铝污泥吸附水中磷的影响因素及响应面法优化
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摘要
为提高铝污泥的利用效率,将其更好地应用于富营养化水体的修复之中,以给水厂脱水铝污泥为吸附材料对水中的磷进行吸附,考察铝污泥投加量、铝污泥颗粒粒径、体系pH、水样磷浓度对吸附效果的影响。拟合了等温吸附方程,并借助响应面分析中的BBD(Box-Behnken Design)模型确定吸附时间、pH和铝污泥投加量这3种因素对吸附反应影响的显著性及交互作用的强弱,同时利用此模型对实验条件进行优化。结果表明:①上述4种因素均对吸附过程有所影响,Langmuir等温吸附方程拟合效果较好,铝污泥对磷的理论饱和吸附量为1.487 mg/g(温度298 K)。②铝污泥投加量对吸附的影响最为显著,pH和反应时间产生的交互作用最强。③当水体中磷浓度为10 mg/L时,其最佳工艺条件为铝污泥投加量12 g/L、pH=4.5及反应时间48 h,最大去除率为92.38%。
In order to improve the utilization efficiency of Aluminum sludge and make it better used in the remediation of eutrophic water body, we carried out a series of phosphorus adsorption experiments in water by dewatered Aluminum sludge(DAS) from water supply plant as adsorptive material. The influence of DAS dosage and particle size, pH and phosphorus concentration in water samples on the absorption process were studied. The Langmuir and Freundlich isothermal adsorption equation model were used to fit the absorption process. Box-Behnken Design(BBD)model in response surface methodology(RSM) was used to evaluate the influence significance of several variables, including adsorption time, pH and DAS dosage and their interaction effects. In addition, we have optimized the experimental conditions by the BBD model. The results showed that the four factors mentioned above all have some influence on the adsorption process. The fitting effect of Langmuir isotherm adsorption equation was better. The theoretical saturated adsorption capacity of phosphorus by aluminum sludge is 1.487 mg/g(at 298 K). The response surface analysis results showed that the amount of aluminum sludge had the most significant effect on the adsorption, and the interaction effects between pH and reaction time were the strongest. When the phosphorus concentration in the water is 10 mg/L, the optimum technological conditions are as follows: the aluminum sludge dosage is 12 g/L, pH is 4.5 and reaction time is 48 h, and the corresponding maximum removal rate is 92.38%.
In order to improve the utilization efficiency of Aluminum sludge and make it better used in the remediation of eutrophic water body, we carried out a series of phosphorus adsorption experiments in water by dewatered Aluminum sludge(DAS) from water supply plant as adsorptive material. The influence of DAS dosage and particle size, pH and phosphorus concentration in water samples on the absorption process were studied. The Langmuir and Freundlich isothermal adsorption equation model were used to fit the absorption process. Box-Behnken Design(BBD)model in response surface methodology(RSM) was used to evaluate the influence significance of several variables, including adsorption time, pH and DAS dosage and their interaction effects. In addition, we have optimized the experimental conditions by the BBD model. The results showed that the four factors mentioned above all have some influence on the adsorption process. The fitting effect of Langmuir isotherm adsorption equation was better. The theoretical saturated adsorption capacity of phosphorus by aluminum sludge is 1.487 mg/g(at 298 K). The response surface analysis results showed that the amount of aluminum sludge had the most significant effect on the adsorption, and the interaction effects between pH and reaction time were the strongest. When the phosphorus concentration in the water is 10 mg/L, the optimum technological conditions are as follows: the aluminum sludge dosage is 12 g/L, pH is 4.5 and reaction time is 48 h, and the corresponding maximum removal rate is 92.38%.
引文
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[4] 卜洁莹,王在刚,王志军.从给水污泥回收铝盐混凝剂与资源化利用研究[J].中国给水排水,2015,31(7):104-108.
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[7] Zhao Y Q,Babatunde A O,Razali M,et al.Use of dewatered alum sludge as a substrate in reed bed treatment systems for wastewater treatment[J].Environmental Letters,2007,43(1):105-110.
[8] 杨永哲,赵亚乾,Akintunde Babatunde,等.给水厂铝污泥对磷的吸附特性及陈化时间的影响[J].中国给水排水,2015(31):137-141.
[9] 赵晓红,赵亚乾,杨永哲,等.铝污泥人工湿地污水处理系统小试研究[J].中国给水排水,2015,31(13):110-115.
[10] 陈毅忠,王利平,杜尔登,等.自来水厂脱水铝污泥对水中磷的吸附去除研究[J].中国给水排水,2011,27(23):88-91.
[11] 刘振中,邓慧萍,詹健,等.改性活性炭除亚砷酸盐的性能研究[J].环境科学,2009,30(3):780-786.
[12] 仇付国,王瑜.水厂铝污泥去除水中污染物研究进展[J].水处理技术,2014,40(6):1-8,13.
[13] 胡文华,吴慧芳.聚合氯化铝污泥对磷的吸附动力学及其吸附速率控制步骤[J].水处理技术,2011,37(6):19-22.
[14] 殷海青.浅析碳纳米管对重金属离子的吸附[J].青海科技,2005(5):44-46.
[15] Yang Y,Zhao Y Q,Babatunde A O,et al.Characteristics and mechanisms of phosphate adsorption on dewatered alum sludge[J].Separation and Purification Technology,2006,51(2):193-200.
[16] 马宏林,贺涛,洪雷,等.给水污泥吸附磷的动力学及热力学特性研究[C]//2014中国环境科学学会学术年会论文集(第5章) ,2014:4141-4144.
[17] Babatunde A O,Zhao Y Q,Burke A M,et al.Characterization of aluminum-based water treatment residual for potential phosphorus removal in engineered wetlands[J].Environmental Pollution,2009,157(10):2830-2836.
[18] Zhao X H,Zhao Y Q,Kearney P.Transformation of beneficially reused aluminum sludge to potential P and Al resource after employing as P-trapping material for wastewater treatment in constructed wetland[J].Chemical Engineering Journal,2011,174(1):206-212.
[19] 高永坤,童延斌,鲁建江.响应面分析法优化造纸污泥吸附剂除磷工艺[J].环境工程学报,2012,6(5):1727-1733.
[20] 马宏林,贺涛,洪雷,等.响应面分析法优化给水污泥吸附除磷工艺[J].环境工程学报,2015,9(2):546-552.
[2] 郑彦华,王增长.给水厂污泥脱水与处置[J].科技情报开发与经济,2007(7):177-180.
[3] 朱亚琴,徐乐中,李大鹏.给水厂污泥处置与资源化利用[J].广东化工,2011,38(12):92-93.
[4] 卜洁莹,王在刚,王志军.从给水污泥回收铝盐混凝剂与资源化利用研究[J].中国给水排水,2015,31(7):104-108.
[5] 陈静,许建华.给水厂污泥处理[J].净水技术,1998(3):14-16.
[6] 仇付国,孙瑶,陈丽霞.给水厂铝污泥特性分析及吸附氮磷性能试验[J].环境工程,2016,34(4):54-59.
[7] Zhao Y Q,Babatunde A O,Razali M,et al.Use of dewatered alum sludge as a substrate in reed bed treatment systems for wastewater treatment[J].Environmental Letters,2007,43(1):105-110.
[8] 杨永哲,赵亚乾,Akintunde Babatunde,等.给水厂铝污泥对磷的吸附特性及陈化时间的影响[J].中国给水排水,2015(31):137-141.
[9] 赵晓红,赵亚乾,杨永哲,等.铝污泥人工湿地污水处理系统小试研究[J].中国给水排水,2015,31(13):110-115.
[10] 陈毅忠,王利平,杜尔登,等.自来水厂脱水铝污泥对水中磷的吸附去除研究[J].中国给水排水,2011,27(23):88-91.
[11] 刘振中,邓慧萍,詹健,等.改性活性炭除亚砷酸盐的性能研究[J].环境科学,2009,30(3):780-786.
[12] 仇付国,王瑜.水厂铝污泥去除水中污染物研究进展[J].水处理技术,2014,40(6):1-8,13.
[13] 胡文华,吴慧芳.聚合氯化铝污泥对磷的吸附动力学及其吸附速率控制步骤[J].水处理技术,2011,37(6):19-22.
[14] 殷海青.浅析碳纳米管对重金属离子的吸附[J].青海科技,2005(5):44-46.
[15] Yang Y,Zhao Y Q,Babatunde A O,et al.Characteristics and mechanisms of phosphate adsorption on dewatered alum sludge[J].Separation and Purification Technology,2006,51(2):193-200.
[16] 马宏林,贺涛,洪雷,等.给水污泥吸附磷的动力学及热力学特性研究[C]//2014中国环境科学学会学术年会论文集(第5章) ,2014:4141-4144.
[17] Babatunde A O,Zhao Y Q,Burke A M,et al.Characterization of aluminum-based water treatment residual for potential phosphorus removal in engineered wetlands[J].Environmental Pollution,2009,157(10):2830-2836.
[18] Zhao X H,Zhao Y Q,Kearney P.Transformation of beneficially reused aluminum sludge to potential P and Al resource after employing as P-trapping material for wastewater treatment in constructed wetland[J].Chemical Engineering Journal,2011,174(1):206-212.
[19] 高永坤,童延斌,鲁建江.响应面分析法优化造纸污泥吸附剂除磷工艺[J].环境工程学报,2012,6(5):1727-1733.
[20] 马宏林,贺涛,洪雷,等.响应面分析法优化给水污泥吸附除磷工艺[J].环境工程学报,2015,9(2):546-552.
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