改性麦饭石对水中氮磷的去除

Experimental Study on Removal of Ammonium and Phosphate in Simulation River Water by Modified Maifan Stone

摘要:

分别采用加热、羟基铝柱撑和稀土镧对天然麦饭石进行改性,以模拟自然富营养水为处理对象进行改性麦饭石脱氮除磷实验研究。考察了投加量、pH值,以及反应时间等因素对改性麦饭石吸附性能的影响。并通过BET、SEM和XRD对改性前后麦饭石结构进行了研究,探讨了麦饭石的改性机理。结果表明,不同改性方法都能使麦饭石去除氮磷能力显著提高,对氨氮和总磷吸附效果最好的是稀土改性麦饭石,其次为柱撑改性麦饭石和热改性麦饭石。pH值为8,麦饭石投加量为15 g/L,反应时间为60 min条件下,稀土改性麦饭石的氨氮和总磷去除率最高,分别达到89%和75%左右。

Abstract:

Heating,hydroxy aluminium and rare earths La were adopted to modify the maifan stone obtained from Shandong Province and the properties of adsorption from simulation river water for the maifan stone were studied. the effects of adsorbent dosage,pH and reaction time on the adsorptive property of modified maifan stone were studied. Besides,through the BET,SEM and XRD,the structure and the mechanism of property modification were discussed,and also the adsorptive capability of the maifan stone in removing nitrogen and phosphorus was investigated.The results indicated that the modification by heating,hydroxy aluminium and rare earths La could significantly increase the adsorption capacity of the modified maifan stone for ammonia nitrogen and total phosphorus. Rare earths La had the best modification effect and followed by hydroxy aluminium and heating. Simultaneously, The experimental results showed that with the pH 8,the total dosage 15 g/L and the reaction time 60 minutes,the removal efficiency of ammonia nitrogen and total phosphorus of maifan stone modified by rare earths La will respectively be about 89% and 75%,which achieved the highest removal rate.