Mechanical emulsion wastewater treatment is a complex and important process. The following are common treatment methods and process flows for this type of wastewater:
1. Common treatment methods
1. Physical treatment method:
Gravity separation: Natural separation using the difference in specific gravity between oil and water, suitable for wastewater with high oil content and large particles.
Air flotation separation: Using the adhesion of microbubbles to emulsified oil droplets, the oil droplets float and separate, improving the oil-water separation efficiency.
Filtration method: Remove suspended matter and oil substances in wastewater through filter media (such as sand, activated carbon, etc.).
2. Chemical treatment method:
Demulsification: Add demulsifiers to wastewater to destabilize emulsified oil and fat and form oil droplets that are easy to separate.
Coagulation: Add coagulants (such as polyferric sulfate, aluminum sulfate, etc.) to condense suspended matter and colloidal particles in wastewater into larger flocs, which are easy to precipitate or filter out.
Neutralization: For wastewater containing acidic or alkaline substances, the pH value is adjusted by adding a neutralizer to make the wastewater neutral or close to neutral.
3. Biological treatment method:
Activated sludge method: Use microorganisms in activated sludge to degrade organic matter in wastewater.
Biofilm method: Use microorganisms on biofilm to degrade organic matter in wastewater.
Anaerobic digestion: Under anaerobic conditions, anaerobic microorganisms are used to degrade organic matter in wastewater to produce energy such as biogas.
2. Process flow
1. Regulating tank: The emulsified wastewater generated irregularly is collected and collected in the regulating tank for homogenization and equalization to provide stable wastewater quality and water volume for subsequent treatment.
2. Demulsification treatment: Add a demulsifier to the demulsification tank to destabilize the emulsified oil in the emulsified wastewater and form oil droplets that are easy to separate.
3. Coagulation and sedimentation: Add coagulants and coagulants to condense the destabilized oil droplets and suspended solids into larger particles, which are removed through sedimentation tanks.
4. Flotation separation: Use flotation devices to separate the condensed oil droplets from the wastewater to form scum, while removing some suspended solids.
5. Biochemical treatment: The wastewater after physical and chemical treatment enters the biochemical treatment system, and the organic matter in the wastewater is further removed by the degradation of microorganisms.
6. Deep treatment: According to the water quality requirements of the wastewater, deep treatment may be required, such as chemical oxidation, adsorption, membrane separation and other technologies to further remove organic matter and heavy metals.
7. Discharge or reuse: If the treated wastewater meets the discharge standards, it can be discharged directly; if the water quality is good, it can also be considered to be reused in certain links of the production process to achieve the recycling of water resources.
III. Precautions
1. Wastewater quality monitoring: During the treatment process, the wastewater needs to be regularly monitored to ensure that the treatment effect reaches the expected goal.
2. Treatment equipment maintenance: Treatment equipment needs to be regularly maintained and serviced to ensure its normal operation and extend its service life.
3. Wastewater reuse safety: If you consider reusing treated wastewater in the production process, you need to ensure that the water quality of the reused water meets the relevant standards and requirements to avoid adverse effects on the production process and product quality.
The treatment of mechanical emulsion wastewater requires the comprehensive use of a variety of technologies and methods to ensure that the wastewater is effectively treated and meets the relevant discharge standards or reuse requirements.
