The UV/H2O2 process has often been proposed as an effective treatment technology for remediation of colored wastewaters. However, it has frequently been noted that it is not as economically efficient as other treatment technologies. To limit this drawback as much as possible, an effort to optimize the treatment technology from both the economical and operating points of view is needed. This work presents a study on determination of cost optimal operating conditions for decoloration and mineralization of C. I. Reactive Blue 268 by the UV/H2O2 process. Dye concentration, hydrogen peroxide concentration, pH, treatment time, and temperature were considered to be influential operating parameters. Cost of electricity, cost of hydrogen peroxide, and cost of water needed to adjust the dye concentration were considered to be relevant operating costs. The presented approach is based on response surface methodology in conjunction with mathematical programming. The results obtained clearly indicate that, in order to assure effective and economically efficient operation, the UV/H2O2 process should be simultaneously optimized from the perspective of both operational and economic efficiency.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 14985238Many processes have been proposed as an effective treatment technology for remediation of colored wastewaters. However, it has frequently been noted that some of them are economically unacceptable due to high operating cost. This thesis provides studies on approaches to determine cost-effective decoloration and mineralization of C. I. Reactive Blue 268 using advanced treatment technologies. First, the results of laboratory experiments and mathematical models of UV/H2O2 and Fe2+/H2O2 processes are presented. The results indicate that the processes can be modeled in a sufficient way by using the response surface methodology. Second, a study on optimization of an energy intensive UV/H2O2 process is presented. Dye concentration, hydrogen peroxide concentration, pH, treatment time, and temperature were considered to be influential operating parameters. Cost of electricity, cost of hydrogen peroxide, and cost of water needed to adjust the dye concentration were considered to be relevant operating costs. Although the minimal treatment cost were estimated to 17 /m3, the results obtained clearly indicate that, in order to assure effective and economically efficient operation any given process should be simultaneously optimized from the perspective of both operational and economic efficiency. The latter can, however, be improved further by integration of advanced treatment technologies. UV/H2O2, Fe2+/H2O2 and membrane filtration were considered as alternatives for the integrated system. The integrated process flow sheet and values of operating parameters yielding minimal operating cost were determined. The results indicate that for the system studied significant reduction in average treatment cost can be achieved by proper integration of the denoted alternatives. Compared to the treatment cost of UV/H2O2, the estimated average treatment cost of an integrated system is approximately 75 % lower (2,4 /m3).
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 257975296