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Control of TPH

Evaluation of suitable remedial targets calls for understanding of Quantitative Risk Assessment and effective liaison with the Regulating bodies. When developing a remedial program it is not generally significant to think in terms of attaining a total clean-up, however to determine the risk that the TPH presents to any receptor, be it human beings, Water, buildings, land or ecosystems. This is effectively a risk assessment approach rather than simply aiming to remove all contaminants regardless of whether they pose a problem. In the moment, it is not acceptable to abandon a site because it looks fine.

The process involved in evaluating, assessing and grading risks should be a presentable and transparent risk assessment framework (Tannenbaum, 2007). The starting point for an assessment of risk of hydrocarbons is, understanding the linkage to the actual pollutant. This requires the identification three components: i. Source– that which has the potential to inflict harm or to pollute controlled environment. ii. Receptor – anything that could be affected by a source, for example people, property, ecological system, or a water system; and iii. Pathway – route by which receptors can be uncovered to, or influenced by, a source.

A risk exists only when the above components are

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within reach. For instance, a leak of a minimum quantity of petroleum (source) from an underground seepage may not amount to considerable risk in a clay soil environment, even if there is a water body (receptor) nearby, because there is no link (pathway) through which the source can move to influence a receptor. Limitations of TPH Risk Assessment Once released to the environment in a spill or leak, petroleum constituents partition, to some extent, between oil phase and the soil, water, and air phases of the environment.

Biological, chemical, and physical processes age the spilled product, leading to additional changes in complexity and composition. Comprehending the toxicology of environmental pollutants in soil is significant if the consequences to health of human beings are to be managed correctly. The toxicological determination of petroleum hydrocarbons is difficult since these chemicals are present in form of complex mixtures, consisting of hundreds of individual elements, each with their own specific toxicological characteristics. Similarly, it is not practical to assess individual elements when present in complex states.

Hence a scientifically practical and sound approach to risk assessment must be protective to human being (Tannenbaum, 2007). Conclusions In spite of the large quantity of hydrocarbons in petroleum products and the widespread nature of petroleum utilization and pollution, only a relative small number of these compounds are well characterized for toxicity. The health effect of some hydrocarbons can be well characterized depending on their components or constituent elements (e. g. , light aromatic fraction-BTEX-benzene, toluene, ethyl-benzene, and xylenes). But, heavier hydrocarbon fractions have far much less characterized elements.

References

Gustafson, J. (2002). Contaminated exposure mode, land assessment, technical & Algorithm. London, R & D Publication. Tannenbaum, L. V. (2007). And So We Model: The Ineffective Use of Mathematical Models in Ecological Risk Assessments, Integrated Environmental Assessment & Management, vol. 3, no. 4, PP. 473-476. Wharfe, J. , Adam, W. , Apitz, S. E. , Barra R. , Bridge, T. , Hickey C. & Ireland S. (2007). In Situ Methods of Measurement-An Important Line of Evidence in the Environmental Risk Framework, Integrated Environmental Assessment and Management, vol. 3, no. 2, pp. 268-275.

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