Solar photo-Fenton technology in conjunction with a sequential batch reactor for the degradation of textile dyeing effluent

The novelty of present work was employed steel scrap as a substitute for the conventional Fenton catalyst in the Fenton chemical process. It was experimented to determine the degradation of textile dyeing effluent using three different types of light: room light, ultraviolet light, and solar light. In order to fulfil the colour and COD degradation regulations, a sequential batch reactor (SBR) biological treatment was combined with a solar photovoltaic (PV) system using steel as the catalyst. Solar light intensity, catalyst reusability, effluent volume, kinetic study, and contact time were all factors that were investigated. Based on laboratory-scale feasibility experiments, the most effective catalyst dosage for solar photo-Fenton with steel scrap as the catalyst was 1 g/L, with an H 2 O 2 dosage of 132 Mm and a pH of 3. The maximum colour degradation efficiency was 99.7 percent, and the COD degradation efficiency was 73 percent. Aerobic biological treatment using a combination of solar photo-Fenton and steel scrap catalyst has successfully removed colour and COD like 99.8 percent and 91.1 percent respectively. The total cost of wastewater treatment by coupled treatment processes was Rs 726/m 3 of textile dyeing wastewaters. In a textile dyeing industry at Thirupur the treatment cost of textile dyeing effluent is Rs 812/m 3 .There is 10% cost reduction. For an industry treating 20 m 3 /d, the savings in cost amount to Rs 1600 daily.