Experimental study on treatment of heavy metal–contaminated soil by manganese-oxidizing bacteria

2021 ◽  
Author(s):  
Mengbo Liu ◽  
Shengli Wang ◽  
Meng Yang ◽  
Xiang Ning ◽  
Zhongren Nan
Keyword(s):  
Heavy Metal ◽  
Experimental Study ◽  
Contaminated Soil

scholarly journals Experimental Study on Solidification and Stabilization of Heavy-Metal-Contaminated Soil Using Cementitious Materials

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4999
Author(s):  
Xiaojun Li ◽  
Ruizhi Yang ◽  
Hao Li ◽  
Hao Yi ◽  
Hongjun Jing
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Experimental Study ◽  
Contaminated Soil ◽  
Performance Test ◽  
Cementitious Materials ◽  
Curing Agent ◽  
New Type ◽  
Hydrated Products ◽  
Cementing Material

In order to solve the shortcomings of the traditional curing agent in the treatment of composite heavy-metal-contaminated soil with the solidification and stabilization method, a new type of cementing material A was used as a curing agent, and the Pb, Cd, Cu composite heavy-metal-contaminated soil was artificially prepared to carry out an experimental study on solidification and stabilization (SS) restoration by the mechanical properties test, leaching performance test, and microscopic test. The results show that in the range of test dosage, with the increase in the curing agent content, the unconfined compressive strength of the solidified body increased, and the resistance to deformation was enhanced. From the perspective of leaching characteristics, the new curing agent A had an excellent curing effect on the composite heavy-metal-contaminated soil. To achieve safe disposal, a curing agent content of 10% applies only for the soil heavily contaminated by heavy metals. The curing agent A could significantly reduce the content of acid-extractable heavy metals after solidifying the heavy metal Pb, Cd, and Cu composite contaminated soil and effectively converted it into a residue state. The solidified phase contained hydrated products such as calcium silicate hydrate (CSH) and ettringite (AFt). These hydrated products can inhibit the leaching performance of heavy metal ions through adsorption, encapsulation, and ion exchange. The study provides a feasible method and reference for the solidification, restoration, and resource utilization of heavy-metal-contaminated soil in the subgrade.

An Experimental Study on Geotechnical and Electrical Properties of an Oil-Contaminated Soil at Thi-Qar Governorate/Iraq

2019 ◽  
Vol 10 (3) ◽  
pp. 148
Author(s):  
Nesreen Kurdy Al-Obaidy ◽  
Assad Al-Shueli ◽  
Hawraa Sattar ◽  
Zainab Majeed ◽  
Noor Al Huda Hamid
Keyword(s):  
Experimental Study ◽  
Electrical Properties ◽  
Contaminated Soil

scholarly journals Application of nanoscale zero-valent iron in hexavalent chromium-contaminated soil: A review

2020 ◽  
Vol 9 (1) ◽  
pp. 736-750
Author(s):  
Xilu Chen ◽  
Xiaomin Li ◽  
Dandan Xu ◽  
Weichun Yang ◽  
Shaoyuan Bai
Keyword(s):  
Heavy Metal ◽  
Hexavalent Chromium ◽  
Contaminated Soil ◽  
Zero Valent Iron ◽  
Toxic Heavy Metal ◽  
Factors Affecting ◽  
Metal Pollutants ◽  
Nanoscale Zero Valent Iron ◽  
Low Toxicity ◽  
Heavy Metal Pollutants

AbstractChromium (Cr) is a common toxic heavy metal that is widely used in all kinds of industries, causing a series of environmental problems. Nanoscale zero- valent iron (nZVI) is considered to be an ideal remediation material for contaminated soil, especially for heavy metal pollutants. As a material of low toxicity and good activity, nZVI has been widely applied in the in situ remediation of soil hexavalent chromium (Cr(vi)) with mobility and toxicity in recent years. In this paper, some current technologies for the preparation of nZVI are summarized and the remediation mechanism of Cr(vi)-contaminated soil is proposed. Five classified modified nZVI materials are introduced and their remediation processes in Cr(vi)-contaminated soil are summarized. Key factors affecting the remediation of Cr(vi)-contaminated soil by nZVI are studied. Interaction mechanisms between nZVI-based materials and Cr(vi) are explored. This study provides a comprehensive review of the nZVI materials for the remediation of Cr(vi)-contaminated soil, which is conducive to reducing soil pollution.

The Study of Remediation Standards of Heavy Metal-Cu Contaminated Soil Based on Risk Assessment

2011 ◽  
Vol 414 ◽  
pp. 93-98
Author(s):  
An Ping Liu ◽  
Xiao Nan Sun ◽  
Fang Yang ◽  
Xing Xing Yao
Keyword(s):  
Risk Assessment ◽  
Heavy Metal ◽  
Soil Remediation ◽  
Contaminated Soil ◽  
Assessment Model ◽  
Risk Assessment Model ◽  
Oral Ingestion ◽  
Cu Contamination ◽  
Standard Value ◽  
Exposure Methods

This paper describes the model of heavy metal-Cu contaminated soil remediation standard value based on risk assessment. In the Cu contamination risk assessment model, the main exposure methods are oral ingestion and inhalation through breathing, which not only simplifies the calculation but also make people get a clearer understanding of the way of Cu contamination. We get the simplified formula, calculate and discuss Cu contaminated soil remediation target value in specific parameters to provide reference and basis for the remediation of Cu contaminated soil.

Mobility of Zinc in Heavy Metal Contaminated Soil after Compost Amendment and Brassica juncea Harvest

2014 ◽  
Vol 641-642 ◽  
pp. 1141-1145 ◽  
Author(s):  
Hong Li Huang ◽  
Lin Luo ◽  
Jia Chao Zhang ◽  
Pu Feng Qin ◽  
Man Yu ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Brassica Juncea ◽  
Contaminated Soil ◽  
Water Soluble ◽  
Residual Fraction ◽  
Mobility Factor ◽  
Zn Concentration ◽  
Compost Amendment ◽  
Exchangeable Fraction ◽  
Mn Oxides

Pot experiments were performed to investigate the effect of compost amendment on the mobility of zinc through analysis of Zn fractions in heavy metal contaminated soil. The results showed that the total Zn concentration decreased 8.11%, 10.15%, 16.15%, 20.05%, 7.28% and 5.02% after the amendment of 0, 20, 40, 60, 80, 100 g/kg compost to soil and Brassica juncea harvest, respectively. Zn was mostly concentrated in the residual fraction and Fe-Mn oxides fraction in soil. The percentage of Zn in water-soluble fraction, organic fraction and residual fraction had no correlation with the amount of compost amendment. The percentage of Zn in the exchangeable fraction decreased and the percentage of Zn in Fe-Mn oxides fractions increased obviously. Furthermore, the mobility factor of Zn decreased significantly from 19.20% without compost amendment to 19.09%, 18.70%, 18.15%, 16.45% and 16.12% after the amendment of 0, 20, 40, 60, 80, 100 g/kg compost to soil, the compost amendment could lowered the mobility and phytotoxicity of zinc through bound to Fe-Mn oxides.

Cultivar-specific differences in heavy metal (Cd, Cr, Cu, Pb, and Zn) concentrations in water spinach (Ipomoea aquatic ‘Forsk’) grown on metal-contaminated soil

2014 ◽  
Vol 386 (1-2) ◽  
pp. 251-262 ◽  
Author(s):  
BaoYan He ◽  
Ling Ling ◽  
LuYin Zhang ◽  
MengRun Li ◽  
QuSheng Li ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Contaminated Soil ◽  
Water Spinach ◽  
Ipomoea Aquatic ◽  
Heavy Metal Cd
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