. This phase typically concludes within two hours.
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Decanting Phase (Draw): The duration of this phase is proportional to the volume of incoming wastewater.
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Idle Phase (Idle): This can be understood as a waiting period before a new treatment batch begins.
Additionally, there is an excess sludge discharge stage, which is crucial for the continuous operation of the tank. Excess sludge is typically collected in a sludge storage tank where it undergoes decomposition, resulting in:
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Increased concentration of solids in the sludge
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Reduced organic content in the sludge, stabilizing it
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A significant reduction in sludge volume before further processing
The collected sludge is periodically treated, and the separated wastewater is returned to the equalization tank.
3. Nitrogen Removal Cycle in the SBR Tank
The nitrogen removal cycle in the SBR tank usually occurs in two stages:
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Nitrification Process: This occurs during the aeration phase of the SBR tank, involving two reactions: converting NH₄⁺ to NO₂⁻, and then NO₂⁻ to NO₃⁻. This process is driven by Nitrosomonas and Nitrobacter bacteria.
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Denitrification Process: In this stage, oxygen is removed from nitrites by bacteria in an anaerobic environment, marking the end of the nitrogen cycle. To ensure optimal system performance, dissolved oxygen should be maintained above 4 mg/L.
4. Advantages of the SBR Tank
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No sludge recirculation: Since the reactions occur in a single tank, there is minimal loss of active sludge.
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Easy integration of nitrification/denitrification and phosphorus removal processes:** This results in BOD removal efficiency of up to 90%.
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Suitable for wastewater with complex pollutant loads: Such as industrial wastewater, residential wastewater, hospital wastewater, and urban wastewater.
5. Where to Find a Supplier of SBR Wastewater Treatment Technology
Currently, many environmental companies offer SBR wastewater treatment systems. With extensive experience and high-quality equipment, Đại Nam Company is ready to provide you with the most suitable service. Their team of dedicated employees and engineers is committed to creating SBR wastewater treatment solutions that meet your specific needs.
