Enhanced heavy metal immobilization in soil by grinding with addition of nanometallic Ca/CaO dispersion mixture

被引：64

作者：

Mallampati, Srinivasa Reddy ^{[1
]}

Mitoma, Yoshiharu ^{[1
]}

Okuda, Tetsuji ^{[2
,3
]}

Sakita, Shogo ^{[1
]}

Kakeda, Mitsunori ^{[1
]}

机构：

[1] Prefectural Univ Hiroshima, Fac Life & Environm Sci, Dept Environm Sci, Shobara City, Hiroshima 7270023, Japan

[2] Hiroshima Univ, Environm Res, HigashiHiroshima, Hiroshima 7398513, Japan

[3] Hiroshima Univ, Ctr Management, HigashiHiroshima, Hiroshima 7398513, Japan

来源：

CHEMOSPHERE | 2012年 / 89卷 / 06期

关键词：

Enhanced immobilization; Heavy metals; Soil grinding; Soil remediation; Nanometallic Ca/CaO; CONTAMINATED SOILS; POLLUTED SOILS; REMEDIATION; EXTRACTION; REMOVAL; CEMENT; STABILIZATION; SOLUBILITY; PREDICTION; SPECIATION;

D O I：

10.1016/j.chemosphere.2012.06.030

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

This study investigated the use of a nanometallic Ca and CaO dispersion mixture for the immobilization of heavy metals (As, Cd, Cr and Pb) in contaminated soil. Simple grinding achieved 85-90% heavy metal immobilization, but it can be enhanced further to 98-100% by addition of a nanometallic Ca/CaO dispersion mixture produced by grinding. Observations using SEM-EDS elemental maps and semi-quantitative analysis showed that the amounts of As, Cd, Cr, and Pb measurable on the soil particle surface decrease after nanometallic Ca/CaO treatment. The leachable heavy metal concentrations were reduced after nanometallic Ca/CaO treatment to concentrations lower than the Japan soil elution standard regulatory threshold: <0.01 mg L-1 for As, Cd, and Pb; and 0.05 mg L-1 for Cr. Effects of soil moisture and pH on heavy metal immobilization were not strongly influenced. The most probable mechanisms for the enhancement of heavy metal immobilization capacity with nanometallic Ca/CaO treatment might be due to adsorption and entrapment of heavy metals into newly formed aggregates, thereby prompting aggregation of soil particles and enclosure/binding with Ca/CaO-associated immobile salts. Results suggest that the nanometallic Ca/CaO mixture is suitable for use in immobilization of heavy-metal-contaminated soil under normal moisture conditions. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：717 / 723

页数：7

共 43 条

[11] Phosphate-induced metal immobilization in a contaminated site [J].

Cao, RX ;

Ma, LQ ;

Chen, M ;

Singh, SP ;

Harris, WG .

ENVIRONMENTAL POLLUTION, 2003, 122 (01) :19-28

[12] Heavy metal immobilization by chemical amendments in a polluted soil and influence on white lupin growth [J].

Castaldi, P ;

Santona, L ;

Melis, P .

CHEMOSPHERE, 2005, 60 (03) :365-371

[13] Solubility of heavy metals in a contaminated soil: Effects of redox potential and pH [J].

Chuan, MC ;

Shu, GY ;

Liu, JC .

WATER AIR AND SOIL POLLUTION, 1996, 90 (3-4) :543-556

[14] Detoxification and amelioration of heavy-metal contaminated forest soils by means of liming and fertilisation [J].

Derome, J .

ENVIRONMENTAL POLLUTION, 2000, 107 (01) :79-88

[15]

Ganjidoust H, 2009, SCI IRAN TRANS A, V16, P107

[16] Phytoextraction: a cost-effective plant-based technology for the removal of metals from the environment [J].

Garbisu, C ;

Alkorta, I .

BIORESOURCE TECHNOLOGY, 2001, 77 (03) :229-236

[17] Removal of heavy metals from the environment by biosorption [J].

Gavrilescu, M .

ENGINEERING IN LIFE SCIENCES, 2004, 4 (03) :219-232

[18]

Glass DJ, 1999, PHYTOREMEDIATION AND INNOVATIVE STRATEGIES FOR SPECIALIZED REMEDIAL APPLICATIONS, P95

[19] Modelling the leaching of Pb, Cd, As, and Cr from cementitious waste using PHREEQC [J].

Halim, CE ;

Short, SA ;

Scott, JA ;

Amal, R ;

Low, G .

JOURNAL OF HAZARDOUS MATERIALS, 2005, 125 (1-3) :45-61

[20] Heavy metal speciation and leaching behaviors in cement based solidified/stabilized waste materials [J].

Li, XD ;

Poon, CS ;

Sun, H ;

Lo, IMC ;

Kirk, DW .

JOURNAL OF HAZARDOUS MATERIALS, 2001, 82 (03) :215-230

← 1 2 3 4 5 →