碱浸和污泥强化对钢渣陶粒除磷效果的影响

唐婧; 罗胜元

doi:10.7513/j.issn.1004-7638.2024.01.015

碱浸和污泥强化对钢渣陶粒除磷效果的影响

doi: 10.7513/j.issn.1004-7638.2024.01.015

唐婧^,,
罗胜元

沈阳建筑大学市政与环境工程学院, 辽宁沈阳 110000

基金项目: 辽宁省教育厅重点攻关项目（LJKZZ20220081）。

详细信息

作者简介:
唐婧，1980年出生，女，黑龙江哈尔滨市人，博士，教授，通讯作者，研究方向为污水处理，E-mail：fairy_ben@163.com

通讯作者:
唐婧，1980年出生，女，黑龙江哈尔滨市人，博士，教授，通讯作者，研究方向为污水处理，E-mail：fairy_ben@163.com

中图分类号: X757,X703
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出版历程
- 收稿日期: 2023-10-26
- 刊出日期: 2024-02-29

Effect of alkali leaching and sludge strengthening on phosphorus removal of steel slag ceramics

Tang Jing^,,
Luo Shengyuan

School of Municipal and Environmental Engineering, Shenyang Jianzhu University, Shenyang110000, Liaoning, China

摘要

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（1 g）。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。
- 钢渣陶粒 /
- 除磷 /
- 碱浸 /
- 污泥强化
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–montmorillonite–sludge composite steel slag ceramic particles. The phosphorus removal performance and mechanism 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 optimal dosage of alkali impregnation–sludge enhanced steel slag ceramics was 0.5 g, which was significantly 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 (Q_max: 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.
- steel slag /
- phosphorus removal /
- alkaline leaching /
- sludge

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图 1 不同陶粒投加量对除磷效果的影响

Figure 1. Effect of ceramite dosage on phosphorus removal

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图 2 初始pH对两种复合陶粒除磷效果的影响

Figure 2. Effect of initial pH on phosphorus removal for two kinds of composite ceramics

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图 3 吸附时间对陶粒除磷性能的影响

Figure 3. Influence of adsorption time on phosphorus removal rate for ceramides

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图 4 不同浓度阴离子对不同复合陶粒除磷效果的影响

（a）钢渣-蒙脱土-可溶性淀粉复合陶粒；（b）碱浸钢渣-蒙脱土-污泥复合陶粒

Figure 4. Influence of different concentrations of anions on phosphorus removal for different composite ceramides

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图 5 钢渣-蒙脱土-可溶性淀粉复合陶粒(a)和碱浸钢渣-蒙脱土-污泥复合陶粒(b)吸附前后XRD分析

Figure 5. XRD analysis of steel slag-montmorillonite-soluble starch composite ceramide (a) and alkali impregnated steel slag-montmorillonite-sludge composite ceramide (b) before and after adsorption

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图 6 钢渣-蒙脱土-可溶性淀粉复合陶粒吸附前（a1）后（a2）和碱浸钢渣-蒙脱土-污泥复合陶粒吸附前（b1）后（b2）扫描电镜

Figure 6. SEM images of steel slag-montmorillonite-soluble starch composite ceramsite before (a1) and after (a2) and alkali-immersed steel slag-montmorillonite-sludge composite ceramsite before (b1) and after (b2) adsorption

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图 7 磷平衡浓度-平衡吸附量趋势

Figure 7. Trend diagram of phosphorus equilibrium concentration-equilibrium adsorption capacity

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图 8 两种陶粒吸附时长-吸附量趋势

Figure 8. Trend diagram of adsorption duration and adsorption capacity of two kinds of ceramides

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表 1 两种钢渣陶粒的等温吸附方程拟合结果与相关参数

Table 1. Isothermal adsorption equation fitting results and related parameters of two kinds of steel slag ceramides

材料	温度/ ℃	Langmuir模型			Freundlich模型
材料	温度/ ℃	Q_max/ (L·mg⁻¹)	$ {\mathrm{k}}_{\mathrm{L}} $/ (L· mg^－1)	R²	k_F/ (mg^1-n·g⁻¹·L^-n)	$ -\dfrac{1}{\mathrm{n}} $	R²
钢渣-蒙脱土-可溶性淀粉复合陶粒	20	19.18	0.40	0.984	5.07	−0.74	0.961
碱浸钢渣-蒙脱土-污泥复合陶粒	20	39.18	0.20	0.987	6.31	−0.81	0.983

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表 2 两种陶粒的动力学吸附方程拟合结果与相关参数

Table 2. Fitting results of kinetic adsorption equations and related parameters of the two ceramides

材料	准一级动力学模型			准二级动力学模型
材料	Q_e/ (mg·g⁻¹)	k₁ /min⁻¹	R²	Q_e/ (mg·g⁻¹)	k₂/[mg·(g·min)⁻¹]	R²
钢渣-蒙脱土-可溶性淀粉复合陶粒	0.086	0.065	0.984	0.108	0.615	0.994
碱浸钢渣-蒙脱土-污泥复合陶粒	0.11	0.13	0.979	0.101	1.206	0.994

下载: 导出CSV

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