1. Bednarek A, Szklarek S, Zalewski M (2014) Nitrogen pollution removal from areas of intensive farming—comparison of various denitrification biotechnologies. Ecohydrol Hydrobiol 14(2):132–141
2. Blackburne R, Yuan Z, Keller J (2008) Partial nitrification to nitrite using low dissolved oxygen concentration as the main selection factor. Biodegradation 19(2):303–312
3. Cao Y, Kwok BH, Yong WH, Chua SC, Wah YL, Ghani YABD (2013) Mainstream partial nitritation-ANAMMOX nitrogen removal in the largest full-scale activated sludge process in Singapore: process analysis. In: Proc. WEF/IWA nutrient removal and recovery conference. Water Environment Federation, Richmond, VA, pp 28–31
4. Cao Y, Hong KB, Zhou Y, Liu Y, Jianzhong H, Chye CS, Long WY, Ghani Y (2015) The mainstream partial nitritation/ANAMMOX nitrogen removal process in the largest water reclamation plant in Singapore. J Beijing Univ Technol 41(10):1441
5. Cao Y, van Loosdrecht MC, Daigger GT (2017) Mainstream partial nitritation-ANAMMOX in municipal wastewater treatment: status, bottlenecks, and further studies. Appl Microbiol Biotechnol 101(4):1365–1383