English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The low solubility and adsorption are two major properties of high molecular weight hydrocarbons that limit their availability to microorganisms. For this reason, the additions of surfactants enhance the solubility and removal of those contaminants. Sometimes, the addition of surfactants into the soil may improve the bioremediation rates. For these propose, this work aimed at evaluating the potentiality of the addition of a biosurfactant, such as a rhamnolipid in a soil contaminated with crude oil. For that, tests of dehydrogenase activity and seed germination with Lactuca sativa and were evaluated with different concentrations of the biosurfactant (0.1 to 1.5g of rhamnolipid for each 100g of soil) to verify whether or not those concentrations would be poisonous to the soil. After the tests, it was verified that the addition of 1.0 and 1.5%w/w of rhamnolipid was poisonous to the soil. The biodegradation tests were carried out in a 20cm of height and 5cm of diameter bioreactors, being used 15 cm of soil bed with 450 g of polluted soil and a 3cm layer of support rock. The tests were run at room temperature, being used a humid airflow of 3L/h. The nutrients were corrected through the addition of ammonium nitrate (NH4NO3) and bihydrogen potassium phosphate (KH2PO4), in a nutritional ratio of C:N:P = 100:15:1, being the humidity adjusted in 50% of the liquid retention capacity. Those experiments were accomplished with different rhamnolipid concentrations varying from 0.1 to 1.5% w/w, besides a control without adding it. The experiments were run for 45 days and TPH (Total petroleum hydrocarbon) removal was evaluated. After finishing the biodegradation tests, an increase of about 57% in the oil biodegradation efficiency was verified when 0.4 of rhamnolipid were used. The addition of the biosurfactant improved the bioremediation rates, except for the experiments with addition of 1.0 and 1.5% w/w that was observed a decrease the bioremediations rates.

Bioremediation of crude oil-bearing soil: Evaluation of rhamnolipid addition as for the toxicity and crude oil biodegradation efficiency