环境保护论文代写:After effects of man-made chemicals
Soil contamination is the aftereffects of man-made chemicals or other alteration in the natural soil environment. It typically arises from the rupture of underground storage tanks, application of pesticides, and percolation of contaminated surface water to subsurface strata etc.
The most common chemicals involved are solventspetroleum hydrocarbons, pesticides, lead and other heavy metals. This occurrence of this phenomenon is mutually associted with the grade of industrializations and intensities of chemical usage.
The concern over soil contamination originates primarily from health risks, from direct contact with the contaminated soil, vapours from the contaminants, and from secondary contamination of water supplies within and underlying the soil.
Following are the objectives:
- To understand the action of soil contamination.
- To study the cause, effects and control measures of soil contamination.
- To study various remediation technology available for soil contamination.
- To test soil specimen for shear strength using Direct Shear Test
- Depending upon the contaminant of the soil specimen, to provide a remedial solution for the soil contamination.
2. SOIL CONTAMINATION: CAUSES AND EFFECTS
2.1 Soil Contamination
Soil contamination is the occurrence of pollutants in soil beyond a certain level causing a declination of one or more soil functions. Thus a reliable baseline and background concentrations of contaminants have to be determined.
2.2Classification of hazardous substances
Various toxic and hazardous substances are responsible for the soil contamination and degradation. Indication of these hazardous substances is of paramount importance so as to find the remedial measures. There are 3 classes specified as follows:
2.3 Causes of Soil contamination
Soil can be contaminated by natural conditions or human activities. Contamination of soils is, generally, a result of careless use of oil and chemicals.Mostly human activities are responsible for widespread contamination. Few of the causes of the soil contamination as a result of human activities as follows.2
- Improper and irresponsible waste disposal&Uncontrolled waste water disposal
- Incorrect storage of products and/or waste in industrial activities
- Road accidents in goods transport
- Leaks from tanks or faulty operations
- Unlimited and improper use of pesticides
- Uncontrolled air pollution