研究报告
高思佳,王昌辉,裴元生.热活化和酸活化给水处理厂废弃铁铝泥的吸磷效果[J].环境科学学报,2012,32(3):606-611
热活化和酸活化给水处理厂废弃铁铝泥的吸磷效果
- Effects of phosphate removal by thermal- and acid-activated ferric and alum water treatment residuals
- 基金项目：国家自然科学基金(No. 50979007);国家高技术研究发展计划项目(No. 2008AA06Z301)
- 作者
- 单位
- 高思佳
- 北京师范大学环境学院,教育部水沙科学重点实验室,北京 100875
- 王昌辉
- 北京师范大学环境学院,教育部水沙科学重点实验室,北京 100875
- 裴元生
- 北京师范大学环境学院,教育部水沙科学重点实验室,北京 100875
- 摘要：探讨了酸活化和热活化方式对给水厂废弃铁铝泥(ferric and alum water treatment residuals,FARs)吸附磷能力的影响.结果表明,酸活化和热活化均能提高FARs的磷吸附能力,其中经2 mol·L-1 HCl酸活化的FARs(AH2.0-FARs)和300 ℃热活化的FARs(H300-FARs)取得最好的磷吸附效果.结合SEM和XRD表征技术对活化机制分析得知,两种活化方式均会使FARs变得疏松、多孔,从而提高FARs对磷的吸附能力.Langmuir和Freundlich两种模型均可很好 地反映活化前后FARs的等温吸附过程,FARs对磷的理论饱和吸附量由活化前的20.48 mg·g-1分别增加到22.86 mg·g-1(AH2.0-FARs)和29.66 mg·g-1(H300-FARs).低pH值有利于FARs对磷的吸附.此外,解吸附实验结果表明活化后的FARs能够更好地固定磷.因此,活化后的FARs是一种相对更好的磷的吸附材料.
- Abstract：In this study, the methods of thermal and acid activation were used to improve phosphate (P) adsorption capability on ferric and alum water treatment residuals (FARs). The optimal conditions were determined as thermal activation at 300 ℃ and hydrochloric acid activation at 2 mol·L-1. According to the results of SEM and XRD analysis, higher P adsorption capability of the activated FARs was caused by the increased porosity. Both Langmuir model and Freundlich model could describe the process of P adsorption well. The maximum P adsorption capacities of the AH2.0-FARs and H300-FARs were 22.86 mg·g-1 and 29.66 mg·g-1, respectively, whereas only 20.48 mg·g-1 for the raw FARs. Low pH was favorable for P adsorption by the raw and activated FARs. Results of desorption studies further indicated that the P-binding ability of the FARs was enhanced after activation. Therefore, the activated FARs are more suitable for P adsorption.
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