电絮凝协同活性炭提高污泥脱水性能的可行性探究

Investigation on the Feasibility of Electrocoagulation Synergized with Activated Carbon to Improve Sludge Dewatering Performance

摘要: 本研究通过耦合电絮凝(EC)技术与调理剂即活性炭(AC)或粉煤灰的吸附作用，系统探究其对池塘污泥性能的协同增效机制。实验表明，EC与AC的协同作用显著优于单一技术，污泥含水率平均降低10.0%。通过比较不同投加顺序(正序：先EC后调理剂；反序：先调理剂后EC)及调理剂活性炭或粉煤灰投加量对污泥作用的影响，发现正序调理效果更优，含水率较反序降低7.0%。活性炭因高比表面积和良好孔隙结构，其吸附性能优于粉煤灰，平均含水率进一步降低3.0%。当AC投加量为15%时，正序处理污泥含水率最低(42.13%)，而粉煤灰对应含水率为；46.12%。此时活性炭调理后的滤液浊度(0.40 mg/L)显著低于粉煤灰对应的值(1.86 mg/L)。本研究为污泥脱水工艺提供了基于“吸附–电化学协同”的高效调理方案。

Abstract: This paper systematically explored the synergistic enhancement mechanism of the combined electrocoagulation (EC) technology and the adsorption of conditioners, namely activated carbon (AC) or fly ash, on the performance of pond sludge. Experiments showed that the synergy between EC and AC was significantly superior to single technologies, with the average moisture content of sludge reduced by 10.0%. By comparing the effects of different dosing sequences (positive sequence: EC first followed by conditioner; reverse sequence: conditioner first followed by EC) and the dosage of conditioners (activated carbon or fly ash) on sludge, it was found that the positive sequence conditioning effect was superior, with the moisture content being 7.0% lower than that of the reverse sequence. Due to its high specific surface area and favorable pore structure, AC exhibited better adsorption performance than fly ash, further reducing the average moisture content by 3.0%. When the dosage of AC was 15%, the moisture content of sludge treated in the positive sequence was the lowest, i.e., 42.13%, while the corresponding moisture content of sludge treated with fly ash was 46.12%. In such a situation, the filtrate turbidity of the sludge conditioned by activated carbon (0.40 mg/L) was significantly lower than that of the sludge treated with fly ash (1.86 mg/L).