Comprehensive reference for dispersed suspended packing and the many spherical suspended packing variants, with structure, characteristics and parameter tables.
← Back to Suspended Ball MediaSeveral types of dispersed suspended packing are available, made mainly from plastic and fibre materials with a wide variety of shapes, including hollow balls, cascade rings, Raschig rings, Pall rings and suspended particles.
Advantages: low residual sludge, good removal of refractory substances, efficient nitrogen and phosphorus removal and interception of suspended solids; no fixing or hanging required, easy to use and replace, reducing installation and operating workload. The drawback is that design and commissioning demand more attention.
Spherical suspended packing (porous rotating spherical suspended packing) is injection-moulded from polypropylene with several regular or irregular cavities inside, keeping dynamic equilibrium in water. Strong biomass adhesion, large specific surface area, high porosity, stable chemical and biological properties, durability, no harmful release, UV and ageing resistance and strong hydrophilicity.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ55 | ≈6100 | On request | 0.92 | On request |
| Φ60 | ≈4700 | On request | 0.92 | On request |
| Φ80 | 2000 | 800 | 0.92 | 28 |
| Φ100 | 1000 | 700 | 0.92 | 23 |
| Φ150 | 350 | 380 | 0.92 | 85 |
Quantity per m³ is calculated from the packing-volume (1/d³) relationship, anchored to the reference values Φ150=350, Φ100=1000, Φ80=2000 pcs/m³. Relative density 0.92 is the reference value. Surface area and unit mass for Φ55/Φ60 are not yet confirmed — marked On request rather than invented; confirm before quoting.
Light and regular, moulded from polypropylene, with stiffening ribs and concentric radiating structure — high air velocity, large blade and diameter, high specific surface area, and wide use for defluorination, decarburization and CO₂ removal. Typical parameters — Table 2-10.
| Size / mm | Surface area / m²/m³ | Number / pcs per m³ | Packing density / kg/m³ |
|---|---|---|---|
| 25 | 500 | 85000 | 210 |
| 38 | 300 | 22800 | 100 |
| 50 | 200 | 11500 | 95 |
| 76 | 150 | 8500 | 95 |
Made from two half-spheres of PP, PE, PVC, CPVC or PVDF, with a high void ratio; packing density 58–60 kg/m³, specific surface area 136–155 m²/m³, about 1480 pcs/m³, in Φ100/76/50/25 mm. Used in sewage plant and factory waste-gas treatment.
Surface with film and internal spiral thread; large specific surface area, effective bubble cutting, higher oxygen-use efficiency, fast film formation and good treatment. Parameter — Table 2-11.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ150 | 350 | 380 | 0.92 | 85 |
Inner core pressed into a double large plastic ring with acetal fibre or polyester filament pressed around it, and snow-flake plastic branches; supports biofilm, cuts bubbles and raises oxygen transfer. Parameter — Table 2-12.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ150 | 350 | 380 | 0.92 | 38 |
Elastic filaments in a radial pattern on the sphere, giving full contact of gas, water and biofilm; uniform biofilm, self-renewing metabolism, no agglomeration, strong-bed cutting capacity, high space utilization and no dead zones. Parameter — Table 2-13.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ150 | 350 | 380 | 0.92 | 36 |
Filled with a bundle of plastic or polyester filaments; large specific surface area, fast film formation and good treatment. Parameter — Table 2-14.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ70 | 1000 | 700 | 0.92 | 13 |
| Φ100 | 1000 | 700 | 0.92 | 23 |
| Φ150 | 2000 | 800 | 0.92 | 12 |
Fibre filaments tied into balls; acid- and alkali-resistant, elastic, compressible, high porosity, strong biofilm and dirt-holding, good organic removal — an ideal media for biological wastewater treatment. Parameter — Table 2-15.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ80 | 2000 | 800 | 0.92 | 28 |
Inner core of sponge filaments; flexible, compressible, high porosity, good biofilm and dirt-holding. Parameter — Table 2-16.
| Size / mm | Number / pcs per m³ | Surface area / m²/m³ | Relative density | Unit mass / g |
|---|---|---|---|---|
| Φ80 | 2000 | 800 | 0.92 | 12 |
PE or PP, with an outer hollow mesh ball and an inner transformation-sphere body; easy biofilm formation and replacement, acid- and alkali-resistant, anti-ageing, long life and very low residual sludge. Widely used for domestic sewage, petrochemical, light papermaking, food, brewing, textile printing and pharmaceutical wastewater. Parameter — Table 2-17.
| Structure / size | Surface area / m²/m³ | Porosity ≥ % | Relative density | Number / pcs per m³ |
|---|---|---|---|---|
| Double-layer Φ150 | 380 | 97 | 0.92 | 350 |
| Spherical Φ100 | 700 | 96 | 0.92 | 1000 |
| Spherical Φ80 | 800 | 95 | 0.92 | 2000 |
Based on the "flow-dispersed" phenomenon — solids and organic matter in water gathering where flow is fast and slow — the XZFSBBR bio flow-dispersed technology uses a special porous mineral and plastic outer shell with granular filling. Advantages include simple operation, low energy, simple management, strong water distribution, high dissolved COD removal, easy hanging and stripping of biofilm, no sludge flushing tank needed, small footprint, long service life and very low secondary pollution; suitable for domestic sewage, industrial wastewater and biological deodorization, with a biological loading above 35 g/L.
Made from high-quality polyester filaments tied into balls; large dirt-holding capacity, good filtration, renewable — for advanced and fine filtration. Parameter — Table 2-18.
| Item | Value | Item | Value |
|---|---|---|---|
| Density | 1.38 g/cm³ | Dirt-holding capacity | 6–10 kg/m³ |
| Filling density | 75–85 kg/m³ | Ball diameter | 30–40, 40–50 mm |
| Filtration rate | 20–85 m/h | Appearance | White spherical / elliptical |
| Porosity | 92–96% | Specific surface area | 3000 m²/m³ |
SNP suspended bio packing uses a novel structure of fibre ball, mesh shell, through-hole porous column or spherical packing. It avoids fixed installation, maintenance and clogging while overcoming the disadvantages of quartz sand and ceramsite; a unique aerobic/anaerobic zone, large specific surface area, high porosity, strong attached biomass and high hydrophilicity give good mass transfer and effective nitrogen, phosphorus and COD removal in industrial and municipal wastewater.
Made of photo-cured polyurethane resin. Large specific surface area, high mechanical strength, can run at high agitation; chemically stable and not easily decomposed, spherical with low wear, long storage. Diameter 3.4–5.5 mm (standard 4.2 mm ± 0.1 mm), relative density 1.004–1.070 (standard 1.02, close to water), strong hydrophilicity and surface charge for easy microbial attachment; used in industrial and domestic wastewater treatment.
The Raschig ring, introduced by F. Raschig in 1914, is a hollow cylinder with an outer diameter equal to its height, made from ceramics, metal or plastic. Widely used for industrial wastewater, domestic sewage and even leachate treatment.