The treatment of wastewater is integral to the protection of fresh water resources. Treatment uses a combination of mechanical, biological and chemical processes to remove particles and suspended solids, organic pollution, nitrogen and phosphorous. Mechanical processes comprise screening and sedimentation for solids removal, and biological treatment removes organic pollution and nitrogen. The remaining sewage sludge must be treated before disposal, but is also a source of energy via anaerobic digestion.

At Ovivo, we continually seek to formulate new methodologies to ensure extremely high levels of plant performance. We also work to develop and supply economic, efficient and environmentally friendly wastewater treatment technologies. Having considered the best technical solutions available, we can take full responsibility for supply, or provide equipment and solutions for the individual elements of wastewater treatment.

Ovivo is one of the world’s leading suppliers of high performance separation technologies for wastewater treatment, a position we attained this through resolute concentration on technical development of consistent, high quality outputs. As the demand for domestic water continues to rise, there is a growing need to find innovative and cost-effective recycling solutions. As a global developer and supplier of water and wastewater treatment technologies, we have a thorough understanding of the challenges inherent in municipal wastewater treatment, and continually strive to provide the most economic, environmentally friendly and effective process solutions for our municipal clients.

Sludge is an unavoidable end-product of the wastewater process, and its treatment and disposal is a significant consideration in the design of effluent treatment works across the world. A number of technologies are available to stabilize dewater and recover energy from sludge and selection of the most appropriate is dependent on a range of factors, including consideration of end-quality and routes of disposal. Ovivo is well placed to assist or advise on this.

Our wastewater management concepts are essentially based on combinations of different process solutions built from Ovivo’s key technologies- screens, clarifiers, biological treatment and membrane filtration - and combined with other world-class technologies within our portfolio. Using many decades of experience, we are committed to the development and supply of improved water treatment technologies.

With thousands of water industry installations worldwide, our experience and expertise enables us to add value to client processes by improving reliability and fulfilling environmental requirements.

Treatment of wastewater to achieve a final effluent quality suitable for safe discharge direct to a water course presents a variety of challenges. With over 100 years of combined experience in this market Ovivo has the expertise to offer practical, effective and cost-efficient solutions in all areas of your wastewater treatment plant.

Flow Diagram:

In-House Products

Primary or Preliminary treatment

Primary treatment covers the removal of bulk solids that could cause problems in the downstream biological processing step. It includes screening, and grit and grease removal and the removal of settlable solids.

Our primary treatments include:

• Headworks
• Screening & screening handling
• Grit removal & handling

Sedimentation

The design and manufacture of mechanical systems for sedimentation is one of Ovivo’s particular strengths. A large portion of our engineering capabilities are devoted to the design of gravity separation equipment, which is well known for its reliable low-speed, high torque drive mechanisms for sludge removal. Any unsightly floating scum which forms a blanket on the surface of settlement tanks is typically removed by surface blades to prevent problems in the downstream biological treatment process; surface blades guide the scum to a peripheral removal device.

The sedimentation processes we offer include:

• Circular clarifiers and thickeners
• Sedimentation drives
• Rectangular basins

Secondary Treatment

Secondary treatment removes dissolved and suspended biological matter, and is typically performed by indigenous, water-borne microorganisms in a managed habitat.

Attached Growth

Under this system, the biomass grows on a physical carrier within a film with oxygen supplied by natural exposure; this type of system is ideally suited to smaller, unmanned or part-manned works.

The processes we offer include:

• Trickling filter
• Rotating Biological Contractor (RBC)

Suspended Growth Systems

In these systems the biomass is mixed with the sewage and oxygen is supplied by external methods. Suspended growth systems occupy a smaller space than attached growth systems, and treat the same amount of wastewater. These activated sludge type systems can be developed to provide biological nutrient removal.

The processes we offer include:

• IFAS
• EWT™ FlooBed® MBBR Bioreactor
• Copa® HBNR

Clarification

Ovivo offers several methodologies to ensure rapid extraction of sludge. These include: duct type suction clarifiers which remove settled solids via a rotating suction header located at the bottom of the clarifier; pipe type suction clarifiers which deliver sludge to a central hopper or radial trough; logarithmic spiral blades which ensure sludge is quickly raked to a central header.

These include:

• Enhanced Clarification
• Tertiary Treatment
• Tertiary Filtration
• Disinfection

Membrane Bioreactors (MBR)

Membrane Bioreactors offer high quality, sanitary effluent in compact systems without the need for secondary clarification or tertiary treatment.

Sludge Treatment

Sludge from the primary and secondary sedimentations can be thickened prior to stabilization, while the remaining water is generally recycled as washwater.

These include:

• Aerobic Digestion
• Anaerobic Digestion

Sludge Dewatering

There are a number of methods for sludge dewatering including:

• Drying beds
• Filter Press
• Belt Press
• Centrifuge
• CINETIK® Linear Electro-Dewatering
  

Our Turnkey Capabilities

When it comes to water, being conservative makes good sense. From an initial evaluation of the best technical solutions through to commissioning and beyond, Ovivo can deliver a combination of wastewater treatment strategies that will save money and extract the maximum possible value from water.