Treatment Methods for Oil-Containing Wastewater from Waste Tire Pyrolysis

Treatment Methods for Oil-Containing Wastewater from Waste Tire Pyrolysis

The treatment is divided into pre-treatment and advanced treatment, with effluent required to meet discharge standards or be recycled:

1. Pre-treatment (Oil removal & demulsification)

Gravity separation: Removes 60%-80% free oil via oil separator by density difference; basic and low-cost.

Dissolved Air Flotation (DAF): Microbubbles adsorb fine oil droplets for separation; effective for emulsified/dispersed oil.

Demulsification: Breaks emulsification with demulsifiers, ultrasound or electrolysis; improves subsequent oil removal efficiency.

2. Advanced treatment (Pollutant degradation & water purification)

Biological treatment: Mainstream process; degrades organics (COD/BOD) via anaerobic-aerobic reactions; stable and low-cost.

Membrane separation: Removes oil and organics with UF/NF membranes; high-quality effluent for direct reuse, but high membrane cost.

Advanced Oxidation Process (AOP): Decomposes refractory organics with ozone/Fenton reagent; suitable for high-concentration wastewater.

3. Terminal disposal

Treated wastewater must meet Integrated Wastewater Discharge Standard (GB 8978-1996) or stricter local standards, and can be recycled for cooling/equipment cleaning.