Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil.

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Abstract Text:

Masahiro Isoyama,Shin-Ichiro Wada,Masahiro Isoyama,Shin-Ichiro Wada,

Removal of heavy metals from contaminated soil is not popular because of its high cost. Reducing the bioaccessible heavy metals content to an allowable level by washing with inorganic acids and subsequent immobilization of remained metals may be a low cost option for soil remediation. The applicability of this combined treatment was investigated using three different types of soil, a kaolinitic, a smectitic and an allophanic soil, which were artificially contaminated with Pb. The effectiveness of the treatment was evaluated using two main criteria: (i) reduction of the HCl extractable Pb (bioaccessible Pb) below 150 mg kg(-1), reduction of water extractable Pb below the concentration of 0.01 mg L(-1). These values correspond to allowable levels suggested by the Japanese Ministry of Environment. The soils were washed batch-wise at a solution to soil ratio of 5 L kg(-1) successively with 1 mol L(-1) HCl and 0.1 mol L(-1) CaCl(2) solutions. The two solutions were separated by filtration from one batch and reused for washing the next batch of soil without processing. The Pb concentration in the solutions increased after repeated use and removal efficiency gradually declined. The efficiency of the treatment was highly dependent on the type of soil. In the kaolinitic soil, HCl extractable Pb content of the soil from the first batch was about 50 mg kg(-1) and it exceeded 150 mg kg(-1) in that from sixth batch. But the combined soils from 1st to 10th batches gave bioaccessible Pb content barely below 150 mg kg(-1). For the smectitic soil having higher cation exchange capacity, the acceptable number of times of reuse was estimated to be 4. For the allophanic soil, treatment with the HCl solution was efficient only for the first batch of the soil, and the reuse of the acid solution was found to be ineffective. The application of 50 g kg(-1) of calcite or slacked lime was effective for reducing the water extractable Pb content. To keep soil pH near neutral and secure long term stability, the application of 50 g kg(-1) of calcite and 100 g kg(-1) of allophanic soil was chosen as the best method. This combination of amendments could reduce the water extractable Pb to almost undetectable levels after 3 days of aging.

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Publishing Authors By Initials

M Isoyama,S Wada,M Isoyama,S Wada,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of hazardous materials

VOLUME: 143

Page Numbers: 636-42

Journal Abbreviation:

ISSN: 0304-3894

DAY: 7

MONTH: 01

YEAR: 2007

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 9422688

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil.

AFFILIATION: Kyushu University, Fukuoka 812-8581, Japan.

Country: Netherlands

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Hazard Mater

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil Related Publications

• A comparative study of the plasma membrane permeabilization and fluidization induced by antipsychotic drugs in the rat brain.
• A method for accurate estimation of stimulating sites based on cerebral cortex structure in transcranial magnetic stimulation.
• Alpha 1-adrenoceptor agonists protect against stress-induced death of neural progenitor cells.
• Application to robot control using brain function measurement by near-infrared spectroscopy.
• Arabidopsis TRANSPARENT TESTA GLABRA2 is directly regulated by R2R3 MYB transcription factors and is involved in regulation of GLABRA2 transcription in epidermal differentiation.
• Association between trait anxiety and endothelial function observed in elderly males but not in young males.
• Can Human Isochrony be Explained by a Computational Theory?
• Chloroplast photorelocation movement mediated by phototropin family proteins in green plants.
• Collectrin, a homologue of ACE2, its transcriptional control and functional perspectives.
• Dielectric dispersion of alternating copolymers of maleic acid.
• Dietary Carnosine And Anserine Inhibits High-intensity Exercise-induced Decrease In Rat Sarcoplasmic Reticulum Ca2+ -handling: 2073: Board #143 May 31 3:30 PM 5:00 PM.
• Differential expression of a subunit isoforms of the vacuolar-type proton pump ATPase in mouse endocrine tissues.
• Effect of beta-lactotensin on acute stress and fear memory.
• Effects of heat stress on filamentous actin and prestin of outer hair cells in mice.
• Estimation of force motor command for NIRS-based BMI.
• Functional analysis of the epidermal-specific MYB genes CAPRICE and WEREWOLF in Arabidopsis.
• Glycogen synthase kinase-3beta: homologous regulation of cell surface insulin receptor level via controlling insulin receptor mRNA stability in adrenal chromaffin cells.
• Identification of novel chemical inhibitors for ubiquitin C-terminal hydrolase-L3 by virtual screening.
• Life style-related diseases of the digestive system: from molecular mechanisms to therapeutic strategies: preface.
• Movement time planning in human movement with via-points.
• New method for simultaneous measurement of frequency spectra of complex dielectric constants of polyelectrolyte solutions.
• Preface.
• Remediation of Pb-contaminated soils by washing with hydrochloric acid and subsequent immobilization with calcite and allophanic soil.
• Sodium D(2) resonance radiation in single-pass sum-frequency generation with actively mode-locked Nd:YAG lasers.
• The association between anger-related personality trait and cardiac autonomic response abnormalities in elderly subjects.
• Topological and chronological features of the impairment of glucose metabolism induced by 1-methyl-4-phenylpyridinium ion (MPP(+)) in rat brain slices.
• [Anti-tuberculosis chemotherapy]
• [Diastolic heart failure]
• [New direction of medical malpractice dispute resolution]
• [Teaching surveillance to workers' health in nursing courses]