How to treat wastewater from PP/PE PET washing lines?

 How to treat wastewater from PP/PE PET washing lines?

In the plastics recycling industry, much attention is focused on the crushing, 

washing, and pelletizing processes. However, there's an equally important yet 

often overlooked component: wastewater treatment.

A PP/PE washing line can generate tons or even hundreds of tons of wastewater daily. 

Directly discharging this wastewater not only pollutes the environment but also 

impacts the company's sustainability image. So where does this wastewater 

come from, and how should it be treated?

Our machine is a wastewater treatment system designed for the washing line of 

waste plastic PP, PE, PET products and films. It is very suitable for the wastewater 

treatment needs of the plastic recycling industry.

It can effectively remove suspended matter, grease and organic matter in the 

wastewater. Thereby reducing the concentration of pollutants in the water and 

ensuring that the wastewater meets the discharge standards.

💧 Wastewater Sources

During the washing process, wastewater primarily comes from:

1️⃣Friction washers and rinsing tanks—contain impurities such as mud, oil,

 and label adhesive residue;

2️⃣Hot wash sections—contain surfactants, cleaning agents, and organic 

matter dissolved in plastics;

3️⃣Rinsing and dewatering sections—contain fine plastic particles and 

suspended solids.

This wastewater is typically turbid, alkaline, and has an odor. If left untreated, 

it can cause serious water pollution.

⚙️How to Treat?

1️⃣Pretreatment System:

Dosing system

Coagulation reaction tank

2️⃣Sedimentation System:

Sedimentation area

3️⃣Filtering System:

Sand filter tower(Quartz sand)

Activated carbon filter tower(nutshell activated carbon)

4️⃣Sludge Filter Press System:

Plate and frame filter press

🌿 Why choose supporting wastewater treatment equipment?

✅ Energy saving and consumption reduction: Recycle water to reduce new 

water consumption;

✅ Environmental compliance: Meets emission standards;

✅ Automatic operation: PLC intelligent control, easy maintenance;

✅ Flexible customization: Design solutions based on different production 

volumes and pollution levels.

  Welcone to Contact Us!