The invention wastewater relates to processing systems, and more particularly, to the inlet for sucking the raw water contained in the failure water storage tank, and a filtration unit to filter the foreign substances contained in raw water that flows from the portion above the inlet, said filtration unit a buffer unit, the ozone anatomy and the ozone dissolution for which input the number of ozone dissolved generate the soluble generates ozone by combining the raw water injected ozone portion with ozone said buffer receiving supply being supplied to the buffer to receive input coarse raw water and the number of the ozone treatment raw water supply unit for supplying the ozone-treated raw water to generate an ozone treatment generated by treating the raw water to the raw water inputted to the other parts of the buffer storage tank failure, as at least one less than the set temperature of the anatomy for the buffer unit or ozone keeping constant temperature and the holding part and the suction and supply of the operating amount of the ozonated water, the constant temperature holding portion and the ozone water in the raw water to And it is achieved by the wastewater treatment system comprises a control unit for automatically controlling comprises a. As a result, a group while you can still enjoy the small public sewage treatment facility or disposal small public sewage treatment plants installed due to monitoring through automation, easy operation and management, and the quality of ozone gas and then by collecting the enemies collected in a buffer tank dissolved by using the principle of producing the ozonated water by treating the raw water, and automatically supplies the thus treated raw water in the water storage tank of a small public sewage treatment plant can be rapidly purify the raw water to be discharged.