| 淋洗过程预分离细颗粒悬液重金属去除的研究 |
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| 引用本文： | 宋永伟,王 果,胡欣欣,王振达.淋洗过程预分离细颗粒悬液重金属去除的研究[J].土壤,2012,44(4):639-644. |
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| 作者姓名： | 宋永伟 王 果 胡欣欣 王振达 |
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| 作者单位： | 福建农林大学资源与环境学院,福州,350002 |
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| 基金项目： | 中央环保专项基金(财建[2007]661号)资助 |
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| 摘 要： | 研究了4种絮凝剂对在土壤淋洗过程中预分离出来的细颗粒悬液中的Cd、Pb、Zn的去除效果以筛选最佳絮凝剂及其用量。结果表明,随着硫酸铝添加量的增加,悬液中Cd、Pb、Zn浓度呈先逐渐降低后上升的趋势;3种元素浓度均随着聚合氯化铝(PAC)和CaO添加量的增加而迅速降低;随着硫酸亚铁添加量的增加,悬液中Pb、Zn浓度逐渐降低,而Cd浓度先迅速降低后逐渐回升。综合悬液中Cd、Pb、Zn的去除效果,选择硫酸铝、PAC、硫酸亚铁和CaO的最佳添加量分别为:0.25、0.04、1.0、0.3 g/L,此时3种元素浓度均达到农田灌溉水质标准。在最佳添加量下按每万吨悬液处理量换算,4种絮凝剂絮凝成本依次为:硫酸亚铁(4500元)>硫酸铝(1900元)>PAC(1000元)>CaO(900元)。因此,选择CaO作为最佳絮凝剂,相应最佳絮凝pH范围为10～11。
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| 关 键 词： | 土壤淋洗 细颗粒悬液 重金属 最佳絮凝剂 CaO |
Effects of removing heavy metals from suspensions separated by soil washing with four flocculants |
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| SONG Yong-wei,WANG Guo,HU Xin-xin,WANG Zhen-da.Effects of removing heavy metals from suspensions separated by soil washing with four flocculants[J].Soils,2012,44(4):639-644. |
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| Authors: | SONG Yong-wei WANG Guo HU Xin-xin WANG Zhen-da |
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| Institution: | College of Resources and Environment, Fujian Agriculture and Forestry University |
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| Abstract: | In order to determine the optimal flocculants and the corresponding dosage, the effects of four flocculants (including aluminum sulfate, polyaluminium chloride, ferrous sulfate and calcium oxide) were studied for removing cadmium, lead, zinc from the suspension containing fine soil particles separated by soil washing process. The concentrations of cadmium, lead and zinc in the suspension were decreased firstly and then increased with the increasing dosage of aluminum sulfate. The concentrations of these three heavy metals were rapidly decreased with the increasing dosage of polyaluminium chloride and calcium oxide. However, when the dosage of ferrous sulfate increased, the concentrations of lead and zinc were decreased, and the concentrations of cadmium rapidly were decreased and then slightly increased. By comparison, the best flocculation dosage of these four flocculants for the flocculation and precipitation of the particles in the suspension were 0.25, 0.04, 1.0 and 0.3 g/L, respectively. When the suspensions treated with the optimal dosage of each flocculants, the concentrations of these three heavy metals were all below the irrigation water quality standards of China. Using the optimal dosage, the cost of flocculant for treating the same volume of suspensions were ferrous sulfate > aluminum sulfate > polyaluminium chloride > calcium oxide. In conclusion, calcium oxide was the optimal flocculants for treating the suspension containing fine particles, and the corresponding optimal pH range was 10 to 11. |
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| Keywords: | Soil washing Suspensions Heavy metals Optimal flocculants Calcium oxide |
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