ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,747,174, issued on Sept. 29, was assigned to Passavant Roediger Water Technologies (Hangzhou) Co. Ltd. (Hangzhou, China).

"Method and system for continuous-flow aerobic granular sludge process with improved two-stage sedimentation" was invented by Jiansan Zhang (Hangzhou, China) and Jun Li (Hangzhou, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and a system for a continuous-flow aerobic granular sludge (AGS) process with improved two-stage sedimentation are provided. The method includes the following steps: arranging a biochemical reaction tank, a granular sludge sedimentation tank, and an inclined plate sedimentation tank that are con...