Technology of MBBR domestic wastewater treatment
Date public: 21-06-2024||View: 3779
Wastewater treatment technology MBBR is an advanced technology in wastewater treatment in recent times. This technology is developed based on the traditional Aerotank technology, with advantages in enhancing the treatment efficiency of nitrogen, phosphorus, ammonium, etc., making it widely used in wastewater treatment projects.
1. Information about MBBR Wastewater Treatment Technology
MBBR stands for Moving Bed Biofilm Reactor, a technology that applies activated sludge and microbiological techniques. Microorganisms utilize carriers to adhere and move within the wastewater.
MBBR Domestic Wastewater Treatment Technology
In the MBBR tank, the carriers move freely throughout the system, driven by the air blower's activity. Thanks to these auxiliary activities, the density of microorganisms continuously increases, leading to high treatment efficiency.
2. What are the Advantages of MBBR Wastewater Treatment Technology?
This technology combines the advantages of activated sludge and biofilm processes by using free-moving carriers to achieve the desired microorganism density.
MBBR has the following advantages:
MBBR Domestic Wastewater Treatment Technology
3. What Conditions are Required to Apply MBBR Wastewater Treatment Technology?
When using this method, you need to consider: biofilm, flow structure, air supply system, and the properties and quantity of carriers.
3.1. Biofilm
Biofilm is considered the "home" of microorganisms, protecting them from negative impacts from pollutants, disinfectants, etc. The main components of biofilm are extracellular polysaccharides or extracellular polymeric substances (EPS) that surround the cells and account for nearly 90% of the polymers covering the membrane.
MBBR Domestic Wastewater Treatment Technology
In MBBR wastewater treatment technology, microorganisms within the biofilm are affected by temperature, pH, and flow rate.
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Temperature affects the nutrient absorption and adhesion capacity of microorganisms. Some studies show that at lower temperatures, bacterial adhesion to the carrier surface increases.
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The optimal pH for bacteria is 7.0.
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High flow rates reduce the likelihood of biofilm detachment.
Moreover, maintaining the thickness of the biofilm in MBBR wastewater treatment technology plays a decisive role in the proper operation of the entire system. Failing to maintain the biofilm thickness can lead to aging and membrane detachment.
3.2. Flow Structure
In MBBR wastewater treatment technology, flow is typically divided into two types: counter-current flow and co-current flow.
Currently, MBBR tanks commonly use co-current flow in the same direction as the air system. Co-current flow offers better carrier suspension and improved operation.
3.3. Air Supply System in MBBR Wastewater Treatment Technology
At the air blowers, the air must be evenly distributed across the biofilm. This even distribution ensures stable carrier movement within the MBBR tank. Recently, to prevent sludge settling in MBBR wastewater treatment technology, small bubble diffusers are often recommended and used.
3.4. Properties and Quantity of Carriers
To remain suspended in water, the carriers need to have a lower density than water. The average carrier volume should be <50% of the tank volume. Depending on the wastewater flow and pollution level, you should select carriers with different properties, such as surface area, porosity, absorbency, size, etc.
MBBR Carriers for Domestic Wastewater Treatment
Currently, carriers come in many forms, such as polyethylene, polyvinyl alcohol gels, granular activated carbon, foam polymers, etc. Most of these are suitable for MBBR wastewater treatment technology. Biofilm formation can develop on most materials. Among them, polyethylene provides the ability to remove about 94.96% of COD, 99.07% of BOD, and 87.32% of TOC (Adabju, 2013). Zhang et al. (2016) and Deng et al. (2016) show that foam polymers can remove COD (97.52 ± 1.63%) and NH4+- N (95.3 ± 4.6%) (Reference information from the Internet).
The quantity of carriers in MBBR wastewater treatment technology represents the surface area of the biofilm. This ratio can be understood as the surface adhesion ratio of the biofilm, which is determined by the membrane's thickness and size.
However, while this is considered a fairly good wastewater treatment technology, it still has some drawbacks. To overcome these shortcomings, Dai Nam always commits to bringing you the best solutions.
Explore more effective technologies than MBBR wastewater treatment technology here.
For further information and free consultation, please contact Dai Nam Environmental Solutions Co., Ltd.
