Inner circulation type sequencing batch reactor with membrane separation tank and water treatment method

The invention relates to an inner circulation type sequencing batch reactor with a membrane separation tank and a water treatment method.The inner circulation type sequencing batch reactor used for treating nitrogen and phosphorus flowing into the raw water is characterized by comprising a multi-purpose tank, a main reaction tank, a membrane separation tank, an agitation and liquid transfer device and a transmitter.The multi-purpose tank accommodates the raw water, which is operated as an anaerobic tank or an anoxic tank.The main reaction tank communicating with the multi-purpose tank accommodates the reaction solution flowing from the multi-purpose tank and treats the reaction solution in a sequential way.The membrane separation tank communicates the main reaction tank and accommodates the above treated water, which is equipped with a separation membrane for removing the solid material in the treated water. Then the filtrate is discharged by the separation membrane.The agitation and liquid transfer device is