NOVELTY - Sewage from Stevia rebaudiana production is treated by feeding acidic and basic wastewater into a wastewater regulating tank, regulating pH value, pumping wastewater in upflow anaerobic sludge blanket (UASB) reactor, discharging biogas, delivering wastewater to precipitating tank, concentrating sludge, delivering wastewater in buffer tank, feeding bacterial strain, pumping wastewater into coagulation tank, adding flocculant, adding polyacrylamide, discharging separated wastewater, dehydrating sludge, discharging sludge cake, and reflowing filtered liquid to wastewater regulating tank.    USE - Method of treating sewage from Stevia rebaudiana production (claimed).    ADVANTAGE - The method is simple. The metabolic effect of microorganism coverts oil and organic substances in the wastewater into water and carbon dioxide. The generated biogas can be used.    DETAILED DESCRIPTION - Sewage from Stevia rebaudiana production is treated by feeding acidic and basic wastewater into a wastewater regulating tank via main wastewater pipe, mixing, and regulating amount of water; regulating pH value to 6-7, aerating, supplying oxygen via gas from fan, delivering wastewater to an intermediate water tank via effluent weir, and maintaining water temperature at not less than 20 degrees C; pumping wastewater in UASB reactor, discharging biogas from the UASB reactor, and delivering wastewater to a precipitating tank, naturally precipitating, and pumping sludge into a sludge concentrating tank; delivering precipitated wastewater in a buffer tank to distribute to bio-contact oxidizing tank, aerating and oxygenating with gas, and feeding bacterial strain; pumping wastewater into a coagulation tank, adding microorganism flocculant, flocculating, and flowing wastewater into a tilted plate precipitating tank; adding polyacrylamide (0.005 kg) to reduce residual chemical oxygen demand and oil in water, directly discharging separated wastewater, and lifting separated sludge to sludge concentrating tank; and dehydrating concentrated sludge, discharging sludge cake, and reflowing filtered liquid to wastewater regulating tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a method of treating sewage from Stevia rebaudiana production. (Drawing includes non-English language text)