“…In studies where specific bacteria were preferred for hydrogen production, Clostridium species were generally used. The raw materials and bacteria used included glucose monohydrate and Clostridium butyricum CWBI1009 [ 57 ], food waste and Clostridium butyricum [ 58 ], non-sterile food waste and Clostridium butyricum TISTR 1032 [ 59 ], vine shoots and Clostridium butyricum [ 60 ], glucose and molasses and Clostridium butyricum TM-9A [ 61 ], and tequila vinasses and Ethanoligenens harbinense and Clostridium tyrobutyricum [ 62 ]. The majority of hydrogen-producing bacteria can grow in wide pH ranges.…”