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| Titel |
Loads Limits Values of Soils with Petroleum Hydrocarbons |
| VerfasserIn |
Mihail Dumitru, Andreea Vladimirescu |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250148121
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| Publikation (Nr.) |
 EGU/EGU2017-12351.pdf |
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| Zusammenfassung |
| The high demand for oil and associated products as a source of energy, resulting in increased
oil exploitation, producing, refining, transportation, storage, marketing and use led to high
levels of environmental pollution.
The optimum bioremediation variant proved to be the one in which fertilizer
(potassium humate in NPK matrix with microelements and 8% monosaccharides) applied
in a 650 l/ha dose was used together with the Zeba absorbent in 32 kg/ha dose,
where the TPH level dropped by 58% in 45 days from the pollution with 3% crude
oil.
Most of these areas are affected by historical pollution.
Many organic contaminants may undergo an ongoing process in the soil, whereby over
time contaminant become less and less subject to decomposition even though relatively can
still be detected in the laboratory analyses.
In Romania about 50.000 ha are polluted with oil and/or brine.
The bioremediation was the main method of rehabilitation. The Regulation on the
assessment of environmental pollution, the following are presented as guide values for total
oil hydrocarbons content in soil:
- normal: less than 100 mg/kg;
- alert values for sensitive soils: 200 mg/kg;
- alert values for less sensitive soils: 1000 mg/kg;
- intervention values for sensitive soils: 500 mg/kg;
- intervention values for less sensitive soils: 2000 mg/kg.
Researches done in laboratory monitored the effect of various concentrations of
oil (under 2000 mg/kg, 3000 mg/kg, 5000 mg/kg, 7000 mg/kg, 10 000 mg/kg)
on germination of wheat seeds at 5 and 7 days after seeding and (fresh and dry)
biomass production after 40 days. Tree experiments were done: one with recently
contaminated light oil, one with recently contaminated heavy oil and one with old
contamination.
After 5 days from sowing, the largest number of germinated seeds was found in the
experiments with old contamination. The fewest germinated seeds was found in the
experience with light oil. The experience with heavy oil showed an intermediate number of
emerged plants.
In all cases fertilization led to a significant increase of the wheat biomass. After 40
days, the level of total hydrocarbons was reduced on average by 55% in the case of
contamination with light oil, by 42% for heavy oil contamination and 12% for old
contamination.
The BTEX concentration in soil had the lowest values in the experiment with heavy oil
contamination, intermediate values in the experiment with historic contamination and higher
values within experiment with light oil. We make proposal to change intervention thresholds
for sensitive land uses from 500 mg/kg for total oil hydrocarbons to 1000 mg/kg for
recently pollution and 2000 mg/kg for old pollution (historical > 5 years). For less
sensitive land uses intervention thresholds from 2000 mg/kg of total oil hydrocarbons,
values increase to 500 mg/kg for recently pollution and 1000 mg/kg old pollution. |
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