A laboratory scale aerobic oxidation ditch combined with an anoxic reactor was conducted to treat wastewater from a chemical industrial park in Tianjin, China. The wastewater exhibited a low biodegradability, and the results of gas chromatography mass spectrometry (GC-MS) analysis showed that some recalcitrant organic components are present in the wastewater. Ammonia nitrogen (NH4-N) removal ef...

We investigated the biodesulfurization potential of a mixed culture AK6 enriched from petroleum hydrocarbons-polluted soil with dibenzothiophene (DBT) as a sulfur source. In addition to DBT, AK6 utilized the following compounds as sulfur sources: 4-methyldibenzothiophene (4-MDBT), benzothiophene (BT), and 4,6- dimethyldibenzothiophene (4,6-DM-DBT). None of these compounds supported the growth o...

Oil is considered the main source of energy, being essential for realization various industrial activities. However, it detrimental to environment, since in addition release polluting gases during combustion, its exploitation involves risks water contamination, through leaks. Petroleum hydrocarbon pollutants are part recalcitrant compounds and their elimination from environment causes enormous ...

Spectrophotometric examinations showed the presence of phenolic compounds in the organic residue collected from four groundwater resources located in vicinity of an oil refinery at the outskirt of Tehran. The average concentration of total phenolic compounds was about 0.38 mg.L-1 in these samples using Folin-Ciocalteu method. GC-Mass analysis disclosed that alkylphenols were the major phenolic ...

In Mexico, the manufacturing of mezcal generates huge amounts of mezcal vinasses (MV), that cause a negative environmental impact. Although there is no specific information for mezcal vinasses, similar effluents have been treated by anaerobic digestion (AnD) usually complemented by oxidative chemical post-treatments such as ozonation. In the present work the post-treatment of anaerobically pret...

Small RNAs, including microRNAs (miRNAs) and small interfering RNAs (siRNAs), are important regulators of plant development and gene expression. The acquisition of high-quality small RNAs is the first step in the study of its expression and function analysis, yet the extraction method of small RNAs in recalcitrant plant tissues with various secondary metabolites is not well established, especia...

Nongenital warts are a common presentation in general practice. Despite treatment according to evidence based guidelines, a significant proportion of common warts fail to resolve, becoming recalcitrant. This poses a problem in clinical management. The recommendations for treating recalcitrant warts are unclear and there is a wide range of second line treatments available. This article reviews t...

Two strains, identified as Rhodococcus wratislaviensis IFP 2016 and Rhodococcus aetherivorans IFP 2017, were isolated from a microbial consortium that degraded 15 petroleum compounds or additives when provided in a mixture containing 16 compounds (benzene, toluene, ethylbenzene, m-xylene, p-xylene, o-xylene, octane, hexadecane, 2,2,4-trimethylpentane [isooctane], cyclohexane, cyclohexanol, naph...

Wastewater from cork processing industry present high levels of organic compounds such as phenolics that must be degraded before discharge into the municipal sewer or into public water courses. The aim of this work was to find out if gamma radiation treatment could increase the biodegradability of recalcitrant compounds using a microbial consortium and a mixed solution of four phenolic acids as...