摘要
为提高钢渣除磷效果,采用碱浸预处理,并添加污泥强化制备碱浸钢渣-蒙脱土-污泥复合钢渣陶粒,与钢渣-蒙脱土-可溶性淀粉复合陶粒进行对比研究,探讨强化后钢渣陶粒的除磷性能和除磷机理,考察含磷溶液中磷的去除.结果表明,两种钢渣陶粒的最大除磷率均可达到93％,磷酸盐浓度为1 mg/L时,碱浸-污泥强化钢渣陶粒的最佳投加量为0.5 g,显著低于未强化钢渣陶粒(1g).扫描电镜显示碱浸-污泥强化钢渣陶粒孔隙更为密集.X射线衍射表明两种陶粒内含多种金属盐,可与水样中磷酸根离子发生反应将其去除.两种陶粒对Langmuir吸附等温方程拟合度最高,碱浸-污泥强化钢渣陶粒吸附饱和时,最大吸附量(39.18 mg/g)高于未强化钢渣陶粒(19.18 mg/g).两种陶粒对准二级动力学模型的拟合度高于准一级动力学模型,表明两种陶粒对磷吸附属于单分子层吸附,以化学吸附为主.
Abstract
In order to improve the phosphorus removal effect of steel slag,alkali leaching pretreatment was used and residual sludge was added to strengthen the preparation of alkali leaching slag-montmoril-lonite-sludge composite steel slag ceramic particles.The phosphorus removal performance and mechan-ism of enhanced steel slag ceramic particles were discussed,and the removal of phosphorus-containing wastewater was investigated.The results showed that the maximum phosphorus removal rate of the two kinds of steel slag ceramics could reach 93％.When the phosphate concentration was 1 mg/L,the op-timal dosage of alkali impregnation-sludge enhanced steel slag ceramics was 0.5 g,which was signific-antly lower than that of unstrengthened steel slag ceramics(1 g).Scanning.electron microscopy(SEM)analysis showed that the pores of alkali impregnation-sludge enhanced steel slag ceramics were denser.X-ray diffraction(XRD)characterization showed that the two ceramics contained a variety of metal salts,which could be removed by reacting with phosphate ions in the water samples.The two kinds of ceramics have the highest fitting degree to Langmuir adsorption isothermal equation,and the maximum adsorption capacity of alkali impregnated sludge strengthened steel slag ceramics is higher than that of unstrengthened steel slag ceramics(Qmax:39.18＞19.18 mg).The fit degree of the two models is higher than that of the quasi-first order kinetic model,which indicates that the adsorption of phosphorus by the two kinds of ceramics belongs to monolayer adsorption and is mainly chemisorption.
基金项目
辽宁省教育厅重点攻关项目(LJKZZ20220081)
国家科技期刊平台
NSTL
万方数据