S1 Supporting Information Mainstream ammonium recovery to advance sustainable urban wastewater management Heidy Cruz a , Ying Yu Law b , Jeremy S. Guest c , Korneel Rabaey f , Damien Batstone e , Bronwyn Laycock d , Willy Verstraete f* , and Ilje Pikaar a * a School of Civil Engineering, The University of Queensland, QLD 4072, Australia b Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, 637551, Singapore c Department of Civil and Environmental Engineering, University of Illinois at Urbana- Champaign, Illinois 61801, United States d School of Chemical Engineering, The University of Queensland, QLD 4072, Australia e Advanced Water Management Centre, The University of Queensland, QLD 4072, Australia f Center for Microbial Ecology and Technology (CMET), Ghent University, Coupure Links 653, 9000 Gent, Belgium