本文選題：氫氧化鐵 + 改性濾料��； 參考：《哈爾濱理工大學》2017年碩士論文

【摘要】：目前去除水中硫酸鹽的方法有:化學沉淀法(鋇法、鈣法)、物理法(冷凍法、膜法)、離子交換法、生物法、吸附法等。近年來,研究者們一直在關注吸附法去除水中的硫酸鹽,常采用的吸附材料有針鐵礦、蒙脫石等多孔材料。本研究采用氫氧化鐵對石英砂濾料進行改性,考察改性濾料層對水中硫酸鹽的去除效果。實驗將新生態(tài)氫氧化鐵附著在7cm厚的濾床中,通過濾床過濾含有硫酸鹽的原水,考察濾料種類、濾料粒徑、硫酸鹽濃度、過濾速度、p H值等對改性濾料去除硫酸鹽的影響。實驗結果表明:氫氧化鐵改性濾料表層存在Fe(OH)_3溶膠體系,膠狀的水合氧化鐵(Ⅲ)有較強的吸附性,當以較低的濾速注入含硫酸根的原水時,硫酸根可與Fe(OH)_3溶膠表面吸附的高價鐵離子發(fā)生聚沉(尤其是在酸性環(huán)境下),形成聚沉物,并被濾料截留,從而使硫酸根得到去除。研究發(fā)現(xiàn),采用新生態(tài)氫氧化鐵改性過的石英砂(粒徑為1.18-1.4mm)濾料對硫酸根的去除效果要優(yōu)于新生態(tài)氫氧化鐵改性過的柱狀活性炭濾料(粒徑為1.5mm),二者的平均去除率分別為71.58%和62%;對于粒徑為1.18-1.4mm的改性石英砂,在其它條件一定時,初始硫酸根濃度越小,硫酸根的去除率越高;通過改變石英砂的粒徑范圍發(fā)現(xiàn),粒徑為0.42-0.71mm時,硫酸根的去除效果最佳,平均去除率達到了80%;在不同的粒徑范圍內(nèi),用新生態(tài)氫氧化鐵改性過的石英砂濾料對硫酸根的去除效果要優(yōu)于用預制備氫氧化鐵改性過的石英砂濾料,二者的去除率范圍分別為69.76%-79.87%和59.57%-72.12%;盡管硫酸根的去除率與Fe(OH)3在石英砂濾料上的涂裝量成正比,但由此帶來的變化量不大,當涂裝量從1000 mg·L~(-1)變化到2000 mg·L~(-1)時,硫酸根的去除率變化量不超過5%;過濾過程因素對新生態(tài)氫氧化鐵改性濾料去除硫酸根的效率有影響,隨著原水水溫的升高,硫酸根的去除率總體呈上升趨勢,在原水pH值為3-10時,隨著p H值的增大,硫酸根去除率呈現(xiàn)減小趨勢,p H值對吸附容量也有影響,原水pH=3-4時,吸附容量最大,為23mg·g~(-1)。
[Abstract]:At present, the methods of removing sulfate in water include chemical precipitation method (barium method, calcium method), physical method (freezing method, membrane method, ion exchange method, biological method, adsorption method and so on). In recent years, researchers have been paying attention to the adsorption of sulfate in water. The adsorption materials are goethite, montmorillonite and other porous materials. In this study, ferric hydroxide was used to modify quartz sand filter material, and the removal effect of sulfate in water by modified filter media layer was investigated. The new ecological ferric hydroxide was attached to the 7cm thick filter bed. The raw water containing sulfate was filtered by the filter bed. The effects of filter media type, filter media particle size, sulfate concentration, filtration speed and pH value on the removal of sulfate from the modified filter media were investigated. The experimental results show that there is Fe(OH)_3 sol system in the surface layer of ferric hydroxide modified filter media, and the colloidal hydrated ferric oxide (鈪，

本文編號：1951872