Peracetic acid-based advanced oxidation processes for decontamination and disinfection of water: A review.

Peracetic acid (PAA) has attracted growing attention as an alternative oxidant and disinfectant in wastewater treatment due to the increased demand to reduce chlorine usage and control disinfection byproducts (DBPs). These applications have stimulated new investigations on PAA-based advanced oxidation processes (AOPs), which can enhance water disinfection and remove micropollutants. The purpose of this review is to conduct a comprehensive analysis of scientific information and experimental data reported in recent years on the applications of PAA-based AOPs for the removal of chemical and microbiological micropollutants from water and wastewater. Various methods of PAA activation, including the supply of external energy and metal/metal-free catalysts, as well as their activation mechanisms are discussed. Then, a review on the usage of PAA-based AOPs for contaminant degradation is given. The degradation mechanisms of organic compounds and the influence of the controlling parameters of PAA-based treatment systems are summarized and discussed. Concurrently, the application of PAA-based AOPs for water disinfection and the related mechanisms of microorganism inactivation are also reviewed. Since combining UV light with PAA is the most commonly investigated PAA-based AOP for simultaneous pathogen inactivation and micropollutant oxidation, we have also focused on PAA microbial inactivation kinetics, together with the effects of key experimental parameters on the process. Moreover, we have discussed the advantages and disadvantages of UV/PAA as an AOP against the well-known and established UV/H2O2. Finally, the knowledge gaps, challenges, and new opportunities for research in this field are discussed. This critical review will facilitate an in-depth understanding of the PAA-based AOPs for water and wastewater treatment and provide useful perspectives for future research and development for PAA-based technologies.

[Characteristics of Disinfection By-products and Genotoxicity During Drinking Water Disinfection with Potassium Monopersulfate Compound Powder].

The qualitative analysis for by-products in the course of disinfection of the raw water and the effluent of GAC in Beijing Tiancuishan Drinking Water Treamtment Plant by potassium monopersulfate compound powder was determined. Halogen disinfection by-products during disinfection process by potassium monopersulfate compound powder was evaluated in a bench scale by comparing with chlorine disinfection process, and the genotoxicity evaluation of potassium monopersulfate compound powder and chlorine disinfection processes was also conducted by umu-test. The results showed that there were small changes in the organic pollutant components of water samples after disinfection by potassium monopersulfate compound powder, while some new halogen disinfection by-products were generated. Disinfection with potassium monopersulfate compound powder generated much less trihalomethanes (THMs) and haloacetic acids (HAAs) than chlorination disinfection. Moreover, the results of umu test indicated that the raw water and the effluent of GAC presented lower genotoxicity after potassium monopersulfate compound powder disinfection than chlorine disinfection. However, there was a risk for safety at a high level of organic matters and disinfectant dosage during potassium monopersulfate compound powder disinfection process.