Optimization by uniform design U8(83) approach for enhanced caffeine degradation in synthetic wastewater in bioreactor

Abstract

Significance and Impact of the Study: Caffeine degradation in coffee wastewater is crucial but less explored area in current treatment strategies. This research focus on the caffeine degradation in a reactor where we used uniform design methodology and mathematical model derived from its data. Experimental design yielded a highest caffeine degradation of 23Á59 mg L −1 h −1 at 0Á3 g L −1 biomass, 200 rev min −1 and 1Á8 vvm which is highest ever reported along with reduction of critical parameters like COD, BOD and TOC. Regression model developed from experimental data predicted an optimum caffeine degradation rate of 24Á2 mg L −1 h −1 at 0Á35 g L −1 , 395 rev min −1 and 1Á62 vvm which was confirmed experimentally.