期刊
WATER
卷 14, 期 2, 页码 -出版社
MDPI
DOI: 10.3390/w14020205
关键词
electrocoagulation; leachate; landfill; treatment optimization; contaminant degradation
资金
- Shiraz University of Medical Sciences [10965]
In this study, electrocoagulation was used to treat landfill leachate and remove COD, NH4+, TDS, TSS, turbidity, and color. The effects of various variables on the treatment efficiency were investigated. Results showed that electrocoagulation with the Fe/Gr electrode had excellent performance in removing COD and NH4+, with favorable indicators.
Electrocoagulation is a widely used method for treating leachate since it is cost effective and eco-friendly. In the present study, the electrocoagulation process was employed to remove chemical oxygen demand (COD), NH4+, total dissolved solids (TDS), total suspended solids (TSS), turbidity, and color from landfill leachate. At first, lime was used as a pretreatment, then the Fe/Gr and Ti/PbO2/steel electrodes were used, and the optimum electrode was selected. Afterwards, the effects of some variables, including pH, current density, temperature, the inter-electrode distance, and the type of electrolyte were investigated. Results showed that COD, NH4+, TSS, TDS, electrical conductivity (EC), turbidity, color, and pH of effluent pretreatment chemical reached 22,371, 385, 884, 21,820 (mg/L), 13.8 (ms/cm(3)), 1355 (NTU), 8500 (TCU) and 10, respectively (the removal efficiency was 0, 20.37, 32.4, 61.99, 59.18, and 56.6 percent). With the Fe/Gr electrode, the optimal condition was observed as follows: pH of 7.5, current density of 64 mA/cm(2), inter-electrode distance was equal to 1.5 cm, temperature at 20 degrees C, and retention time 2-4 h. Overall, the electrocoagulation with the Fe/Gr electrode was a suitable technology for landfill leachate treatment due to its effectiveness for the removal of both COD and NH4+, with advantageous performance indicators.
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