Air Products South Africa has unveiled its new oxygen (O2) based technologies, which provide effective solutions to increase treatment capacity of existing water treatment plants.

The Tier One gas supplier has introduced a number of technologies to address waste water treatment issues to the global industry, namely O2 and ozone developments.

It has unveiled the oxy-Dep® - a biological waste water treatment process which uses pure O2 instead of air, to help combat biological oxygen demand (BOD).

Oxy-Dep offers treatment plants an efficient O2 dissolution system, which incorporates a side-stream injector to deliver O2 in the form of very fine bubbles to an activated sludge process, whilst maintaining minimal power consumption.

The use of O2-based technology eliminates wasted energy in terms of separating O2 from nitrogen (N2) in normal aeration processes, and using high purity (HP) O2 achieves faster O2 mass transfer rates in water than air.

“This is a highly cost-effective alternative to expanding an existing plant’s infrastructure. Treatment methods that use oxygen-based technology to purify and neutralise waste water are gaining popularity in the industry.”

Additionally, HP O2 can be used in waste water treatment facilities when aeration basins reach their load limit, as it can boost the capacity of the basin in the short term. Sachin Kulkarni, National Sales Manager of Bulk at Air Products South Africa, explains, “This is a highly cost-effective alternative to expanding an existing plant’s infrastructure. Treatment methods that use oxygen-based technology to purify and neutralise waste water are gaining popularity in the industry.”

Other specialist solutions offered by Air Products for waste water-related problems include ozone technology, which the company also provides for cyanide destruction in the mining industry, and carbon dioxide (CO2), which the company supplies to water-treatment companies for pH balancing.

Kulkarni went on to say, “Waste water technologies must have economic benefits to the company, in other words they must be cost-effective in addition to being environmentally-friendly. Air Products is continually looking for ways in which to optimise waste water treatment facilities through improved oxygen-based technologies which bring direct benefits to the user.”

“Although oxy-Dep provides recognised benefits when compared to conventional aeration methods, it is not the final word in waste water treatment. Air Products is making ongoing advances in the field through its research and development efforts, to gain a deeper understanding of the role of oxygen in the biological and water treatment process. “

This advancement helps toward the worldwide adoption of zero liquid discharge (ZLD), which encourages industries to adopt waste water technologies to help towards water recycling and reducing water wastage.