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  

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

作　　者：金弘毅 唐雪平 庄马展 龚春明 吴小海 李飞[1] 周真明[1] JIN Hongyi;Tang Xueping;Zhuang Mazhan;Gong Chunming;Wu Xiaohai;LI Fei;ZHOU Zhenming(College of Civil Engineering,Huaqiao University,Xiamen 361021,China;Xiamen Institute of Environmental Science,Xiamen 361021,China;CCCC First Highway Xiamen Engineering Co.,Ltd.,Xiamen 361000,China)

机构地区：[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

出　　处：《环境工程》2023年第8期209-217,共9页Environmental Engineering

基　　金：国家自然科学基金项目(51878300);福建省自然科学基金项目(2019J01052)。

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_(4)^(2-)、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。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.SO_(4)^(2-),Cl^(-) and NO_(3)^(-) had little effect on the phosphorus adsorption of C-WTPS/RS,and HCO_(3)^(-)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 che

关 键 词：除磷 净水厂污泥 河道淤泥 煅烧 吸附 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]