Removal of Nitrogen and Phosphorus from Wastewater by Modified Pyrite in a Sequencing Batch Reactor (SBR)Hou-Yun Yang, Pei Xu, Hua-Yuan Wang, Wei-Hua Li and Shu-Guang ZhuE3S Web Conf., 136 (2019) 06027DOI: https://doi.org/10.1051/e3sconf/201913606027