“…Initially, PdN‐AnAOB concept was proposed in sidestream treatment referred as DEnitrifying AMmonium OXidation (DEAMOX) which was designed to combine the AnAOB reaction with partial denitrification using sulfide (Kalyuzhnyi, Gladchenko, Mulder, & Versprille, ), acetate (Kalyuzhnyi, Gladchenko, Kang, Mulder, & Versprille, ), or glycerol (Sharp, Niemiec, Khunjar, Galst, & Deur, ) as an electron donor. Mainstream application of PdN‐AnAOB has been getting more attention recently (Cao, Peng, Du, & Wang, ; Du et al, ; Ma, Qian, Yuan, Yuan, & Peng, ; Niemiec, Sharp, & Duer, ). While the AnAOB process is easily controlled whenever nitrite is available, PdN selection has become a critical step determining success of the PdN‐AnAOB approach (Kumar & Lin, ).…”