Ozone-Based Process for Industrial Wastewater COD Reduction

The chemical oxygen demand (COD) removal rate for industrial wastewater is higher than 95 percent, when using high ozone (oxidants) dosages, according to a study by ESCO International.

The company, which specializes in UV, ozone and advanced oxidation wastewater treatment processes for industrial, municipal and commercial use, says ozone-based advanced oxidation technology can help lower capital and operating expenses.

Its pilot study looked at ozone-based advanced oxidation processes — cost-effective alternatives to traditional chemical treatment for COD and biological oxygen demand (BOD) removal that do not produce sludge.

The results indicate that the primary control parameters for COD and BOD removal using ozone based-AOP are dosage, contact time and pH, the company says. As the ozone (oxidants) dose is increased, carbon-carbon single bonds are attacked and broken, resulting in a loss of COD, BOD and TOC. At stoichiometric ozone (oxidants) dosages, COD removal rate is higher than 95 percent.

Bridgnorth Aluminium, which makes aluminum products for the lithographic industry, says its new onsite effluent treatment plant, Camlab’s Mantech PeCOD system, paid for itself in three months and continues to save the company money.

Bridgnorth Aluminium wanted to reduce its water discharge, comply with water authority consents, increase onsite water recycling, and optimize chemical treatment of all wastewater, while saving money from all of these actions.