Today, the use of pharmaceuticals and personal care products (PPCPs) has increased significantly due to an aging population and improved quality of care. In particular, thousands of tons of pharmaceuticals are produced worldwide every year, and they are widely used in agriculture and aquaculture, as...
Today, the use of pharmaceuticals and personal care products (PPCPs) has increased significantly due to an aging population and improved quality of care. In particular, thousands of tons of pharmaceuticals are produced worldwide every year, and they are widely used in agriculture and aquaculture, as well as in the treatment of diseases in humans and animals. After use, these PPCPs flow into wastewater treatment plants through industrial sites, hospital wastewater, and livestock wastewater, and trace pollutants that are not properly treated are eventually discharged into the environment through wastewater. Residual antibiotics can continue to pose a threat to the ecosystem, such as growth inhibition of microorganisms and resistance problems, even at low concentrations. Therefore, controlling residual antibiotics in wastewater is essential to maintaining the health of humans and ecosystems. Also, because wastewater has a high concentration of nitrogen and phosphorus, it can supply excess nutrients to the water system and cause eutrophication. Eutrophication can cause catastrophic social problems such as the destruction of ecosystems and the loss of freshwater resources. In these circumstances, membrane filtration photobioreactor (MPBR) is a potential alternative to treat residual antibiotics by increasing the efficiency of wastewater treatment and maintaining high concentrations of microalgae through a combination of biological treatment with microalgae and physical treatment through membranes. Therefore, this study evaluated the feasibility of simultaneously achieving the removal of residual antibiotics in wastewater, effective wastewater treatment, and biomass recovery using a microalgae-based continuous membrane photobioreactor. For the experiment, erythromycin, a macrolide antibiotic widely used in human and veterinary medicine, was selected as a target antibiotic. In addition, growth inhibition of microalgal biomass and changes in wastewater treatment performance were evaluated in each HRT (hydraulic retention time) in the presence of erythromycin. As a result of the experiment, rapid growth of microalgae was observed in all groups, demonstrating the potential for biomass production in wastewater. But, in the ERM group with erythromycin, a decrease in the dry weight and chlorophyll-a content of microalgae was observed. This growth inhibition is speculated that the environmental stress of microalgae that occurs when erythromycin is present leads to an increase in ROS (reactive oxygen species), which causes the oxidation of intracellular pigments and membrane lipids, and finally photosynthesis and cell growth inhibition. The removal efficiency of total organic carbon (TOC), nitrogen, phosphorus, and sulfate in the wastewater decreased about 10% in the ERM group, and there was a significant correlation between the concentrations of erythromycin, T-N, and T-P in the effluent (p-value < 0.05). Through this, the high concentration of antibiotics can have some effect on the absorption and removal of nutrients by microalgae. Meanwhile, in this study, chlorella sorokiniana-based MPBR achieved a high removal efficiency of over 80% for erythromycin, demonstrating its potential for reducing residual antibiotics. Altogether, the results of this study demonstrated that the microalgae-based continuous MPBR reactor has the potential to simultaneously achieve the removal of residual antibiotics in wastewater, effective wastewater treatment, and biomass recovery. and residual antibiotic control performance.
Today, the use of pharmaceuticals and personal care products (PPCPs) has increased significantly due to an aging population and improved quality of care. In particular, thousands of tons of pharmaceuticals are produced worldwide every year, and they are widely used in agriculture and aquaculture, as well as in the treatment of diseases in humans and animals. After use, these PPCPs flow into wastewater treatment plants through industrial sites, hospital wastewater, and livestock wastewater, and trace pollutants that are not properly treated are eventually discharged into the environment through wastewater. Residual antibiotics can continue to pose a threat to the ecosystem, such as growth inhibition of microorganisms and resistance problems, even at low concentrations. Therefore, controlling residual antibiotics in wastewater is essential to maintaining the health of humans and ecosystems. Also, because wastewater has a high concentration of nitrogen and phosphorus, it can supply excess nutrients to the water system and cause eutrophication. Eutrophication can cause catastrophic social problems such as the destruction of ecosystems and the loss of freshwater resources. In these circumstances, membrane filtration photobioreactor (MPBR) is a potential alternative to treat residual antibiotics by increasing the efficiency of wastewater treatment and maintaining high concentrations of microalgae through a combination of biological treatment with microalgae and physical treatment through membranes. Therefore, this study evaluated the feasibility of simultaneously achieving the removal of residual antibiotics in wastewater, effective wastewater treatment, and biomass recovery using a microalgae-based continuous membrane photobioreactor. For the experiment, erythromycin, a macrolide antibiotic widely used in human and veterinary medicine, was selected as a target antibiotic. In addition, growth inhibition of microalgal biomass and changes in wastewater treatment performance were evaluated in each HRT (hydraulic retention time) in the presence of erythromycin. As a result of the experiment, rapid growth of microalgae was observed in all groups, demonstrating the potential for biomass production in wastewater. But, in the ERM group with erythromycin, a decrease in the dry weight and chlorophyll-a content of microalgae was observed. This growth inhibition is speculated that the environmental stress of microalgae that occurs when erythromycin is present leads to an increase in ROS (reactive oxygen species), which causes the oxidation of intracellular pigments and membrane lipids, and finally photosynthesis and cell growth inhibition. The removal efficiency of total organic carbon (TOC), nitrogen, phosphorus, and sulfate in the wastewater decreased about 10% in the ERM group, and there was a significant correlation between the concentrations of erythromycin, T-N, and T-P in the effluent (p-value < 0.05). Through this, the high concentration of antibiotics can have some effect on the absorption and removal of nutrients by microalgae. Meanwhile, in this study, chlorella sorokiniana-based MPBR achieved a high removal efficiency of over 80% for erythromycin, demonstrating its potential for reducing residual antibiotics. Altogether, the results of this study demonstrated that the microalgae-based continuous MPBR reactor has the potential to simultaneously achieve the removal of residual antibiotics in wastewater, effective wastewater treatment, and biomass recovery. and residual antibiotic control performance.
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#막여과광생물반응조 MPBR 미세조류 항생제 폐수처리 에리스로마이신
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