Evaluation of treatment effectiveness of fanton process and laser beam on urban wastewater treatment plant effluent

In this thesis, removal of COD from treated urban wastewater treatment plant (UWWTP) using fenton process and fiber laser irradiation is investigated. Urban wastewater treatment plant effluent was set to pH 3 for Fenton process 0,25 gr FeSO4 and 0.08 ml H2O2, was used to remove chemical oxygen demand (COD-mg/L). COD Treatment efficiencies between 9,52 - 28,57% were obtained. For laser irradiations Flast-NanoMark fiber laser system with 20 W, 40 Khz, 500 mm/s was used. Change in COD (mg/l) values were measured during laser irradiation in 60 minute time interval. No pH adjustment was made in the urban waste treatment plant effluent. Although COD value fluctuations were observed in the studies which were carried out with the Flast-Nanomark fiber laser system a %4, to % 28 removal efficiencies were obtained. The fluctuations in the value of COD were attributed to the decomposition of nondegradable organic materials in wastewater by laser beams. In this thesis, fenton process was used in order to re-treat wastewater for specific pollutants in the wastewater treatment plant effluent. The Fenton process applied to the treatment plant effluent did not contribute much to the effluent quality in terms of the COD. In control parameters of the laser system such as temperature, surface area, volume, power, frequency, speed, pulse width and wavelength were determined to be consideration during laser process design. The use of laser beams at different stages of the wastewater treatment plant will positively affect the efficiency of the treatment process. As a result of this study, it was determined that dissolved iron or other chemicals can be used as catalysts during laser irradiation.