Effects of ozonation on disinfection byproduct formation and speciation during subsequent chlorination

Effects of ozone as a stand-alone and coagulation-aid treatment on the reduction of trihalomethanes precursors from high DOC and hardness water

“…Pryor et al (2002) have reported up to 25% TOC reduction at lower applied ozone doses of 0.3e0.5 mg Ozone/mg DOC. Also Can and Gurol (2003) and Mao et al (2014) have reported DOC reduction up to 20% achieved by ozonation in conventional treatment plants with ozone doses of 2e0.5 mg/L Joo et al (2002) has reported 16% TOC removal obtained at ozone range of 1e2 mg/L Galapate et al (2001) has achieved DOC removal ranging from 10 to 16%. Therefore, our reported DOC removals compare well with other published works.…”

Overview of the Main Disinfection Processes for Wastewater and Drinking Water Treatment Plants

“…It is believed that the degradation of the residual chlorine dioxide and other final reaction products is faster than that observed in the case of chlorine and therefore these compounds should not represent a hazard to the aquatic environment [45]. During the disinfection with ozone, the formation of organic (e.g., aldehydes, carboxylic acids, and ketones) and inorganic (e.g., bromate) disinfection by-products has been well documented [46][47][48][49][50][51][52][53]. Ozone does not cause the formation of chlorinated by-products such as trihalomethane, but recent studies indicate that ozone induce the formation of NDMA [54][55][56].…”

Research on Hydraulic Loom Wastewater Using the Combined Process Containing Coagulation- Ozonation- Flotation Treatment

“…In a typical process of water treatment for hydraulic loom wastewater is coagulation air floatation method [3]. Many studies have found that ozone can change the properties of suspended particles in the process of treatment, and then improve the removal efficiency of flocculation [4,5].…”

“…The characteristic of hydraulic loom wastewater is chemically complex and high-content of gel [2]. The hydraulic loom wastewater is moderate pollution wastewater, and with appropriate treatment, most of it can be recovery, which has important practical significance for reducing wastewater emissions and saving water resources.In a typical process of water treatment for hydraulic loom wastewater is coagulation air floatation method [3]. Many studies have found that ozone can change the properties of suspended particles in the process of treatment, and then improve the removal efficiency of flocculation [4,5].…”