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Soil heavy metals Cd, Cu, and As Pollution Assessment and Restoration Technology

Author: LiPeng
Tutor: LiZuo
School: Wuhan University of Technology
Course: Environmental Engineering
Keywords: Soil Heavy metal pollution Evaluate Improved materials Repair
CLC: X53
Type: Master's thesis
Year: 2011
Downloads: 358
Quote: 0
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Abstract

Soil is an important part of the natural environment is the basis for agricultural production. Heavy metal pollution is a major global environmental problem facing the mining industry surrounding farms growing heavy-metal contamination of the moment, to strengthen the agricultural soils monitoring, evaluation and remediation technology research, for the moment the comprehensive management of heavy metal pollution of farmland have a positive significance. In this paper, two villages in eastern Hubei farmland around a Smelter as the study area, the sampling survey and evaluate the study area, soil Cd, Cu, As, Pb, and Zn pollution status; while taking the field soil for maize pot experiment was carried out the improved materials C, improved material P, improved materials and improved material M H IV improved materials technology for the remediation of polluted soil research. The results showed that: 1. Two study area, in addition to Pb, Zn outside, Cd, Cu and As all values exceed the national \-6.39mg/kg; Cu :53.2-231 .9mg/kg; As :19.3-175 .5mg/kg; Pb: 51.2 ~ 290.5mg/kg and Zn: 30.1 ~ 274.2mg/kg, including Cd, Cu and As samples excessive rates were 100%, 92% and 80%; According Nemerow index analysis, two survey area belong to severe pollution of farmland. (2) to the paddy fields, dry types of potting soil improvement material added to C, improved materials P, improve material M, the soil conductivity and pH value increased in varying degrees. When the dosage of 20g/kg, putting improved materials C, improved materials and improved material M P average soil pH, improve two 0.82,1.25 and 1.12 units, improved material H is added, resulting in an average pH value of the soil types down 0.25 units. Different dosing treated soil pH in order of: improved materials P gt; improved material M gt; improved materials C gt; CK gt; improved material H. 3 Different improved materials added, improved materials and improved material P C in the two types of potting soil exchangeable Cd concentration was significantly cuts, improved materials and improved material P H to some extent reduce the carbonate-bound Cu content, improved the two types of soil material H As there is a certain lower effective state action; four kinds of modified material added to increase the Cd, Cu and As manganese oxidation state, bound to organic matter and residual distribution ratio; improved materials and improved material M P dosing on paddy soil Cd, Cu restoration was better than dry soil. 4 four kinds of improved materials added, potted corn plants either height or biomass has increased significantly; planting potting soil in two corn on the aerial parts of the plant have been effectively cut heavy metal content, including dryland corn samples, each group corn aboveground Cd, Cu and As content reduction effect order: improved material M gt; improved materials P gt; improved materials C gt; improved materials H, improved material C gt; improved material M gt; improved materials P gt; improved materials H, improved materials H gt; improved materials C gt; improved materials P gt; improved material M; paddy corn samples in each group corn aboveground Cd, Cu and As content of the order reduction effect: improved materials P gt; improved Material H gt; improved material M gt; improved materials C, improved material P gt; improved materials C gt; improved materials H gt; improved material M, improved material P gt; improved materials C gt; improved material M gt; improved material H ; corn aboveground plant Cd, Cu, As for the standard reduction comprehensive analysis, obtained the best dosage of improved materials were: improved materials C10 g / kg, improved materials P 20g/kg, improved material M 20g / kg and improved materials H10g/kg. 5 Correlation analysis showed that the two types of potting soil exchangeable Cd, Cu and corn aboveground Cd, Cu content showed a significant positive correlation; upland soil pH and exchangeable Cd, Cd concentration in corn shoots was a significant positive correlation; As paddy corn aboveground and underground parts As content was significantly positively correlated with the same dryland corn, underground parts As with soil pH levels showed a significant negative correlation. 6 Studies show that improved material C, improved material P, improved materials and improved material M H, heavy metal pollution in the study area has good soil improvement effect repair. Improved materials and improved material P H for Cd, As contaminated paddy soil improved with better effect, and improved materials and improved material M C is more suitable for remediation of Cd, Cu contaminated upland soil.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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