Nitrogen removal performance and bacterial flora analysis of a nitrification‑sulphur autotrophic denitrification coupled with permeable reaction wall (NSAD+PRW) treating rare earth mine groundwater - Shiqi Wang; Bai Gao; Shengfeng Liu; Nan Chen; Wenjie Ma; Rong Wang; Junzhe Wu; Yanling Yu (Journal of Water Process Engineering, 2023)