Fontmorin J-M, Sillanpää Mika
a Laboratory of Green Chemistry, School of Engineering Science , Lappeenranta University of Technology , Mikkeli , Finland.
Environ Technol. 2017 Feb;38(4):495-505. doi: 10.1080/09593330.2016.1199598. Epub 2016 Jun 24.
In this study, the relevance of Fenton's reaction for the treatment of urban anaerobically digested sludge was investigated. In a first part, the impact of the oxidation process on the improvement of the sludge dewaterability was studied. In a second part, the removal of heavy metals from the sludge was examined. Fenton's reaction was carried out with increasing concentrations of Fe and HO in 1:10 and 1:1 ratios. Dewaterability of the raw sludge was highly improved: the addition of 36 mM Fe and 360 mM HO led to specific cake resistance (SCR) and capillary suction time (CST) reductions of 99.8% and 98.8%, respectively. Indeed, under these conditions, SCR and CST of respectively 1.04 × 10 m kg and 18.5 ± 0.2 s were measured, and the treated sludge could be considered as having 'good dewaterability'. A significant impact was also observed on the removal of heavy metals from the sludge. After 1-h oxidation, Cd, Cr, Cu, Pb and Zn could be removed by 81.1 ± 0.1%, 25.1 ± 0.1%, 87.2 ± 1.1%, 77.3 ± 4.8% and 99.6 ± 0.3%, respectively. These results were consistent with the heavy metals' fractions in the sludge. It could be concluded that the addition of Fe and HO in a 1:10 ratio was more effective than in a 1:1 ratio. The results were consistent with the extracellular polymeric substance (EPS) contents in raw and treated sludge, since loosely bound EPS decreased significantly after the treatment.
在本研究中，考察了芬顿反应对城市厌氧消化污泥处理的相关性。第一部分，研究了氧化过程对污泥脱水性能改善的影响。第二部分，考察了污泥中重金属的去除情况。以1:10和1:1的比例增加铁和过氧化氢的浓度进行芬顿反应。原污泥的脱水性能得到显著改善：添加36 mM铁和360 mM过氧化氢分别使比阻（SCR）和毛细吸水时间（CST）降低了99.8%和98.8%。事实上，在这些条件下，测得的SCR和CST分别为1.04×10 m/kg和18.5±0.2 s，处理后的污泥可被认为具有“良好的脱水性能”。还观察到对污泥中重金属去除的显著影响。氧化1小时后，镉、铬、铜、铅和锌的去除率分别为81.1±0.1%、25.1±0.1%、87.2±1.1%、77.3±4.8%和99.6±0.3%。这些结果与污泥中重金属的形态一致。可以得出结论，以1:10的比例添加铁和过氧化氢比1:1的比例更有效。结果与原污泥和处理后污泥中胞外聚合物（EPS）的含量一致，因为处理后松散结合的EPS显著减少。
