Sequencing batch airlift reactors (SBAR): a suitable technology for treatment and valorization of mineral oil wastewaters towards lipids production.

Produced water (PW) and spent oil-based wastewaters are some of the largest mineral oil wastewaters produced. Due to the high toxicity of hydrocarbons, several countries set stringent discharge limits and its treatment is compulsory before discharge. In this work, biological treatment of mineral oil wastewaters coupled with the production of bacterial lipids is demonstrated in sequential batch airlift reactors (SBAR).

Conversion of waste cooking oil into biogas: perspectives and limits.

Each year, large quantities of waste cooking oils are produced worldwide which are currently reused mainly for biodiesel production. Since lipids have a very high potential for biomethanation, the production of biogas is a possible alternative for the recycling of edible used oils. The digestion of fats is hindered mainly by their hydrophobicity, which implies a biphasic system with problems of floating and foaming of the oily materials, and by the accumulation of long-chain fatty acids, which are toxic to microbial consortia.

Pig slurry improves the anaerobic digestion of waste cooking oil.

Recycling of waste cooking oil greatly reduces the environmental impact of its disposal. As fats can give rise to high methane yields, the use of waste cooking oil for biogas production seems a promising solution. The aim of this work was to test the anaerobic digestion performances of waste cooking oil in co-digestion with pig slurry, the fat degradation dynamics and the relationships between digestion performances and pig slurry compositional properties.