Additional file 1 of Maximizing biohydrogen production from watermelon peels using Clostridium butyricum NE133: a statistical optimization approach with Plackett–Burman and Box–Behnken designs

Additional file 1: Table S1. Physicochemical composition of WMP. Fig. S2. A designed hydrogen production system using water displacement method. Fig. S3. GC–MS analysis of pretreated WMP control medium before fermentation. Fig. S4. GC–MS analysis of optimized WMP spent medium after fermentation