TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: A filler with desulfurization bacteria is placed in the cavity of the upper desulfurization tower, which is further located under the spray nozzle. A hot water coil pipe, a methane inlet pipe and a methane distribution pipe are separately mounted in the cavity of the upper desulfurization tower, which are further arranged under the filler from the up and down in sequence. The methane inlet pipe connects with the methane distribution pipe. The inlet port of the hot water coil pipe and the inlet port of the methane inlet pipe both penetrate through the upper desulfurization tower in a sealed manner and are located out of the upper desulfurization tower. An upper discharge valve of sulfur, which connects with the cavity of the upper desulfurization tower, is mounted at the side of the upper desulfurization tower, which is arranged close to the bottom of the upper desulfurization tower. The inlet port of a liquid inlet pipe is in sealed connection with a nutrient solution refilling tank out of the lower desulfurization tower and the outlet port of the liquid inlet pipe extends into the cavity of the lower desulfurization tower in a sealed manner. A floating valve for controlling the connection of the liquid inlet pipe is mounted at the outlet port of the liquid inlet pipe. A disc-shaped aerator with aeration head is mounted in the lower desulfurization tower. The floating valve is mounted above the disc-shaped aerator. An air inlet pipe out of the lower desulfurization tower connects with the aeration head and is provided with an intake valve and the lower desulfurization tower is provided with a lower discharge valve of sulfur at the bottom, which connects with the cavity of the lower desulfurization tower. A downwardly-bent elbow is mounted at the upper end of the reflux pipe, which connects with the bottom of the cavity of the upper desulfurization tower and the reflux pipe is provided with a balance pipe, which connects the cavity of the reflux pipe with the atmosphere. An exhaust pipe connects with the upper half of the cavity of the lower desulfurization tower. The delivery pipe is separately provided with a filter, a circulating pump and a regulating valve in the flow direction of liquid of the delivery pipe, whose inlet port connects with the cavity of the lower desulfurization tower located under the disc-shaped aerator and a discharge valve is mounted at the lower end of the filter. The upper and lower ends of the filler are respectively provided with a data collector I, which is composed of a temperature sensor and a pH sensor, a data collector II for separately detecting the concentration and flow rate of hydrogen sulfide is mounted at the inlet of the methane inlet pipe. A data collector for separately detecting the concentration and flow rate of hydrogen sulfide is mounted at the methane outlet, and a data collector for detecting the temperature, pH and oxygen content of liquid of the lower desulfurization tower is mounted in the cavity of the lower desulfurization tower.