The Bio-WheelTMbiological treatment system has been developed to combine the compactness and flexibility of the activated sludge process with the stability and simplicity of the fixed film process. The Bio-Wheel TMsystem integrates the two processes in a single tank by using a simple mechanical drive system. The rotation of the TM provides alternating air and water cycles for the fixed film process, and aeration and mixing for the activated sludge process.
With the Bio-WheelTM system, advanced water treatment with high quality effluent is possible by biodegradation of the organic compounds, nitrification, denitrification and uptake of excess P without using chemicals. The combination of the two processes provides high stability with low capital and operating costs.
Mixing & aeration produced from slowly rotating Bio-WheelsTM. No blowers are required. It has a small footprint, low power consumption and low cost. The only noise is cascading water.
Flow diagram
The heart of the wastewater treatment process is the Bio-WheelTM which consists of a rotating structure with cell plates* arranged in a series of rows. The cell plates are 3/4" apart and provide a roughened surface as media for fixed film growth, and also provide a source of aeration for the activated sludge. By adjusting the speed of rotation for varying oxygen requirements, treatment of the wastewater occurs both in the activated sludge and the fixed film.

During rotation of the Bio-WheelTM, trapped air is gradually released into the mixed liquor as fine bubble aeration. Some of the air is transferred from one pocket to another inside the cells providing additional buoyancy and reducing energy requirements. Before the cells are rotated to the surface, all air is expended as fine bubble diffusion. By this method, the time of retention of air-water contact is extended so that oxygen transfer is optimized.

The rotational speed of the Bio-WheelTM is adjustable, which regulates the amount of aeration and mixing in the bio-tank. The deep submergence of the wheel in the mixed liquor increases the efficiency of oxygen transfer.

High Process Efficiency
By combining activated sludge and fixed film processes into a single system, a much higher treatment efficiency is obtained.

Sturdy & Simple Construction
Bio-Wheel TM wheels are assembled at the construction site from sub-assemblies prepared at the factory. Through modular construction, it is possible to provide wheels of many different sizes to suit any given application.

Reliability of Operation
A high degree of flexibility and stability in the treatment process is possible due to the wide spectrum of fixed and suspended microorganisms combined with the ability to regulate oxygen intake. Temporary overloads can be buffered without problem.

Reduced Need for Space, Lower Cost to Build
High operating efficiency and compact design reduce space requirements as much as 40% over compatible systems. There is no yard piping, yard electrical or buildings to house equipment. Cost of construction is reduced due to the small size and simplicity of the system.

Reduced Power Consumption and Operating Cost Power consumption of the Bio-Wheel TM is less than 30% of other aerobic processes using blowers.

Advanced Wastewater Treatment
With the Bio-Wheel TM process, it is possible to achieve nitrification and denitrification, bringing BOD5, TSS and NTotal substantially below 10 mg/L, and reducing P to 1.0 mg/L or less.
plant treating landfill leachate at an EPA Superfund site. The influent is high in organic chemicals, particularly toluene and xylene.
No Annoying Odors, Low Noise Level
Through efficient oxygen transfer, air intake requirement is minimized. Most of the turbulence and mixing take place within the submerged aerator, minimizing the production of aerosols and emission odors. There are no blowers requiring dust control, silencers or protective covers.

Simple Control System
Sophisticated microprocessor controls are not required. Electrical panels are straight forward based on position switches and annunciator lights.

Optimum Consistency of the Sludge
The sludge settles well and has excellent dewatering characteristics due to the fixed film component of the system. The clarifier and sludge treatment facilities can be designed with less volume and be more compact. Waste sludge is greatly reduced in volume.
The Bio-Wheel TM is used for:
  • New wastewater treatment facilities as self contained and preassembled package plants.
  • New wastewater treatment facilities using cast-in-place or pre-cast concrete tanks.
  • Retrofit of existing plants to provide nitrification, denitrification and biological phosphorus removal.
  • Modernization of existing plants for increased flow capacity and reduced power consumption.
Applications include the following:
  • Treatment of domestic wastewater containing industrial and manufacturing wastes.
  • Treatment and pre-treatment of high strength organic industrial wastewater.
  • Combined with septic tanks and lagoons for improved nitrification, denitrification and biological phosphorus removal.
  • Treatment of liquid manure in hog farms, feedlots and animal processing facilities.
  • Aquaculture, including fish farming in closed circuit systems.
A 200,000 GPD Bio-WheelTM pre-treatment facility using eight (8) large wheels. The influent BOD5 is >1,000 mg/L and is reduced to <250 mg/L. The picture shows the plant under construction, ready to receive the polypropylene plates.
A 24,000 GPD Bio-WheelTM installation treating industrial and municipal wastewater. The influent loading is high in NH3-N due to the cleaning of glass in the manufacturing operation. Effluent limits are <10 mg/L for BOD5 and TSS, and <2 for NH3-N. The picture shows the facility ready for start-up, awaiting completion of siding on the building.