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Submersible Mixer for Anoxic Tank
Submersible Mixer for Anoxic Tank are a vital part of the biological nutrient removal (BNR) process in wastewater treatment plants. These tanks provide an environment where denitrifying bacteria can convert nitrates into nitrogen gas, which is then released into the atmosphere. This process is cruci
Submersible Mixer for Anoxic Tank are a vital part of the biological nutrient removal (BNR) process in wastewater treatment plants. These tanks provide an environment where denitrifying bacteria can convert nitrates into nitrogen gas, which is then released into the atmosphere. This process is crucial for reducing nitrogen levels in treated wastewater, helping to prevent eutrophication in receiving water bodies.
The role of submersible mixers in anoxic tanks cannot be overstated. These devices are responsible for maintaining a uniform distribution of microorganisms, nutrients, and dissolved oxygen throughout the tank. Without proper mixing, 'dead zones' can form where the denitrification process is inefficient or non-existent, leading to reduced treatment effectiveness.
Submersible mixers ensure that the mixed liquor suspended solids (MLSS) remain in suspension, preventing settling and promoting contact between the microorganisms and the wastewater. This constant movement also helps to maintain the anoxic conditions necessary for denitrification by preventing surface aeration and keeping dissolved oxygen levels low.
Furthermore, efficient mixing in anoxic tanks can lead to significant energy savings. By optimizing the mixing process, treatment plants can reduce the energy required for pumping and recirculation, leading to lower operational costs and a smaller carbon footprint.
Model information sheet
Model | Rated power(KW) | Rated current(A) | Impeller Diameter(mm) | Speed(r/min) | Weight(kg) | Water pushing (N) | |
Casting Type | QJB0.85/8-260/3-740/C/S | 0.85 | 3.2 | 260 | 740 | 55 | 180 |
QJB1.5/6-260/3-980/C/S | 1.5 | 4 | 260 | 980 | 55 | 260 | |
QJB2.2/8-320/3-740/C/S | 2.2 | 5.9 | 320 | 740 | 110 | 580 | |
QJB4/6-320/3-980/C/S | 4 | 10.3 | 320 | 980 | 115 | 690 | |
Punch Type | QJB0.37/6-220/3-980/S | 0.37 | 1.5 | 220 | 980 | 40 | 138 |
QJB0.55/4-220/3-1450/S | 0.55 | 1.6 | 220 | 1450 | 40 | 145 | |
QJB0.85/8-260/3-740/S | 0.85 | 3.2 | 260 | 740 | 55 | 180 | |
QJB1.5/6-260/3-980/S | 1.5 | 4 | 260 | 980 | 55 | 260 | |
QJB1.5/8-400/3-740/S | 1.5 | 5.2 | 400 | 740 | 100 | 600 | |
QJB2.5/8-400/3-740/S | 2.5 | 7 | 400 | 740 | 100 | 800 | |
QJB3/8-400/3-740/S | 3 | 8.6 | 400 | 740 | 100 | 900 | |
QJB4/6-400/3-980/S | 4 | 10.3 | 400 | 980 | 100 | 1100 | |
QJB4/12-620/3-480/S | 4 | 14 | 620 | 480 | 184 | 1200 | |
QJB5/12-620/3-480/S | 5 | 18.2 | 620 | 480 | 184 | 1500 | |
QJB7.5/12-620/3-480/S | 7.5 | 28 | 620 | 480 | 229 | 1900 | |
QJB10/12-620/3-480/S | 10 | 32 | 620 | 480 | 229 | 2200 | |
QJB11/12-620/3-480/S | 11 | 34 | 620 | 480 | 229 | 2450 | |
QJB15/12-620/3-480/S | 15 | 42 | 620 | 480 | 250 | 3300 | |
QJB18.5/12-620/3-480/S | 18.5 | 55 | 620 | 480 | 270 | 3500 | |
QJB22/12-620/3-480/S | 22 | 65 | 620 | 480 | 290 | 3900 | |
Choose the appropriate submersible mixer for an anoxic tank
Selecting the right Submersible Mixer for Anoxic Tank involves considering several key factors:
Tank size and geometry: The dimensions and shape of the anoxic tank play a crucial role in determining the size and number of mixers required. Larger tanks or those with complex geometries may require multiple mixers to ensure complete mixing.
Mixing intensity: The required mixing intensity depends on the characteristics of the wastewater and the specific denitrification process. Generally, anoxic tanks require gentler mixing compared to aerobic tanks to maintain anoxic conditions.
Power consumption: Energy efficiency is a critical factor in mixer selection. Look for mixers with high thrust-to-power ratios to minimize energy costs while maintaining effective mixing.
Thrust: The thrust produced by the mixer is a key performance indicator. It should be sufficient to create the desired flow pattern within the tank without causing excessive turbulence.
Impeller design: Different impeller designs are suited for various applications. For anoxic tanks, low-speed, high-efficiency impellers are often preferred to minimize oxygen transfer while ensuring adequate mixing.
Materials of construction: Given the corrosive nature of wastewater, mixers should be constructed from materials resistant to corrosion and abrasion, such as stainless steel or specially coated alloys.
Maintenance requirements: Consider the ease of maintenance and availability of spare parts when selecting a mixer. Devices that can be easily lifted for inspection and maintenance can reduce downtime and maintenance costs.
Control options: Advanced control systems that allow for variable speed operation can help optimize mixing based on changing conditions in the tank, leading to improved efficiency and performance.
When sizing a submersible mixer for an anoxic tank, a common rule of thumb is to aim for a specific mixing energy of 5-10 W/m³ of tank volume. However, this can vary depending on the specific application and tank configuration.
Application Cases
Case Study 1: A municipal wastewater treatment plant in California upgraded its anoxic tanks with new submersible mixers. The plant replaced its old vertical mixers with modern Submersible Mixer for Anoxic Tank, resulting in a 30% reduction in energy consumption while maintaining the same level of treatment efficiency. The new mixers also provided better flexibility in adjusting mixing intensity based on varying influent conditions.
Case Study 2: A food processing facility in Germany implemented a BNR system with anoxic tanks as part of their wastewater treatment upgrade. They installed submersible mixers with variable frequency drives, allowing for precise control of mixing intensity. This resulted in optimized denitrification rates and a 25% reduction in total nitrogen in the effluent, helping the facility meet stringent discharge regulations.