Carbon-neutral potential in treatment of amide-containing industrial wastewater by anaerobic membrane bioreactor(AnMBR):Energy recovery and carbon emission reduction
With the growing concern about the concept of carbon neutrality in the treatment of industrial wastewater,anaerobic membrane bioreactor(AnMBR),known for its advantages of energy conservation,carbon reduction and resource utilization,is considered as a good alternative for the treatment of amide industrial wastewater.In this study,a long-term continuous experiment was conducted using an AnMBR system to treat industrial wastewater with a high concentration of dimethylformamide(DMF),complemented by theoretical calculations.The practical application potential of the AnMBR system was evaluated by comparing its energy consumption,carbon dioxide emissions,and economic performance with that of a conventional activated sludge(CAS)process of the same scale.The experimental results demonstrated that under a chemical oxygen demand(COD)of 9 657 mg·L-1,the net energy income of the AnMBR system reached 9.72 kWh·m-3,fully achieving energy self-sufficiency.Additionally,the net carbon dioxide emission was negative(-2.34 kg·m-3),indicating that the AnMBR system had the potential for negative carbon emissions.In contrast,the traditional activated sludge process(CAS)consistently showed positive carbon emissions and fails to achieve energy recovery when treating the same wastewater.The economic analysis indicated that the AnMBR process could significantly reduce treatment costs while generating substantial economic benefits through methane power generation and the sale of high-purity biogas.In summary,AnMBR,as an emerging carbon-neutral technology,demonstratesd outstanding advantages in energy savings and emission reduction for treating high-concentration industrial organic wastewater.It holds the potential to replace the CAS process,thereby contributing to the green and low-carbon transformation of industrial wastewater treatment technology.
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