改性沸石复合材料的制备及对废水同步脱氮除磷

采用十六烷基三甲基溴化铵(HDTMA)溶液和LaCl3溶液对人造沸石进行改性,以实现其对废水的同步脱氮除磷。通过正交试验确定了改性沸石制备的最佳条件,并运用SEM、BET、EDS、FTIR、XRD和TG技术对改性沸石进行了表征。实验结果表明:改性可提高人造沸石对废水中氨氮(NH4+-N)和总磷(TP)的去除率;改性沸石制备的最佳条件为HDTMA质量浓度12 g/L、LaCl3质量浓度9 g/L、HDTMA溶液和LaCl3溶液的体积比1∶5,固液比1∶90;采用该条件下制备的改性沸石吸附处理NH4+-N和TP的质量浓度分别为23.78 mg/L和11.78 mg/L的废水,NH4+-N和TP的去除率分别达96.88%和95.12%。表征结果显示,改性后,HDTMA和LaCl3有效负载于人造沸石表面,且未改变人造沸石的基本骨架。

Preparation of modified zeolite composite materials and simultaneous removal of nitrogen and phosphate from wastewater

The artificial zeolite was modified using hexadecyl trimethyl ammonium bromide （HDTMA）solution and LaCl₃ solution,and used for simultaneous nitrogen and phosphorus removal from wastewater. The optimum preparation conditions were determined by orthogonal test. The modified zeolite was characterized by SEM,BET,EDS,FTIR,XRD and TG. The results show that：The removal rate of ammonia nitrogen （NH₄⁺-N）and total phosphorus （TP）in wastewater can be increased by modification;Under the optimum preparation conditions of HDTMA mass concentration 12 g/L,LaCl₃ mass concentration 9 g/L,volume ratio of HDTMA solution to LaCl₃ solution 1∶5 and solid-liquid ratio 1∶90,the modified zeolite is prepared and used to treat the wastewater with 23.78 mg/L of NH₄⁺-N mass concentration and 11.78 mg/L of TP,the removal rate of NH₄⁺-N and TP are 96.88% and 95.12%,respectively. The characterization results show that HDTMA and LaCl₃ are effectively supported on the surface of the modified artificial zeolite without changing its basic skeleton.