Mn-Cr(Ⅵ)在岩溶水系统内的交互作用

邹胜章; 于晓英; 张国臣; 卢海平; 裴建国

doi:10.3799/dqkx.2012.031

Mn-Cr(Ⅵ)在岩溶水系统内的交互作用

doi: 10.3799/dqkx.2012.031

1.
中国地质大学水资源与环境学院, 北京 100083
2.
中国地质科学院岩溶地质研究所, 广西桂林 541004
3.
中国环境科学研究院, 北京 100012
4.
北京国环清华环境工程设计研究院有限公司, 北京 100084

基金项目:

国家重点基础研究发展计划"973"项目 2011CB201001

中国地质调查局地质调查项目 1212011121166

中国地质科学院岩溶所所长基金 201011

详细信息

作者简介:
邹胜章(1969-), 男, 研究员, 中国地质大学(北京)博士后, 主要从事环境水文地质研究.E-mail: zshzh@karst.ac.cn

中图分类号: X143
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出版历程
- 收稿日期: 2011-09-12
- 刊出日期: 2012-03-15

Cross Action of Mn-Cr (Ⅵ) in Water-Soil-Rock System

1.
School of Water Resources and Environment, China University of Geosciences, Beijing 100083, China
2.
Institute of Karst Geology, CAGS, Guilin 541004, China
3.
Chinese Research Academy of Environmental Sciences, Beijing 100012, China
4.
Beijing Guohuan Tsinghua Environmental Engineering Design & Research Institute Co., Ltd, Beijing 100084, China

摘要

摘要: 采用窄缝槽实验装置, 分别模拟岩溶水系统内单一Mn、Cr(Ⅵ)以及Mn-Cr(Ⅵ)复合体系的动态吸附、物理解吸、化学解吸3个阶段的行为特征, 分析含锰、铬污水对地下水的污染规律及其相互作用.结果表明: 土壤对单一体系Mn的吸附率远大于Cr(Ⅵ), 但两者均以专性吸附为主, 不易活化、迁移; 在复合体系内均出现吸附率降低、解吸率升高, 表现为以物理吸附为主, 易活化、迁移, 从而引起水体重金属污染; 两者表现为显著的协同作用, 但Mn对Cr(Ⅵ)的影响远小于Cr(Ⅵ)对Mn的影响; 在酸性环境下, Mn对Cr(Ⅵ)的化学活性有轻微的抑制作用.
- 重金属 /
- 交互作用 /
- 岩溶区 /
- 水—土—岩系统 /
- 吸附 /
- 解吸 /
- 水文地质 /
- 环境工程
Abstract: Using narrow-slit experimental plants, this paper simulates behavioral features of dynamic adsorption, physical desorption, chemical desorption of single Mn system, single Cr (Ⅵ) system and Mn-Cr (Ⅵ) complex system in karst groundwater system. The results indicate that: (1) Under a single system, soil absorption rate of Mn is much larger than that of Cr (Ⅵ); and the two are of specific-orientated adsorption, and difficult to be activated and migrate; (2) Under complex system, the two metals both show absorption rate reduction, desorption rate increase and easy to be activated, migrate; (3) the two metals both show synergistic action, however the effect of Mn to Cr (Ⅵ) is smaller than that of Cr (Ⅵ) to Mn.
- heavy metals /
- cross action /
- karst area /
- water-soil-rock system /
- adsorption /
- desorption /
- hydrogeology /
- environmental engineering

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图 1 实验装置示意

Fig. 1. The simple equipment picture

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图 2 实验过程中出水重金属浓度变化曲线

Fig. 2. The concentration curves of effluent heavy metals

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表 1 土壤理化性质

Table 1. Physical and chemical properties of the soil

pH	CEC(cmol/L)	TOC(%)	TN(%)	Mn(μg/g)	总Cr(μg/g)	有效N(μg/g)	有效P(μg/g)	有效K(μg/g)	Fe₂O₃(%)	CaO(%)
7.73	28.09	0.30	0.050	80.5	＜0.5	22.0	3.88	35.90	8.78	0.65

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表 2 实验结果

Table 2. Test results

溶液类型	组分	动态吸附		物理解吸		化学解吸
溶液类型	组分	时间(h)	吸附总量(mg)/吸附率(%)	时间(h)	解吸量(mg)/解吸率(%)	时间(h)	解吸量(mg)/解吸率(%)
单一体系	Mn	175	89.6/85.3	68	7.05/7.9	126	0.71/0.8
单一体系	Cr(Ⅵ)	115	32.5/47.1	60	10.8/33.2	84	1.99/6.1
复合体系	Mn	225	21.4/15.9	320	11.19/52.3	45	0.48/2.2
复合体系	Cr(Ⅵ)	250	49.8/33.2	400	31.53/63.3	100	2.79/5.6

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