This study examined the effectiveness of an ozone (O3) system from an existing livestock wastewater treatment plant installed with a dissolved O3 flotation unit and suggested a method for future improvement in terms of an effective removal of recalcitrant organic substances. An optimum O3 dose was proposed by selecting an O3 dose yielding a maximum value of biochemical oxygen demand/chemical oxygen demand (BOD5/CODMn). The peroxone (O3/H2O2) process was found to be no different of efficiency from the O3 alone process due to the high alkaline content of the wastewater in which all hydroxyl radicals (OH•) are scavenged. In this study, an electrochemical process was found to be promising in decreasing the recalcitrant organic substances and the removal efficiency of them was not affected by the timing of ozonation, i.e., as a final step.
Bibliographical noteFunding Information:
This work is supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2016R1A2B4015598), “Eco process based technology (code 2017000150003)”, and “Development of water harvesting techniques for multipurpose water supply in the island area (code 201805207)” funded by Korea Environmental Industry & Technology Institute.
All Science Journal Classification (ASJC) codes
- Water Science and Technology
- Ocean Engineering