Changes in toxicity during in situ bioremediation of weathered drill wastes contaminated with petroleum hydrocarbons

Vibrio fischeri Bioassay for Determination of Toxicity in Petroleum Contaminated Soils from Tropical Southeast Mexico

“…In the mangrove samples (sites 1, 2 and 3), the toxicity was reduced by roughly one half and was not significantly different from the uncontaminated control (p<0.05). Other authors have also found that natural attenuation and weathering to be effective, as long term means of reducing toxicity (Overton et al 1997;Steliga et al 2012) and have used this bioassay as an indicator. For the sandy coastal soil with pasture (sites 4 and 5), the bioremediation also resulted in a toxicity in the same range as the uncontaminated reference site, which is also congruent with the findings of Adams et al (1996) and Hamzah et al (2010).…”

The ways to increase efficiency of soil bioremediation

“…In the studies, kits of biotests tend to be used, in which the tested organisms belong to different trophic levels (producers, consumers and destruents). Among the ecotoxicological tests, Microtox (Aliivibrio fischeri using bacteria) has proved to be a useful tool in the evaluation of the toxicity of soils contaminated with petroleum hydrocarbons and heavy metals [94,98]. Other tests used for toxicological assessment of soil are: a direct contact test of assessment of acute and chronic toxicity using shellfish Heterocypris incongruens (Ostracodtoxkit™), a test of germination and early plant growth (Phytotoxkit TM).…”

The effects of white-rot fungi Trametes versicolor and Bjerkandera adusta on microbial community structure and functional genes during the bioaugmentation process following biostimulation practice of petroleum contaminated soil

“…Petroleum hydrocarbons have been shaped from various proportions of short, medium and long aliphatics (i.e. alkanes, alkenes), aromatic, and polycyclic aromatic hydrocarbons (PAHs) (Zhang et al, 2011;Steliga et al, 2012). Petroleum sludge is extremely complicated and contains metals, tars, oils and different compositions of petroleum hydrocarbons (Castaldi, 2003).…”