微生物电化学辅助厌氧折流板反应器强化废水处理效能试验研究.docx

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Abstract
Electrochemically assisted anaerobic baffled reactor (ABR) technology has been widely investigated as an effective means to enhance wastewater treatment. In this study, a series of experiments was conducted to evaluate the effectiveness of the electrochemically assisted ABR system in treating wastewater. The electrochemically assisted ABR system has significant potential for the efficient removal of pollutants from wastewater, with high removal rates of chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP).
Introduction
The discharge of wastewater into the environment has been continuously increasing, resulting in environmental pollution. As a result, many conventional methods, such as suspended growth systems, have been widely used to treat wastewater. However, these systems have several limitations, such as the low removal efficiency, the requirement for high energy consumption, and a significant amount of sludge generation. To overcome these drawbacks, electrochemically assisted biological systems have been developed. These systems include an anode electrode, which is used to stimulate bacterial activity and enhance the efficiency of wastewater treatment.
Materials and Methods
A laboratory-scale electrochemically assisted ABR system was used for this study. The reactor was made of Plexiglas material, and its working volume was 20 L. The reactor had five compartments, and each compartment had a volume of 4 L. The anode was made of graphite, and its surface area was m2. The reactor was operated for 180 days at an average temperature of 25 ℃, with hydraulic retention times (HRTs) of 12 h.
Results
The electrochemically assisted ABR system was able to remove COD, TN, and TP at average removal rates of %, %, and %, respectively. The system also demonstrated a high stability during the operation with an average pH range of -, and the alkalinity concentration was maintained at the level of 1000 mg/L. The electrochemical system enhanced the performance of the anaerobic bacteria, and the production of biogas was increased by % compared with the ABR system without electrochemical assistance.
Discussion
The enhancement of biodegradation by electrochemical assistance is due to several mechanisms. The presence of an anode electrode increases bacterial activity, allowing the bacteria to consume organic pollutants more efficiently. Moreover, an electric field is formed between the anode and the cathode, which increases the transport of electrons to the bacteria. This increase leads to the formation of a biofilm on the surface of the anode electrode, which further enhances the electrochemical activity of the bacteria.
Conclusion
The electrochemically assisted ABR system showed significant potential for the efficient removal of pollutants from wastewater, with high removal rates of COD, TN, and TP. The electrochemical assistance enhances the performance of anaerobic bacteria and significantly increases the production of biogas. Thus, the electrochemically assisted ABR system is a promising technology for the treatment of wastewater.