新型除磷填料的制备及再生能力试验

Preparation and regeneration ability test of a new type of phosphorus removal filler

以沸石、粉煤灰和煤气化渣为原材料,制备一种低成本、高效的新型除磷填料,对其吸附性能以及再生能力进行探究,并对填料吸附磷前后的微观形貌、元素组成以及晶体结构等变化进行分析。研究结果表明,填料主要组成为O、Si、Ca、Al、Fe、Mg,其中Ca元素质量分数最高;吸附后填料表面变得光滑平整,EDS和XRD分析表明Ca元素在吸附过程中发挥重要作用;在磷质量浓度为50 mg/L、吸附剂投加量为14 g/L的条件下,新型除磷填料对磷的去除率达到了80%,吸附性能相较于原材料明显提高;在pH=1和pH=13的条件下,填料对磷的释放率分别为142.39%和83.26%,酸性条件的解吸效果明显优于碱性条件,表明强酸/强碱有利于磷从填料中释放出来;再生能力实验研究显示,经过4次再生后,酸性再生后的填料对磷的去除率明显低于碱性再生;在实际应用中碱性再生1~2次时,填料对磷的去除率在60%以上,具有较高的再生回用可能性。

Zeolite,fly ash and coal gasification slag were used as raw materials to prepare a new type of phosphorus removal filler with low cost and high efficiency through artificial improvement,and its adsorption performance and regeneration ability were explored.The changes in the microstructure,elemental composition,and crystal structure of the filler phosphorus before and after adsorption was analyzed.The research results indicated that the main com⁃ponents of the filler were O,Si,Ca,Al,Fe,Mg,of which Ca had the highest mass fraction.The surface of the fillers became smooth and flat after adsorption,EDS and XRD analysis indicated that Ca played an important role in the adsorption process.Under the conditions of a phosphorus concentration of 50 mg/L and an adsorbent of 14 g/L,the new phosphorus removal filler achieved a phosphorus removal rate of 80%,and its adsorption performance was sig⁃nificantly improved compared with the raw materials.Under the environmental conditions of pH=1 and pH=13,the release rates of the fillers were 142.39%and 83.26%respectively.The desorption effect under acidic conditions was significantly better than that under alkaline conditions,indicating that strong acids/bases were beneficial for the re⁃lease of phosphorus from the fillers.The experimental study on regeneration capacity showed that after four regenera⁃tions,the removal rate of phosphorus by the acidic regeneration filler was significantly lower than that by the alkaline regeneration filler.In practical applications of alkaline regeneration 1-2 times,the removal rate of phosphorus by the filler was over 60%,which had a high possibility of regeneration and reuse.