Organic wastewater treatment device and method

The invention discloses an organic wastewater treatment device and method, and the device is characterized in that the inlet end of a sedimentation tank is connected with a cleaning tank, and the bottom end of the sedimentation tank is connected with the inlet end of an adsorption tank; the inlet end of a clarification tank is connected with the outlet end of the adsorption tank; the outlet end ofthe clarification tank is connected with the water inlet of an oxidation tank; an ozone generator is connected with a gas distribution system; the inlet end of a sludge dewatering system is respectively connected with the bottom end of the adsorption tank and the bottom end of the clarification tank, the first outlet end of the sludge dewatering system is connected with the inlet end of the adsorption tank, and the second outlet end of the sludge dewatering system is connected with a boiler. The method comprises the following steps: dissolving water-soluble substances in fly ash; adsorbing organic matters in the orga