Removal of emulsified oil from polymer-flooding sewage by an integrated apparatus including EC and separation process

Performance Investigation of an Electrocoagulation Reactor with Electrodes’ Polarity Crossly Oriented in Emulsified Oil Separation

“…(ii) The higher current density is in favor of the generation of fine bubbles with larger quantities, improving the mass transfer process, thus promoting the process of flocs formation. (iii) The contribution of oxidation or charge neutralization effect is strengthened with higher current density, conducive to the subsequent separation process of oil droplets by coagulation or flotation . With respect to the operation with high current density, the increase of oil removal is not significant with the increment of current density.…”

“…With the increasingly rigorous environmental policy applied in industrialized countries, much more focus has been cast on the problem of oily sewage treatment. , Oily sewage composed of produced water, drilling wastewater, and well-flushing wastewater and the sewage from mining areas are produced in large volumes every day. In the middle or late stages of oilfield exploitation, the produced water by secondary oil recovery can account for 80% of total liquid produced, or even up to 90%, making the mining meaningless .…”

“…Oily wastewater with high oil concentration, high COD and BOD content, and multiple chemical additives can be a severe menace to the environment as well as human health if improperly disposed of. , Emulsified oil is one of the contaminants existing in oily sewage that are difficult to deal with for its small particle size and strong stability, and the most commonly used method is chemical coagulation due to its merits of inexpensive equipment, stable performance, and easy control . However, this technology has a high demand for chemical additives and tends to produce a large amount of sludge with high water content, resulting in secondary pollution. , As an alternative, electrocoagulation (EC) technology, characterized as high efficiency, environmentally friendly, and operating automatically, has gained increasing popularity by industry …”

Advances in Raw Material Industries for Sustainable Development Goals

“…Nowadays, the separation of oil and water is still considered as a critical technical problem due to a complex composition and a high content of oily hydrocarbons in wastewaters. The traditional separation methods have low efficiency, high cost, and other types of pollution take place when these methods are implemented (Jiang et al, 2019, Li et al, 2020, Patterson, 1985. The separators are usually the first stage between the oil source (for ex.…”

The experimental study of increasing the efficiency of emulsion separation

“…Therefore, to increase the efficiency of water-oil emulsions stratification at the oil production fields is a very urgent and relevant task. The importance of this task is also high from an ecological point of view -in most cases, the extracted water from emulsions is pumped back into the aquifer, which is an economical way to dispose the large volumes of stratal water, but the quality of this water shall meet the criteria in order to prevent damage to the stratum when pumping back [1][2][3][4].…”