Abstract:

Oil pre-treatment of electric desalting wastewater is a difficult technical problem for crude oil refining industry. This paper introduces the field test by using independent R&D BIPTCFU-III-4 type centrifugal flotation prototype in SINOPEC Cangzhou Company, which is the first time to use centrifugal flotation technology to deal with electric desalting wastewater under harsh conditions. The field test has demonstrated that, when the inlet electric desalting wastewater oil content fluctuates between 7632.8-10 658.0 mg/L, the oil removal efficiency can be reached 95.0% with single-stage CFU and 95.6%-98.6% with two-stage CFUs in series. The outlet oil content can be controlled between 131.8-263.5 mg/L, and can totally meet the quality requirements of the influent of subsequent wastewater treatment processes. The centrifugal flotation technology also has some advantages such as enclosed operation, short hydraulic retention time. It can provide a feasible scheme for dealing with electric desalting wastewater, and deserve further exploration in engineering amplification applications.

Key words: electric desalting wastewater, oil pre-treatment, cyclone-air flotation, oil removal efficiency