Advanced Oxidation - Indirect Potable Reuse

The reuse of wastewater for augmentation of drinking water supplies (a process known as indirect potable reuse or IPR) is rapidly gaining support as a means of achieving a sustainable water supply and for protection against drought.

Indirect Potable Reuse process using microfiltration, reverse osmosis and UV-oxidation (UV and hydrogen peroxide).

Many contaminants, however, such as nitrosamines (e.g., NDMA), pharmaceuticals, endocrine disruptor chemicals, industrial solvents can pass through or are formed in traditional wastewater treatment plants, and are not fully removed by reverse osmosis membranes. These chemical contaminants must be removed before the water can safely be reused. Examples of contaminants potentially present in wastewater are:

Nitrosamines: The nitrosamines group consists of a large number of compounds formed by various combinations of amines and nitrogen compounds and having the foundational structure N-N=O. Perhaps the best known nitrosamine is N-nitrosodimethylamine (NDMA). Advanced treatment technologies such as reverse osmosis, carbon adsorption, ozone and air stripping are ineffective in treating NDMA. The NDMA molecule is considered to be carcinogenic at very low concentrations and is destroyed with ultraviolet (UV) light by a photochemical process known as UV-photolysis.

Pharmaceuticals, Personal Care Products (PPCPs), and Endocrine-Disruptor Compounds (EDCs): Until recently, PPCPs and EDCs were not viewed as potential environmental contaminants as their fate following use was not given significant consideration. However, with recent advances in analytical technology and a growing body of evidence of environmental impacts, this group of chemicals is coming under increasing scrutiny by water providers and regulatory agencies. As many of these contaminants are oxidizable, Trojan’s UV-Oxidation systems are capable of treating a wide variety of PPCPs and EDCs.

The Orange County Groundwater Replenishment System is the world's largest Indirect Potable Reuse system.

The Orange County Groundwater Replenishment System is the world’s largest IPR system. The recycled water is purified to a quality that surpasses most drinking water and is injected into aquifers for recharge and preventing seawater intrusion. This system provides the final treatment step after reverse osmosis to eliminate any remaining chemical or biological contaminants.

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Contact us at +1 (888) 220-6118, or email us today.

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