The treatment of petroleum wastewater can effectively prevent the wastewater generated in the oil exploitation from having a huge impact on the environment. It is also necessary to analyze the toxicity in the wastewater, especially the preliminary identification of the biological toxicity characteristics in the wastewater, which can be used for the future. Wastewater treatment provides the main basis for effective wastewater treatment;

The treatment of petroleum wastewater is conducive to the realization of sustainable development, the goal of energy saving and consumption reduction, the protection of the earth's environment, the realization of social development and progress, and the benefit of all mankind.

What are the main technologies of petroleum wastewater treatment?

Oil removal has gravity oil removal: the main principle of this technology in application is to use the gravity difference between oil and water to achieve. Gravity oil removal can remove oil slicks and a large amount of dispersed oil contained in wastewater. From the analysis of the current technology, the application equipment of gravity degreasing mainly includes vertical degreasing tanks, inclined plate grease traps and coarse-grained oil tanks.

Coagulation demulsification and oil removal: After the gravity removal method is implemented, most of the oil contained in the wastewater can be removed, but many oil slicks with relatively small particles still exist in the water. At this time, secondary coagulation and oil removal can be selected. The way to remove oil from the milk is carried out.

In addition to suspended solids, the current technology for removing suspended solids in petroleum wastewater is mainly the filtration process. The most commonly used equipment is the pressure type and the gravity type of the filter tank. The former is made in the factory, the installation can be completed smoothly on the construction site, and the floor area is relatively small, so the current usage is relatively large. At present, there are mainly two types of pressure filter tanks: vertical type and horizontal type. Generally speaking, the diameter is less than 3m. In the horizontal filter tank, because the load of suspended matter in the filtered section is very uneven, there is still a certain scope of application. limitations. At present, in order to improve the treatment effect, many oil fields choose to use two-stage filtration for treatment, which can achieve better treatment effect and avoid further pollution of the environment by wastewater.

With the development of the times and the advancement of science and technology, many researchers have gradually developed new technologies for petroleum wastewater treatment.

The advanced treatment of petroleum wastewater by using the biofilm conforming process method can better apply the activity and biofilm treatment process to comprehensively treat the wastewater, so that the petroleum wastewater can be treated better. Activated sludge treatment provides very good conditions for petroleum wastewater. At the same time, comprehensive application of composite treatment process in practice can achieve better results and provide basic conditions for environmental protection.

The treatment technology using flocculants is also the wastewater treatment technology chosen by many oil companies at present. It is widely used in petrochemical refineries and all aspects of oil production, mainly for the high concentration of organic waste in oil production. , Among them, the wastes mainly emulsified and suspended solids are treated comprehensively, and generally contain a relatively small amount of BOD5/COD and are also difficult to degrade. In order to better reduce the impact caused by the existence of suspended matter, avoid major wear and tear on the equipment, reduce the processing load, improve the processing efficiency, and make the discharged water meet the specified requirements.

The treatment of petroleum wastewater generally uses a combination of aerobic and anaerobic methods. Generally, aerobic organisms are not used alone for wastewater treatment. The currently widely used aerobic treatment methods are as follows:

• Sequencing batch batch activated sludge process;
• High-efficiency aerobic bioreactor;
• Biological contact oxidation;
• Membrane bioreactor;
• Suspended packing bioreactor.