Instituto Tecnológico Superior de Guanajuato, Tecnológico Nacional de México, Carretera Estatal Guanajuato-Puentecillas km. 10.5, 36262, Guanajuato, Guanajuato, Mexico; Departamento de Ingeniería Química, Universidad de Guanajuato, Noria Alta S/N, 36050, Guanajuato, Guanajuato, Mexico.
Departamento de Ingeniería Civil, Universidad de Guanajuato, Av. Juárez 77, Zona Centro, 36000, Guanajuato, Guanajuato, Mexico.
J Environ Manage. 2024 Jan 1;349:119556. doi: 10.1016/j.jenvman.2023.119556. Epub 2023 Nov 20.
In this study, industrial swine slaughterhouse effluents were treated by an electrocoagulation process (EC) with aluminum and iron electrodes. Batch and semicontinuous operation were performed. EC tests were carried out in batch operating mode for 2.5 h using fixed current densities (j = 10, 20, and 30 mA cm) in sulfate and chloride media. At the laboratory scale, higher TOC removal efficiencies were observed using aluminum electrodes at 20 mA cm without the addition of a supporting electrolyte (82.7%). However, the EC process with Fe electrodes consumed 43.6% less energy. After the best operating parameters were found at the laboratory scale, the process was tested as a semicontinuous prepilot process using a filter-press FM01-LC-type electrochemical reactor equipped with flat plate aluminum electrodes. In this stage, current densities and mean linear flow rates were assessed. The highest TOC removal efficiency of 72.7% (i.e., residual TOC concentration of 85.18 mg L) in the semicontinuous process was achieved by the application of j = 25 mA cm and u = 0.64 cm s with an energy consumption of 19.80 kW h m. The residual COD and TP concentrations met the international standard limits. Moreover, complete decoloration and disinfection were accomplished. EDXRF, SEM, EDAX, XRD, and FTIR analyses indicated that pollutants were removed by adsorption on aluminum/iron hydroxides/oxyhydroxides.
本研究采用电化学混凝法（EC）处理工业猪场屠宰废水，分别使用铝电极和铁电极。采用间歇式和半连续式操作。在间歇操作模式下进行了 2.5 h 的 EC 测试，使用固定电流密度（j = 10、20 和 30 mA cm）在硫酸盐和氯化物介质中进行实验。在实验室规模下，使用铝电极在 20 mA cm 时，无需添加支持电解质，可观察到较高的 TOC 去除效率（82.7%）。然而，使用 Fe 电极的 EC 过程消耗的能量减少了 43.6%。在实验室规模下找到最佳操作参数后，使用配备平板铝电极的 FM01-LC 型过滤压力式电化学反应器作为半连续中试工艺进行了测试。在该阶段，评估了电流密度和平均线性流速。在半连续工艺中，应用 j = 25 mA cm 和 u = 0.64 cm s，电流密度和平均线性流速分别为 25 mA cm 和 0.64 cm s，可实现 72.7%的 TOC 去除效率（即残留 TOC 浓度为 85.18 mg L），能耗为 19.80 kW h m。残留的 COD 和 TP 浓度符合国际标准限制。此外，还实现了完全脱色和消毒。EDXRF、SEM、EDAX、XRD 和 FTIR 分析表明，污染物通过吸附在铝/铁氢氧化物/水氧化物上去除。
