生物炭载体的表面特征和挂膜性能研究

以花生壳为原料,于300~700℃下热解制备生物炭以作为生物膜载体,对其进行了理化性质表征和挂膜试验.结果表明:较高的热解温度(700℃)能促进生物炭载体孔隙结构发展,生物炭表面ζ电位上升,亲水性增加,从而有利于污水微生物的附着和生长. 挂膜期间,生物炭载体单位挂膜量分别高出陶粒44%~84%,高温(700℃)生物炭载体生物膜对NH4+-N的去除率高出陶粒1%~3%,而中低温(300、500℃)生物炭载体生物膜对NH4+-N的去除率较陶粒低5%~10%,显示生物炭表面理化性质可能对附着的生物膜微生物种类和活性产生影响.

Characteristics and performances of biofilm carrier prepared from agro-based biochar

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.