Abstract:High Concentration of Purified Attapulgite (HCPA) was added into UF-MBR to form HCPA-UF-MBR process, the decontamination effect of HCPA-UF-MBR and UF-MBR parallel systems treating high color and ammonia nitrogen from source water at low temperature was researched, the performance of activated sludge and membrane pollution in each reactor was studied, HCPA function and efficiency were examined. The results show that the average removal rate of chromaticity, CODMn, NH -N and TN was 94.60%, 81.61%, 98.44% and 58.30%, respectively. The NO -N and NO -N concentration from the effluent were lower. After HCPA dosing, the decontamination effect and anti shock loading capability of UF-MBR were improved. The sludge total activity and nitrification activity increased by 9.09% and 105.88%, respectively. The HCPA-UF-MBR reactor achieved stability in short time and small fluctuations. The nitrification and denitrification processes of activated sludge inside HCPA-UF-MBR reactor were more fully. In addition, HCPA adsorbed organic matter in mixture and improved the sludge mixture properties. It makes the cake layer on the membrane surface more loose and more permeable. It reduced effectively the degree of membrane fouling.