Analysis of Organic Properties of Coffee Processing Wastewater Based on Three-Dimensional Electro-Fenton Method
The study established a three-dimensional electro-Fenton system for coffee processing wastewater,aimed at the issues of high concentration of organic matter,difficult degradation and poor biochemistry.The sys-tem utilized titanium-based ruthenium-iridium electrode as the anode plate,nickel foam as the cathode plate,and iron-carbon particles as the particle electrodes.Through single-factor experiments,it was found that under the conditions of plate spacing of 4 cm,initial pH of 4.0,current density of 32 mA/cm2,particle electrode dosage of 20 g/L,aeration intensity of 4 L/min,and reaction time of 90 min,the COD removal rate of coffee processing wastewater can reach to 69.29%,UV254 removal rate can reach to72.92%,color removal rate can reach to 96.69%,and B/C ratio was improved from 0.28 to 0.43.Comparing the effects of iron-carbon microelectrolys-is,traditional electro-Fenton and three-dimensional electro-Fenton on removing COD from coffee processing wastewater,it was observed that the three-dimensional electro-Fenton system significantly improved material transfer rate and mass transfer effect.The varieties of organic pollutants were reduced from 90 to 39,and refracto-ry humic acid macromolecular organic compounds were almost completely removed,mainly degraded into small molecular organic compounds,greatly improving biodegradability.
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