رسائل ماجيستير
English
2022
Demulsification of Synthetic Petroleum Wastewater Using Electrocoagulation /Electroflotation Technique
علاء نور غانم الموسوي, عقيل طالب كاظم
كلية الهندسة-جامعة بابل · العراق
This research deals with the demulsification of oily wastewater effluents of petroleum refineries using hybrid electrocoagulation/electroflotation (EC/EF) techniques. A dynamic flow system was constructed using an improved design of a compact electrochemical reactor made of (Perspex glass) containing two parallel vertical sheets as electrodes. A galvanostatic transient technique for two types of electrodes, Al-Al and Al-C felt, were used to achieve the hybrid (EC/EF) treatment in one reactor. Emulsified synthetic wastewater was prepared by mixing crude oil (0.1, 0.2 and 0.3 gram) per liter deionized water and 0.05 g/L sodium dodecyl was added as an emulsion stabilizing agent and sodium chloride at a concentration of 1.5 g/L to increase the electrical conductivity. Electrocoagulation produces Al3+ ions by corroding sacrificial anodes, releasing active coagulant precursors into the solution. Furthermore, the release of finely dispersed H2 gas bubbles at the cathode causes flocs to lift to the upper surface of the solution. All experiments were carried out in continuous operation for two hours with a variety of operating conditions, including initial O/W concentration, current density, volumetric flow rate, and cathode type. Results revealed that for an initial O/W emulsion of 100 ppm and 30 mA/cm2 current density with different solution flow rate of 2, 4 and 6 L/hr the COD removal efficiency was 96.93, 89.07 and 84.11% for Al-Al electrodes and 99.8, 98 and 83.73% for Al-Carbon felt, respectively. These parameters reduced the turbidity of the wastewater. The specific electrical energy consumption (SEEC) and the current efficiency (CE) for the demulsification experiments were also studied. The total operating cost (TOC) of the process was estimated at 1.5255 and 0.65383 US$/m3 of treated oily wastewater for the Al electrodes and Al-Carbon-felt electrodes, respectively.