猪粪及蚓粪对Cu和Zn吸附行为的比较研究.pdfVIP

农业环境科学学报 ２００9,28(2):280-286 Ｊｏｕｒｎａｌ ｏｆ Ａｇｒｏ-Ｅｎｖｉｒｏｎｍｅｎｔ Ｓｃｉｅｎｃｅ Cu Zn 猪粪及蚓粪对 和 吸附行为的比较研究 朱维琴，贾秀英，李喜梅，刘 薇 （杭州师范大学生命与环境科学学院，浙江杭州 310036） 摘 要：采用室内试验方法，比较研究了猪粪和蚓粪对Cu2+ 、Zn2+ 的吸附、解吸规律及吸附动力学行为。结果表明，在试验浓度范围 内，猪粪和蚓粪对Cu2+ 、Zn2+ 的吸附量均随着Cu2+ 、Zn2+浓度的增加而增加，蚓粪对Cu2+ 、Zn2+ 的吸附固定能力明显高于猪粪。猪粪和蚓 粪对Cu2+ 、Zn2+ 的吸附等温线与Freundlich 和Henry 方程均有较好的拟合性。猪粪和蚓粪中Cu2+ 、Zn2+ 的解吸量随着吸附量的增 大而增加，在相同初始浓度条件下，猪粪吸附的Cu2+更易被解吸，而猪粪和蚓粪对Zn2+ 的解吸能力相近。猪粪和蚓粪对Cu2+ 、Zn2+ 的 吸附速率均较快，10~30 min 之内可以达到平衡后吸附总量的90% 以上；一级动力学方程是描述Cu2+ 、Zn2+在猪粪和蚓粪中吸附动力 学过程的最优模型，且蚓粪对Cu2+ 、Zn2+ 的吸附速率明显高于猪粪。 关键词：猪粪；蚓粪；吸附；解吸；Cu；Zn 中图分类号：X713 文献标志码：A 文章编号：1672- 2043(2009)02- 0280- 07 Adsorption Behaviour of Copper and Zinc on Pig Manure and Its Vermicompost ZHU Wei-qin, JIA Xiu-ying, LI Xi-mei, LIU Wei （College of Life and Environmental Science, Hangzhou Normal University, Hangzhou 310016, China） Abstract ：Copper and zinc are the commonly-occurring micronutrients used in pig manures since their anti-microbial and growth-stimulat－ ing effects. As the end product of using earthworm to break down pig manure, vermicompost has much larger surface area mainly because of the increased decomposition and humification during earthworm treatment period. Since both pig manure and its vermicomposts are organic wastes and can be used as organic fertilizers for agricultural soils, they may have some different effects on the behaviour of the existed copper and zinc. In this paper, Cu2+ and Zn2+ adsorption behaviour on pig manure waste and its vermicompost were studied. The results showed that Cu2+, Zn2+ adsorption increased with the initial Cu2+, Zn2+ concentration and vermicompost had a much higher Cu2+ and Zn2+ adsorption capaci－ ty than pig manure. The adsorption isotherm of Cu2+ , Zn2+ by the absorbent could significantly conform to Freundlich and Henry equations. Cu2+ and Zn2+ desorption by these two absorbent increased with their increasing adsorption amount.