TREATMENT METHOD AND APPARATUS OF RICE PROCESSING WASTEWATER

摘要

PROBLEM TO BE SOLVED: To provide a treatment method and device of rice processing wastewater capable of positively removing nitrogen and phosphorus even though it is rice processing wastewater including hardly decomposable organic matters.SOLUTION: The treatment apparatus of rice processing wastewater which removes nitrogen and phosphorus contained in the rice processing wastewater simultaneously includes: an ozone microbubble generating means 11 dissolving ozone in microbubbles to generate ozone microbubbles; a pretreatment means (pretreatment tank) 10 converting hardly decomposable organic matters in the rice processing wastewater into low molecular matters by supplying the rice processing wastewater with ozone microbubbles generated at the ozone microbubble generating means 11; and a biological treatment means (reaction tank) 35 which is connected to the subsequent stage of the pretreatment means 10, which treats the rice processing wastewater in the order of an anaerobic treatment, aerobic treatment and anoxia treatment under the presence of at least either phosphous-accumulating organisms or denitrifying phosphous-accumulating organisms, and removes nitrogen and phosphorus contained in the rice processing wastewater.