SYNCHRONOUS REMOVAL OF MOISTURE AND ORGANIC POLLUTANTS IN DREDGING SEDIMENT BY ELECTRO-FENTON
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摘要: 为研究电芬顿对疏浚底泥同步脱水去污的可能,以自产双氧水碳黑改性碳毡(CB-CF)为阴极、Ti/RuO2-IrO2金属氧化物形稳电极(DSA)为阳极构建了电芬顿(EF)反应装置。在此反应装置中,考察了不同Fe2+浓度、初始电流以及初始pH对疏浚底泥含水率、有机质含量的影响。当ρ(Fe2+)为2 mmol/L、初始电流为100 mA、初始pH为7时,反应12 h,底泥中有机质降解率达到53.9%,含水率下降至26%。结果表明:运用自主设计的电芬顿反应装置可在降低疏浚底泥有机污染物的同时达到良好的脱水效果,能够实现对疏浚底泥同步脱水去污。Abstract: To study the possibility of simultaneous dewatering and decontamination of dredged sediment by electro-Fenton, an electro-Fenton experimental (EF) device was constructed with self-produced hydrogen peroxide carbon black modified carbon felt (CB-CF) as the cathode, and dimensionally stable Ti/RuO2-IrO2 electrode anode (DSA) as the anode. In this EF device, the effects of Fe2+ dosage, initial pH value, and initial current density on water content and organic matter content of dredging sediment were conducted. The experiment results showed that under the condition of Fe2+was 2 mmol/L, the initial current was 100 mA, and the initial pH value was 7, the degradation rate of organic matter content reached 53.9%, and the water content of dredging sediment reached 26% after 12 h. This study proved that the electro-Fenton method can achieve a good dehydration effect, as well as reduce organic pollutants contents in dredged sediment, which is a process worth exploring for the reduction and harmless of the dredged sediment.
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Key words:
- dredging sediment /
- electro-Fenton /
- dewatering /
- organic pollutants /
- harmless
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