Case Study: Coking Plant Wastewater Treatment
Pollution Issue:
The wastewater from the coking plant contains a high concentration of pollutants, including **Benzo(a)pyrene** and other harmful substances, posing significant environmental risks.
Solution:
To address this issue, Cationic Polyacrylamide (CPAM) was introduced for sludge flocculation treatment. This solution effectively compresses the sludge containing Benzo(a)pyrene and other pollutants into **sludge cakes**, preventing secondary pollution and ensuring safer disposal.
Treatment Process:
The wastewater treatment at the coking plant is divided into four stages:
1. Pre-treatment: Initial removal of large particles and contaminants.
2. Biological Treatment: Degradation of organic pollutants using microbial processes.
3. Coagulation Treatment: Use of chemicals to aggregate fine particles for easier removal.
4. Sludge Treatment: Concentration and dewatering of sludge for final disposal.
Traditional vs. Improved Sludge Treatment:
- Traditional Method:
- Sludge from the flotation process, tar deposits, and excess sludge from the aeration tank were collected in a sludge thickening tank.
- The sludge was left to settle naturally for 2-3 days before being transferred to a drying field for further natural drying.
- This method was time-consuming and required significant space.
- Improved Method:
- Cationic Polyacrylamide (CPAM) is added to the sludge, enabling rapid sedimentation.
- The dewatered sludge is then compressed into **sludge cakes** using a sludge dewatering machine.
- This approach significantly improves treatment efficiency and reduces the need for large drying areas.
Results:
- Enhanced Efficiency: Faster sludge treatment and reduced processing time.
- Space Optimization: Minimized land usage for sludge drying.
- Environmental Protection: Effective containment of harmful pollutants like Benzo(a)pyrene, preventing secondary contamination.
Conclusion:
By integrating Cationic Polyacrylamide (CPAM) into the sludge treatment process, the coking plant has achieved a more efficient, cost-effective, and environmentally friendly wastewater treatment system. This case demonstrates how innovative solutions can address industrial pollution challenges while optimizing operational efficiency.
