Simulated sewage. Using artificially prepared simulated domestic sewage, aerobic granular sludge with simultaneous nitrogen and phosphorus removal functions was successfully cultivated in a sequencing batch reactor (SBR). The reactor was inoculated with activated sludge, and PAC and PAC were added. Sepiolite is mixed with activated sludge; the water inlet device is used to pump synthetic wastewater into the reactor, and aerobic granular sludge is cultivated through the SBR treatment process.