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Now-a-days industrial wastewater treatment has been a major preventive step against the pollution of natural water resources. This wastewater contains different type of contaminants and it needs prior treatment for its discharge in to water body. This study deals with the treatment of pesticide intermediate industrial wastewaters using individual treatment processes such as fenton, photo-fenton, electro-oxidation, rotavapor distillation, and coagulation. Optimization of operational parameters such as reaction time and fenton reagent dosages in fenton process, coagulant dosage in coagulation, inter-electrode distance, reaction time and pH in electro-oxidation process had been carried out in this study for the optimal reduction of chemical oxygen demand (COD). Using optimised dosages of fenton reagents FeSO 4 .7H 2 O of 0.1 g/l, H 2 O 2 of 1.75 g/l for 250 ml of sample (i.e. Fe +2 /H 2 O 2  = 0.050) in the fenton treatment of pesticide intermediate industrial wastewater an optimum COD. Removal of 51.1% was obtained at a reaction time of 180 min and at a pH of 3. Where as in photo-fenton process, an optimum COD removal of 53.33% was obtained at a reaction time of 180 min. Using rotavapor distillation, highest percentage removal of COD (62.22%) was obtained at a distillation temperature of 100 ℃. Graphic abstract

This study demonstrated a technique to regenerate spent activated carbon using solvent desorption followed by thermal decomposition of pollutants. Dichloromethane is used as solvent for desorption and thermal reactor under inert (N 2 , CO 2 ) atmosphere used for thermal reactivation of the spent carbon. Physical, chemical, functional chemistry and thermal behavior of the samples before and after treatment are featured by means of pH, bulk density, moisture content, ash content, Fourier transform infrared spectroscopy, thermo-gravimetric differential thermal analysis. The adsorptive property of the activated spent carbon is quantified using methylene blue and iodine as model compounds. After reactivation, methylene blue and iodine number adsorption is improved from 5 to 96 % and from 10 to 99 %, respectively. This regenerated carbon applied for paper mill and pharmaceutical effluents. 95 and 94 % of the COD reduction and color removal are observed by spent reactivated carbon.