摘要
深圳下坪垃圾填埋场渗滤液的COD浓度为6808mg/L,NH3-N的浓度高达3220mg/L.采用厌氧生物处理法处理有机物浓度高的废水时,由于过高的NH3-N对生物有抑制或毒害作用,为提高废水的可生化性,需降低渗滤液里的NH3-N浓度.本试验采用了盐酸、氧化镁和磷酸作为去除NH3-N的沉淀药剂.沉淀药剂与渗滤液中的NH3-N发生化学反应,生成六水硫酸铵镁(MgNH4PO4·6H2O)沉淀物.试验反应速度快,没有二次污染,而且六水硫酸铵镁可作为多种农作物的复合肥.在pH=9 5的试验条件下,当n(NH+4)=1∶1 2∶1时,渗滤液中NH3 N的去除率达76 2%,并且可同4)∶n(Mg2+)∶n(PO3-时去除渗滤液中的40%的COD.
Landfill leachates are nondegradable wastewater because they contain high concentration of ammonia nitrogen. A method of chemical precipitation, which uses HCl, MgO and H3PO4 to react with NH3 and produces sediment, is used to remove NH3N. Thus, not only NH3N can meet effluent standard, but also the landfill leachates can be treated more easily. Under the condition of pH=95 and n(NH+4) ∶n(Mg2+) ∶n(PO3-4)=1∶12∶1, the removal rate of NH3N is 762% and the removal rate of COD is 40%.
出处
《桂林工学院学报》
2003年第1期89-92,共4页
Journal of Guilin University of Technology
