PC침목과 과황산염을 이용한 항생제와 중금속 복합오염 지하수 정화 = Groundwater remediation contaminated with antibiotics and heavy metals using calcined prestressed concrete sleepers and persulfate

다국어 초록 (Multilingual Abstract)

Antibiotics and heavy metals that are not removed from livestock wastewater can contaminate soil and groundwater. The simultaneous removal of antibiotics and heavy metals is often challenging due to their distinct removal mechanisms. However, the combined use of hydroxide ions (OH-) and persulfate (PDS) has the potential to simultaneously degrade antibiotics and precipitate heavy metals. Therefore, the PC sleeper was calcined to remove oil contaminants and convert Ca(OH)2 and CaCO3 into CaO. In this study, the potential of calcined PC sleeper was evaluated to remove antibiotics and heavy metals commonly observed in livestock wastewater, sulfamethazine (SMZ), Cu, and Zn. As a result, calcined PC sleepers completely precipitates Cu2+ and Zn2+ spontaneously. Moreover, calcination at 800 ℃ can effectively enhance the hydroxide ions release properties of PC. Furthermore, CPC and PDS can degrade SMZ via hydroxyl radicals generated during PDS alkaline activation. However, under co-contamination with SMZ, Cu2+, and Zn2+, SMZ removal decreased with high CPC dosage, suggesting Cu ions also activated PDS. The lifespan and field applicability of CPC were evaluated using a flow-through experiment. CPC was observed to result in greater removal of Cu2+ and Zn2+ than PC. In addition, 1 kg of CPC and PC were capable of purifying Cu2+ and Zn2+, approximately 1,871 L and 1,497 L, respectively. These results indicate that CPC is an effective alkaline supply material for removing contamination from antibiotics and heavy metals.

목차 (Table of Contents)

• Chapter 1. Introduction 8
• 1.1 Co-contamination of antibiotics and heavy metals in livestock wastewater 8
• 1.2 Limitations of technologies for the treatment of antibiotics and heavy metals 9
• 1.3 Proposed the simultaneous removal technology 10
• 1.4 Calcined waste PC sleepers 12
• 1.5 Research objectives 14
• Chapter 2. Materials and Methods 15
• 2.1 Chemical and Materials 15
• 2.2 Preparation of calcined PC sleepers 16
• 2.3 Experiment 18
• 2.3.1 Batch test 18
• 2.3.2 Column test 18
• 2.4 Analytical methods 19
• Chapter 3. Results and Discussion 20
• 3.1 Cu2+ and Zn2+ removal by PC sleeper or calcined PC sleeper 20
• 3.1.1 Effect of calcination on PC sleeper 20
• 3.1.2 Effect of calcination temperature on PC sleeper 22
• 3.2 Effect of PDS alkaline activation 24
• 3.3 Simultaneous removal of SMZ, Cu2+, and Zn2+ using CPC and PDS 27
• 3.4 Flow-through experiments in column 29
• Chapter 4. Conclusions 34
• References 35