Can air flotation machine be used for oily sewage

The source of oily sewage is very widespread. In addition to the large amount of oily wastewater discharged from the oil exploration and processing industry, there are also solid fuel thermal processing, wool washing wastewater in the textile industry, tanning wastewater in the light industry, emulsions in the railway and transportation industries, slaughter and food plants, and turning processes in the machinery industry. Next, we will analyze the above hazards of oily sewage and their solutions.

Hazards of oily sewage

The harm of oily sewage is mainly manifested in soil, plant and water.

1. Oily sewage can soak into soil pores to form an oil film, which will block the soil, preventing air and water from seeping into the soil. This is not conducive to the growth of crops, or even kill crops.

2. Oil film will be formed on the water surface after the oily sewage is discharged into the water body, which will hinder the migration of nutrients in the air to the water body and cause the death of aquatic organisms due to serious hypoxia.

3. When oily sewage is discharged into urban sewage pipelines, it will cause adverse effects on pipelines, auxiliary equipment and urban sewage treatment plants. It is generally stipulated that the content of oil and tar shall not exceed 50mg/L when biological treatment method is adopted.

Characteristics of air flotation machine for oily sewage

By analyzing the source and harm of oily sewage, the dissolved gas floatation machine can effectively solve the problem of oily sewage treatment. It has the following characteristics:

1. It has high deoiling efficiency and can separate and remove oil droplets with a diameter greater than 5-10um, especially when the difference between oil and water density is small.

2. If there are suspended solids in the sewage, they can also be removed.

3. Have a certain anti impact load capacity.

4. Due to the need for a set of pressure dissolved gas device, the floor area is relatively large.

5. In order to improve the efficiency of deoiling and solid suspended solids removal, chemical agents are generally required.

6. Scum treatment is relatively troublesome, especially when solid suspended solids and chemical agents are used.

7. In the horizontal flow air flotation or vertical air flotation chamber area, install inclined plate group to increase the floating projection area of bubble floc, reduce the turbulence effect of water flow in the air flotation separation area, and improve the separation efficiency.

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