以铜冶炼废渣为主要原料,碳酸氢钠为助熔剂,造孔剂选用草秸秆,采用高温烧结法制备铜渣基多孔陶粒,为曝气生物滤池提供滤料以处理含氨氮等的废水。试验研究了烧结工艺参数变化对陶粒性能的影响,铜渣基陶粒作为滤料的曝气生物滤池对废水中氨氮的去除效果。结果表明,在配比量m(铜渣)∶m(碳酸氢钠)∶m(造孔剂)(质量比)=10∶1∶1,煅烧温度为1050℃,保温时间30 min的条件下,所制得陶粒性能较优,性能指标符合国标要求;所制得陶粒作滤料的曝气生物滤池处理含氨氮模拟废水时,在碳氮比为4∶1、水力停留时间为6 h的条件下,运行30 d后,废水中NH4^+-N的去除率可达80%。
A porous ceramsite based on copper slag was prepared by high-temperature sintering with copper smelting slag as main raw material,sodium bicarbonate as flux and straw as pore forming agent.The porous ceramsites prepared were applied as filter material for a BAF to treat wastewater containing ammonia nitrogen.The effects of sintering parameters on performances of the ceramsite were studied.The removal of ammonia nitrogen from wastewater by the BAF with copper slag ceramsite as filter material was investigated.The experimental results showed that under the conditions of copper slag:sodium bicarbonate:pore forming agent(mass ratio)=10:1:1,calcining temperature of 1050℃and holding timeof 30 minutes,ceramsite was prepared with optimized performances which met the requirements of the national standard.When a biological aerated filter with the ceramsite as filter material was used to treat simulated wastewater containing ammonia nitrogen,under the conditions of carbon nitrogen ratio of 4∶1 and hydraulic retention time of 6 hours,the removal rate of NH4^+-N reached 80%after 30 days.
Journal of Functional Materials
biological aerated filter
ammonia nitrogen wastewater