Performance of anammox UASB reactor treating low strength wastewater under moderate and low temperatures

► Performance of anammox reactor treating low strength wastewater was studied at 16-30 °C. ► Low strength nitrogen could be efficiently removed via anammox at 16-30 °C. ► Anammox granular sludge was formed at 30 °C and maintained at 16-25 °C. ► Greenhouse gas N2O emission was very low in this anammox UASB reactor.