新型铁碳微电解填料制备与除磷性能评价

Preparation and phosphorus removal performance evaluation of new ironcarbon micro-electrolysis filler

针对传统铁碳填料处理污水活性低的问题,通过均质化-碳化-成型工艺制备新型铁碳微电解填料,采用SEM-EDS、XRD等方法对制备填料进行了表征,探讨了新型填料除磷机理;同时,开展了填料制备条件优化及生活污水除磷性能评价研究。结果表明,新型填料(Fe-C)由于焦油经高温碳化处理可在海绵铁表面及内部孔道形成大量铁碳微原电池,提高了电化学反应速率,其磷脱除率显著高于传统填料(Fe/C);在焦油/铁比(Tar/Fe)为0.3、碳化温度为950℃、恒温时间为0 min、黏结剂质量分数为30%、900℃焙烧90 min条件下,制备的填料除磷性能最佳,除磷效率达98%,可实现含磷废水达标排放。

Iron/carbon(Fe/C) filler produced by traditional process shows disadvantage of low activity when it was applied in sewage treatment. A novel iron-carbon(Fe-C) micro-electrolytic filler was developed to overcome this issue through a joint homogenizing-carbonizing-forming procedure. XRD and SEM were used to characterize the(Fe-C) micro-electrolytic filler products of each procedure during the preparation process.Furthermore, the preparation conditions optimization and performance evaluation on phosphorus removal of the new Fe-C filler was conducted. Experiment results show that lots of Fe-C micro primary batteries were formed on the surface and internal channels of sponge iron when tar was treated by high temperature carbonization, and the electrochemical reaction rate increased, which accounted for significantly higher phosphorus removal efficiency by new Fe-C filler than traditional Fe/C filler. When mass ratio of tar to sponge iron, carbonizing temperature, holding time, binder mass fraction roasting temperature and roasting period were set as 0.3, 950 ℃,0 min, 30%, 900 ℃ and 90 min, respectively, the synthetic Fe-C filler presented an optimum phosphorus removal performance with a removal efficiency as high as 98%, the effluents could meet the discharge standard of phosphorous-contained sewage.