The MBBR (Moving Bed Biofilm Reactor) suspended granular bio-filler is a high-efficiency biological carrier specifically designed for advanced biofilm treatment processes by our company. Through optimized structure and material design, this product provides a vast effective specific surface area for microbial attachment and growth. Under aeration or agitation, the biofilm freely flows within the reactor, enabling efficient contact and degradation of pollutants. This enhances the system's treatment capacity, stability, and operational flexibility.
- Structure and Working Principle
- Core Structure Design
The filler consists of specially engineered regular particles, with core design features including:
- Geometric configuration: typically a short cylinder, hollow cube, or polyhedron, containing complex intersecting grids, ribs, or honeycomb structures to maximize the protected internal surface area.
- Surface properties: The surface is physically or chemically modified to exhibit a rough micro-texture and hydrophilicity, designed to facilitate initial microbial attachment and biofilm formation.
- Material and Density: The main body is made of engineering plastics such as high-density polyethylene (HDPE) or polypropylene (PP). Through internal structural design, its wet density is precisely controlled to be slightly lower than water (typically 0.94-0.99 g/cm³), ensuring optimal suspension and fluidization performance.
- Working Principle
The packing material is introduced into the MBBR reactor at a specific filling ratio (typically 20%-70% of the reactor volume).
- Biofilm carrier: Microorganisms adhere to the protected surface area inside and outside the packing material, forming a stable biofilm. The reactor simultaneously contains attached biofilm and suspended activated sludge, creating a composite treatment system.
- Fluidization and mixing: Driven by the bottom aeration system, the packing material circulates uniformly and randomly within the reactor with the water flow, achieving thorough mixing and contact between the biofilm, wastewater, and air.
- Self-renewal: The gentle collision and friction between the fillers help control the thickness of the biofilm, promote the shedding of aged biofilm, and maintain the high activity of the biofilm.
- Core technical features
- Efficient mass transfer and treatment load: The continuous motion of the packing material breaks the water film resistance, enhancing the mass transfer process. The high biomass concentration in the system typically results in a higher volumetric loading than conventional activated sludge processes, making it suitable for high-concentration wastewater or projects with limited land availability.
- Process simplification and operational stability: The filler serves as a immobilized carrier for microorganisms, eliminating the need for sludge recirculation. The sedimentation characteristics of sludge have minimal impact on the system, and the operation and management are relatively straightforward. The biofilm system demonstrates relatively strong tolerance to water quality fluctuations.
- Flexibility and Scalability: By adjusting the filler ratio, the system's processing capacity can be flexibly regulated within a certain range, facilitating subsequent expansion and upgrades. This process also enables the retrofitting of existing wastewater treatment facilities to meet higher standards.
- No clogging and low wear: The special internal flow channel design and fluidized motion pattern effectively prevent clogging issues. The selected materials and structure ensure mechanical durability during long-term cyclic operation.
- Synchronous nitrification-denitrification potential: In a single reactor, anoxic/anoxic microenvironments may form within the packing material, creating conditions for synchronous nitrification-denitrification and simplifying the nitrogen removal process.
- Main technical parameters
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Parameter item
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Description / Typical range example
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Shape and size
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Common shapes: cylindrical (Φ10×10mm, Φ25×12mm, etc.)
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effective specific surface area
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Depending on the model, the range is typically 300 – 1200 m²/m³ (based on bulk volume)
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stacking density
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Approximately 110–160 kg/m³ (dry weight)
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wet density
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0.94 – 0.99 g/cm³, ensuring good suspension
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material quality
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High-density polyethylene (HDPE), polypropylene (PP), containing UV-resistant and anti-aging additives
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filling rate
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The design filling ratio is typically 20% to 70% of the reactor's effective volume.
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applicable temperature
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The recommended operating water temperature range is typically-35 to 65°C.
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- Typical Application Fields
MBBR media and its process are suitable for various new and retrofit water treatment projects, particularly for:
- Municipal wastewater treatment: Upgrading of domestic sewage treatment plants (enhanced nitrogen and phosphorus removal), capacity expansion, and compact integrated wastewater treatment systems.
- Industrial wastewater treatment: treatment of high-concentration, refractory organic wastewater from food, brewing, pharmaceutical, chemical, and papermaking industries.
- High ammonia nitrogen wastewater treatment: nitrification units for landfill leachate, aquaculture wastewater, coking wastewater, etc.
- Micro-polluted water purification: ecological restoration and water quality improvement projects for rivers, lakes, and other surface water bodies.
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