FIn chemical and petrochemical production, water is more than a medium—it's a strategic challenge. Water management plays a central role in operational efficiency and environmental compliance, whether it's the volume of process water required, the contaminants carried in wastewater, or the risk of microbial growth in cooling systems.
And yet, many of the industry's legacy solutions—chemical dosing, energy-intensive treatment, and end-of-pipe reactive approaches—are becoming unsustainable. As the pressure to reduce chemical consumption, carbon emissions, and discharge loads increases, a growing number of facilities are turning to ozone as a modern alternative.
The Industry’s Evolving Challenges
Chemical manufacturers today face a convergence of technical and regulatory pressures:
- Wastewater from production processes often contains complex organic compounds, including phenols, solvents, and plasticisers, resulting in high COD (Chemical Oxygen Demand) values that frequently exceed discharge limits.
- Cooling towers and water circuits are prone to microbial contamination, including biofilm formation and Legionella proliferation, which compromise heat transfer efficiency and create health and safety risks.
- Cleaning-in-place (CIP) operations require aggressive chemicals—often acids and alkalis—resulting in high operational costs, hazardous waste generation, and increased water usage for rinsing.
- In some applications, colour and odour in intermediates or end products affect product quality, forcing additional treatment steps or product rejection.
- On top of all this, chemical producers are facing increasing pressure from regulators, investors, and clients to demonstrate compliance with ESG criteria, reduce emissions, and move toward circular resource management.
These issues are no longer future-facing—they are affecting day-to-day operations now. Facilities that fail to adapt may find themselves outpaced by competitors who embrace cleaner and more cost-effective technologies.
The Case for Ozone
Ozone (O₃) is a highly reactive molecule composed of three oxygen atoms. As one of the most powerful oxidants available, it has long been known for its disinfection capabilities, but its full potential in chemical manufacturing is only now recognised.
Unlike traditional chemicals, ozone:
- Rapidly breaks down complex organics, reducing COD and removing colour without leaving behind secondary pollutants.
- Disinfects water systems effectively, controlling bacteria, viruses, and biofilm without the long-term residue associated with chlorine-based compounds.
- Reacts quickly and decomposes into harmless oxygen, minimising the environmental footprint and eliminating the need for neutralisation.
- Can be generated on-site using only air and electricity, eliminating the need for transport and storage of hazardous chemicals.
These properties make ozone a strong candidate for improving both water treatment and process cleanliness, offering not just environmental benefits but also measurable operational savings.
Key Applications in Chemical Manufacturing
1. Wastewater Pre-Treatment
Before biological treatment, ozonation can significantly reduce the organic load in wastewater streams containing resistant compounds like phenols or solvents. This enhances the performance and stability of downstream biological systems, extends the lifespan of membranes in MBR setups, and helps facilities meet tightening discharge limits.
2. Cooling Water Management
Cooling towers are ideal breeding grounds for microbial growth, which leads to fouling, scale, and heat exchange inefficiencies. Ozone acts as a broad-spectrum disinfectant, preventing biofilm formation and controlling Legionella without the side effects of traditional biocides, such as chemical resistance or increased corrosion.
3. CIP (Clean-in-Place) System Optimisation
In cleaning processes, ozonated water can replace or complement traditional chemicals, allowing for shorter cleaning cycles, reduced rinse water volumes, and the elimination of chemical residues. This is particularly useful in facilities producing high-purity or sensitive formulations.
4. Product Quality Enhancement in Specific Processes
Beyond cleaning, ozone is beginning to play a role in the product stream itself. In some speciality chemical or plasticiser production lines, ozonation is used to remove unwanted colour or odour in intermediates—improving commercial value and reducing the need for costly downstream treatment.
A Practical Example: Colour Reduction in Plasticiser Production
In Turkey, certain manufacturers of plasticisers such as DOTP (Dioctyl Terephthalate) have adopted ozonation as part of their process to improve product quality. During production, intermediates can develop colour due to oxidation or side reactions, which affects the final product’s appearance and market value.
By introducing ozone—sometimes in combination with hydrogen peroxide in an AOP (Advanced Oxidation Process)—these manufacturers can break down chromophoric compounds responsible for unwanted colour. This not only increases product clarity but also reduces reliance on additional chemicals or filtration steps.
Such examples show that ozone is not just a utility—it can be a process enhancer with direct commercial benefits.
Why Now?
The timing for ozone adoption is no coincidence. The chemical industry is at a tipping point:
- Regulatory authorities are enforcing stricter limits on discharge quality and chemical usage.
- Supply chain partners and customers are demanding sustainable practices across operations.
- ESG reporting and net-zero goals are driving a reassessment of water and energy use.
Meanwhile, ozone systems have become more compact, affordable, and easier to integrate into existing facilities. Automation and monitoring capabilities now make ozone a viable, low-touch addition to even complex process environments.
Choosing ozone is no longer just a technical upgrade—it’s a strategic decision that supports compliance, operational resilience, and environmental leadership.
Let’s Talk About What Ozone Could Do for You
Whether you’re dealing with complex wastewater, struggling with cooling tower contamination, or simply looking to reduce chemical usage in cleaning systems, ozone may offer a more elegant and sustainable path forward.
If you work in the chemical or petrochemical sector and want to explore how ozone technologies could be applied to your facility, I’d be happy to discuss potential strategies or share real-world applications.