oil-polluted water It refers to the waste water containing oil discharged in the process of industrial production. According to the size and characteristics of oil particles, they can be divided into dissolved oil, emulsified oil, dispersed oil and floating oil. Dissolved oil is the smallest type of oil particles. Emulsified oil and dispersed oil have certain instability, while floating oil has the largest diameter and can form a lubricating grease film.
In order to effectively treat oily wastewater, appropriate treatment technology should be selected according to the actual characteristics of wastewater. Horizontal screw centrifuge It is suggested to combine gravity and pressure treatment technologies to reduce resource consumption and meet the treatment technical standards. This method of comprehensive utilization technology can improve the production process grade, make the production operation more reasonable, increase the separation efficiency of crude oil, and ensure that the water quality after treatment meets the relevant standards.
It should be noted that the concentration of oil in oily wastewater discharged by different industrial departments is quite different. For example, the oil content of wastewater generated in the oil refining process is about 150 to 1000mg/L, while the tar content of coking wastewater is about 500 to 800mg/L. In this case, Manufacturer of horizontal spiral centrifuge It is recommended that the oil separator be used preferentially to recover the floating oil or heavy oil, so that the treatment efficiency can reach 60% to 80% and the oil content in the effluent is about 100 to 200 mg/L. For emulsified oil and dispersed oil that are difficult to treat, the occurrence of emulsification should be minimized. One method is to take corresponding measures in the production process to reduce oil emulsification in wastewater. In addition, in the process of treatment, try to reduce the number of times to lift wastewater with pumps to reduce the degree of emulsification.
For specific methods of treating oily sewage, air flotation and demulsification are commonly used. The air flotation method realizes oil-water separation by injecting bubbles to float oil particles and form floating oil layers. The demulsification rule is to destroy the structure of emulsified oil particles by adding demulsifiers, so that they can gather and separate oil and water.
Oily sewage treatment is a challenging task, which requires comprehensive application of various technical means according to the actual situation to achieve the goal of efficient treatment and meet environmental requirements.
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