High-load organic wastewater dark fermentation biohydrogen production device and hydrogen production method

A organic wastewater dark fermentation biohydrogen production device, comprising:

• a dark fermentation biohydrogen production device (7), a two-phase separation device (12), a gas buffer tank (24) and a hydrogen storage tank (26), wherein;
• an organic wastewater is used as a fermentation substrate in the dark fermentation biohydrogen production device (7);
• an exhaust port located at a top of the dark fermentation biohydrogen production device (7) is in fluid communication with a gas collection region (22) through a gas collection pipe (8);
• and
• a return inlet is arranged at a bottom of the dark fermentation biohydrogen production device (7);
• a water inlet is arranged at a side wall of the two-phase separation device (12);
• a first end of a inlet pipe (9) is connected with a liquid outlet of the dark fermentation biohydrogen production device (7), and a second end of the inlet pipe (9) is connected with the water inlet of the two-phase separation device (12);
• a baffle plate (10) is arranged in the two-phase separation device (12), wherein the baffle plate (10) is provided with a plurality of ultrasonic generators (10-1), and the baffle plate (10) has a helical shape that makes influent water form a helical centripetal water flow path;
• a return outlet (15) is arranged at the center of a bottom plate of the two-phase separation device (12);
• the return outlet (15) is fluid communication with the return inlet of the dark fermentation biohydrogen production device (7) through a sludge return pipeline (16);
• an air intake disc (13) is arranged below the baffle plate (10);
• a connecting pipe (14) located at a top of the two-phase separation device (12) is in fluid communication with the gas collection region (22);
• a first end of an inert gas pipe (20) is connected with an air hole at a bottom of the gas collection region (22), wherein a mist catcher (11) is arranged at a bottom of the connecting pipe (14), and a second end of the inert gas pipe (20) is in fluid communication with the air intake disc (13);
• and the inert gas pipe (20) is provided with a connecting inlet (21) and an air pump (19);
• and
• a hydrogen outlet at a top of the gas collection region (22) is connected with the air inlet of the gas buffer tank (24) through a first air delivery pipe (23), and an air outlet of the gas buffer tank (24) is connected with an inlet of the hydrogen storage tank (26) through a second air delivery pipe.