净水厂污泥/河道淤泥混合煅烧制备除磷材料及其除磷性能研究

金弘毅; 唐雪平; 庄马展; 龚春明; 吴小海; 李飞; 周真明

doi:10.13205/j.hjgc.202308027

净水厂污泥/河道淤泥混合煅烧制备除磷材料及其除磷性能研究

doi: 10.13205/j.hjgc.202308027

1. 华侨大学土木工程学院, 福建厦门 361021;
2. 厦门市环境科学研究院, 福建厦门 361021;
3. 中交一公局厦门工程有限公司, 福建厦门 361000

基金项目:

福建省自然科学基金项目(2019J01052)

国家自然科学基金项目(51878300)

详细信息

作者简介:
金弘毅(1998-),男,研究生,主要研究方向为水体富营养化控制理论与技术的研究。2442344482@qq.com

通讯作者:
周真明(1981-),男,教授,主要研究方向为水环境修复理论与技术的研究。zhenming@hqu.edu.cn

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出版历程
- 收稿日期: 2022-11-28
- 网络出版日期: 2023-11-15

PREPARATION OF PHOSPHORUS REMOVAL MATERIAL BY CALCINATION OF WATER TREATMENT PLANT SLUDGE AND RIVER SILT AND ITS PERFORMANCE

1. College of Civil Engineering, Huaqiao University, Xiamen 361021, China;
2. Xiamen Institute of Environmental Science, Xiamen 361021, China;
3. CCCC First Highway Xiamen Engineering Co., Ltd., Xiamen 361000, China

摘要

摘要: 为探索净水厂污泥(WTPS)与河道淤泥(RS)资源化利用新途径,研究了将其混合煅烧制备除磷材料(C-WTPS/RS)可行性,优化了原料混合比及煅烧温度,分析了C-WTPS/RS除磷性能的主要影响因素,探明了C-WTPS/RS除磷的吸附类型。结果表明:煅烧时间为1 h时,WTPS与RS最佳原料混合比(干重)为5∶5,最佳煅烧温度为600 ℃,制备得到C-WTPS/RS磷吸附量可达0.707 mg/g(正磷酸盐初始浓度为2 mg/L),且C-WTPS/RS不向水体释放氨氮和有机物。C-WTPS/RS除磷效果随着投加量的增加而提高;反应温度为15~25 ℃,C-WTPS/RS除磷效果随着反应温度的升高而提高,反应温度为25~35 ℃,C-WTPS/RS除磷效果受反应温度影响较小;C-WTPS/RS除磷效果在溶液pH为3~9范围较为稳定,溶液pH>9时,WTPS/RS除磷效果呈下降趋势;SO^2-₄、Cl^-和NO^-₃ 3种阴离子对C-WTPS/RS吸附磷的过程影响较小,HCO^-₃对C-WTPS/RS除磷效果有一定抑制作用。热力学分析表明,C-WTPS/RS对磷的吸附是自发的吸热过程,C-WTPS/RS对磷的吸附动力学过程更符合拟二级动力学模型,吸附等温线符合Langmiur吸附等温模型,表明C-WTPS/RS除磷过程主要为单分子层化学吸附,同时伴随物理吸附,理论饱和磷吸附量为6.26 mg/g。
- 除磷 /
- 净水厂污泥 /
- 河道淤泥 /
- 煅烧 /
- 吸附
Abstract: In order to explore a new way of resource utilization of water treatment plant sludge and river silt, this paper studied the feasibility of preparing phosphorus removal material (C-WTPS/RS) by calcination of their mixture. The mixing ratio of raw materials and calcination temperature were optimized, the main influencing factors of phosphorus removal performance of C-WTPS/RS were analyzed, and the adsorption mechanism of C-WTPS/RS for phosphorus removal was discussed. The results of optimization experiments showed that when the calcination time was 1h, the optimal mixing ratio (dry weight) of WTPS to RS was 5∶5, the optimal calcination temperature was 600 ℃, then the phosphorus adsorption capacity of C-WTPS/RS reached 0.707 mg/g (with an initial concentration of orthophosphate of 2 mg/L), and C-WTPS/RS did not release ammonia nitrogen and organic matter into the water. The phosphorus adsorption capacity of C-WTPS/RS increased with the increase in dosage. When the reaction temperature was within 15 to 25 ℃, the phosphorus adsorption capacity of C-WTPS/RS increased with the increase of the reaction temperature. When the reaction temperature was within 25 to 35 ℃, the phosphorus adsorption capacity of C-WTPS/RS was less affected by the reaction temperature. The phosphorus adsorption capacity of WTPS/RS was stable when the solution pH was 3~9, and the phosphorus adsorption capacity of WTPS/RS showed a downward trend when the solution pH was higher than 9. SO₄^2-, Cl^- and NO₃^- had little effect on the phosphorus adsorption of C-WTPS/RS, and HCO₃^- had a certain inhibitory effect on the phosphorus removal performance of C-WTPS/RS. Thermodynamic analysis showed that the adsorption of phosphorus by C-WTPS/RS was a spontaneous endothermic process, The phosphorus adsorption kinetics of C-WTPS/RS was more consistent with the quasi-second-order kinetic model, and the adsorption isotherms were consistent with the Langmuir adsorption isotherm model, indicating that the phosphorus removal process by C-WTPS/RS was mainly monolayer chemisorption, accompanied by physical adsorption, and the theoretical saturated phosphorus adsorption capacity was 6.26 mg/g.
- phosphorus removal /
- water treatment plant sludge /
- river sludge /
- calcination /
- adsorption

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