Abstract:

To investigate the effectiveness of combining ultrasonic pretreatment with the sequencing batch reactor (SBR) technology in treating swine wastewater, as well as its potential for environmental protection and disease control, ultrasonic pretreatment technology was first applied to improve the biodegradability of the wastewater, followed by further treatment through the SBR system to enhance the removal rates of organic matter, pathogens, and antibiotics. Based on the analysis of wastewater quality indicators including COD, BOD, NH₃-N, TP, and SS before and after treatment, the experimental results showed that after ultrasonic pretreatment, the removal rates of COD, BOD, NH₃-N, TP, and SS reached 20.2%, 25.6%, 25.3%, 21.4%, and 25.0%, respectively. On this basis, after subsequent SBR treatment, the removal rates further increased to 59.7%, 65.6%, 76.9%, 74.7%, and 77.0%, with ammonia nitrogen and total phosphorus showing the most significant improvement. In addition, the combined process achieved total removal rates of 99.75% for pathogens and 98.13% for antibiotics. The synergistic application of ultrasonic pretreatment and SBR technology not only optimizes the wastewater treatment process and improves treatment efficiency, but also plays an important role in environmental protection as well as disease prevention and control.

Key words: ultrasonic pretreatment, sequential batch reactor (SBR), swine wastewater, pathogens, antibiotics