Abstract:Novel biofilm carriers were developed by carbonization of agricultural waste peanut shell under different temperatures (300~700℃) and their physicochemical properties analysis together with biofilm colonization experiment were performed. Increasing reaction temperature facilitated biochar for its surface porous structure development, Zeta potential ascending and hydrophilcity promoting, which could benefit the attached waterborne microbe growth and accumulation on the carriers. The amounts of biofilm colonization per unit mass of biochar carrier were 44%~84% higher than that of commercial ceramsite. The NH4+-N removal rate in reactor packed with biochar carrier produced from high pyrolytic temperature (700℃)was higher than in the ceramsite packed reactor by 1%~3%, while as the rate in reactor packed with biochar carrier produced from middle and low pyrolytic temperatures (300,500℃) were 5%~10% lower than that of ceramsite packed reactor. The results implied that physicochemical properties of biochar carrier surface might strongly impact biofilm microbes on their species and activities.