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| DOI：10.13522/j.cnki.ggps.2025290 |
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| Mechanistic insights into the synergistic degradation of aquaculture wastewater by micro-nano bubbles and ultrasound |
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LIU Jinrui, ABDUL Rahim Junejo, LIU Rao, ZHANG Jinqiao, NIU Wenquan
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Mechanistic insights into the synergistic degradation of aquaculture wastewater by micro-nano bubbles and ultrasound
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| Abstract: |
| 【Objective】Micro-nano bubbles (MNBs) and ultrasound have attracted increasing attention in wastewater treatment due to their ability to enhance mass transfer, generate reactive species, and promote pollutant degradation. However, the synergistic mechanisms between these technologies under different application sequences remain poorly understood. The objective of this paper is to investigate the synergistic effects of MNBs and ultrasound under different application sequences.【Method】The experiment consisted of six treatments: a control (CK), applying micro-nano bubble alone (NA), applying ultrasound alone (UL), simultaneous application of micro-nano bubbles and ultrasound (NAUL), and two sequential applications: NA-UL and UL-NA. The influence of each treatment on the size, concentration and zeta potential of MNB, as well as the removal efficiency of composite pollutants was measured and evaluated.【Result】Among all treatments studied, the NA-UL sequential treatment was the most effective. It significantly optimized bubble characteristics, reducing the median diameter to 121 nm and increasing the dissolved oxygen concentration by 118.62% compared with the control. In this treatment, chromium and zinc removal efficiencies reached 90.72% and 43.12%, respectively, and chemical oxygen demand and five-day biochemical oxygen demand removal rates reached 32.78% and 35.20%, respectively, and fecal coliform inactivation reached 60.26%. The removal of total phosphorus, total potassium and total nitrogen was primarily attributed to their interfacial adsorption by micro-nano bubbles and biologically mediated transformations enhanced by elevated dissolved oxygen concentration.【Conclusion】Temporal regulation of micro-nano bubbles and ultrasound can improve their synergistic performance. The results indicate that the NA-UL sequence is the most energy-efficient strategy for enhancing the treatment of complex pollutants in aquaculture wastewater recycling systems. |
| Key words: micro-nano bubbles; ultrasonic wave; compound pollutants; hydroxyl radical; aquaculture wastewater |
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