Continuous photocatalytic setup assisted with nano TiO2 plate for tannery waste water treatment

摘要

Novel photocatalytic continuous system for treatment of the tannery waste water has been proposed regarding to the concerns about their high environmental problems. The purification process was performed by passing wastewater on the TiO2-coated surface that continuously activated by irradiation of the UV-light. Moreover, in order to improve the yield of the process, FeCl3 was used as coagulation agent. The organic and inorganic compounds, as well as the microorganisms in the tannery waste water media have been degraded through photocatalytic process. The results revealed that total dissolved solids and total suspended solids contents were significantly decreased from 8,450 and 8,990 mg.L similar to 1 to 4,032 and 4,127 mg.L similar to 1, respectively. Furthermore, the chemical oxygen demand content of the sample was reduced from 370 to 50 mg.L similar to 1 after addition of 100 mL FeCl3 and 4 h of treatment. The same results were observed for elimination of the sulfate and chromium ions that led to decline of the sample electrical conductivity. As a consequence, introducing 100 ml of FeCl3 as coagulation agent and continuous treatment with photocatalityc set-up could be remarked as an effective method for purification of the tannery wastewaters.