JP2003305328A5 - - Google Patents

Claims (11)

A digestion gas generated by methane fermentation of organic waste is introduced, a reaction tower filled with a filler to which microorganisms adhere, an air supply means for supplying air to the digestion gas before introduction into the reaction tower, and introduction In the digestion gas desulfurization apparatus equipped with a spray nozzle for spraying water to the later digestion gas,
The filler is packed without being fixed on a porous plate-like support member provided in the reaction tower, and the digestion gas inlet is provided downward at the top of the reaction tower. A digester gas desulfurization unit. The digester gas desulfurization apparatus according to claim 1 , wherein the filler is a synthetic resin body having a specific gravity of 0.9 to 1.05 and a void of 80 to 95% by volume ratio .   A sensor for measuring the pressure loss of the digestion gas flowing through the reaction tower, and when the measured value is input and exceeds a prestored pressure loss threshold value, commands to stop introducing the digestion gas into the reaction tower The digester gas desulfurization apparatus according to claim 1, further comprising: an arithmetic unit that outputs a signal and / or an alarm.   The digester gas desulfurization apparatus according to any one of claims 1 to 3, wherein a heating device is provided in a tower wall, a circulating water pipe, or a circulating water pool at the bottom of the reaction tower.   Hydrogen sulfide contained in the digestion gas by introducing the digestion gas generated by methane fermentation of organic waste into the reaction tower packed with the packing material to which microorganisms adhere, after adding air, and spraying water In the desulfurization method for digestion gas, which is washed and removed, a part of the sprayed water is circulated in the reaction tower, the pH of the circulating water is measured, and the fresh water is adjusted so that the pH becomes 1-6. Digestion gas desulfurization method characterized by adjusting by replenishment.   The treated water obtained by dehydrating the condensed water generated by cooling the digested gas subjected to methane fermentation and / or the residual liquid after fermentation is used for the fresh water and / or the sprayed water. 6. The method for desulfurizing digestion gas according to 5.   The digestion gas desulfurization method according to claim 5 or 6, wherein a chemical that promotes adhesion of the microorganism is added to the fresh water and / or the sprayed water.   The oxygen concentration of the digestion gas discharged from the reaction tower is measured, and the amount of the air added before introduction into the reaction tower is automatically adjusted so that the measured value becomes a predetermined target value. The method for desulfurization of digestion gas according to any one of claims 5 to 7, wherein the hydrogen sulfide concentration of the digestion gas is also measured, and the target value of the oxygen concentration is automatically changed according to the measured value.   The flow rate of the digestion gas generated by methane fermentation of the organic waste before introduction into the reaction tower is measured in advance, and the reaction gas is added to the digestion gas with a constant ratio of the measured value. It introduce | transduces in a tower | column, The desulfurization method of the digestion gas in any one of Claims 5-7 characterized by the above-mentioned.   When the digestion gas desulfurization method according to any one of claims 5 to 9 is carried out and the voids of the filler are blocked by the growth of elemental sulfur formed by oxidizing the microorganisms and / or hydrogen sulfide, the reaction tower Fill the inside with water up to the filling height of the filling material, blow air from the lower part to float the filling material in the water, remove the microorganisms and elemental sulfur with the rising air flow, wash and react as drain The desulfurization method for digestion gas according to any one of claims 5 to 9, wherein the desulfurization gas is caused to flow out of the tower.   The digestion gas desulfurization method according to claim 10, wherein the timing of cleaning the packing material is determined by a pressure loss value of the reaction tower.