Tratamento combinado da água produzida de petróleo: filtração, adsorção e foto-Fenton

Abstract

During the exploitation of oil and gas onshore and offshore, it is also simultaneously the production of water commonly called produced water or production water. Produced water (PW) is the that most prominent wastewater because of its large volume and its toxic chemical composition. There are several types of chemical, physical, physico-chemical and biological treatments that can be combined to better efficiency in wastewater treatment. This aims to evaluate the combination of filtration processes, adsorption and photo-Fenton in the removal of oils and greases Total (TOG) and total organic carbon (TOC) in the AP. The filtration had the main goal to reduce the TOG and facilitate adsorption which was chosen as a second step to remove the TOC is to improve efficiency in the fallowing step. The photo-Fenton, aims to remove the remaining load organic from the previous steps. The combined process consists of using a sand filter with mixed grain size (-12 + 16, + 35, -20 + 28 and -12 + 16 mesh), vegetable activated carbon column (activated carbon from babassu bark) and photo-Fenton process which was used in a photochemical reactor of 400 W mercury vapor lamp. The synthetic effluent was prepared from a mixture of components (NaCl, phenol, heptane, xylene, distilled water and oils (15 and 22 API °). The initial effluent was passed into the filter column and adsorption continuously to obtain the least 6 L of partially treated effluent. Then the effluent was taken for the photochemical reactor to degrade the remaining contaminants of the prior processes. Considering the reduction TOG, the combined process and obtained a 98.8% efficiency, with only the filtration step a reduction of 90%. With regard to reduction of the TOC, the overall efficiency of the combined process was 99%, with the steps of absorption and photo-Fenton the greater efficiency. a combination of filtration processes, absorption and photo-Fenton was effective in both reducing the TOG as the TOC reduction of the water produced.