印染污泥性质对多环芳烃分布及经US-Fenton处理后降解的影响

INFLUENCE OF PROPERTIES OF TEXTILE DYEING SLUDGE ON DISTRIBUTION AND DEGRADATION OF PAHs AFTER THE TREATMENT OF US-Fenton

通过研究4家印染废水处理厂中污泥的物化性质,包括金属元素、非金属元素、有机质和16种多环芳烃含量(Σ_(16)PAHs),进一步探讨了经超声-芬顿(US-Fenton)处理后印染污泥中PAHs降解率与印染污泥物化性质的相关性。结果表明:4种印染污泥中Σ_(16)PAHs浓度为983.52-2942.34 ng/g,其中低分子量PAHs浓度为570.47-1919.97 ng/g,占比超过50%,是Σ_(16)PAHs的主要成分。经US-Fenton处理后,Σ_(16)PAHs降解率为35.24%-61.80%,低分子量PAHs降解率比高分子量PAHs降解率高,分别为28.22%-40.48%和11.76%-24.04%。印染污泥的物化性质对PAHs降解率具有显著影响,其中碳元素、铁元素和有机质分别与PAHs降解率呈负相关,而钙元素与PAHs降解率呈正相关。研究结果可为US-Fenton降解印染污泥中PAHs的机理研究提供理论依据。

The physicochemical properties of four kinds of textile dyeing sludge were investigated, including the levels of metal, nonmetal, organic matter and 16 polycyclic aromatic hydrocarbons(Σ_(16)PAHs). Furthermore, the relationship between the degradation efficiency of PAHs after the treatment of ultrasonic Fenton technology(US-Fenton) and the physicochemical properties of the sludge were discussed. The results showed that the concentration of Σ_(16)PAHs in sludge was 983.52~2942.34 ng/g, and that of the low molecular weight PAHs was 570.47~1919.97 ng/g, which was the main component of Σ_(16)PAHs, accounting for more than 50% by mass weight. After the US-Fenton treatment, the degradation rate of Σ_(16)PAHs was 35.24%~61.80% and the degradation rate of lower molecular weight PAHs was higher than that of the higher molecular weight PAHs, about 28.22%~40.48% and 11.76%~24.04%, respectively. The results indicated that the characteristics of the sludge had a great impact on the degradation of PAHs, among which, C, Fe and organic matter content had a negative correlation with the degradation of PAHs, respectively. Ca content in sludge had a positive correlation with the degradation rate of PAHs. And their correlation coefficient R^(2) were all more than 0.90. This study would provide a theoretical basis for the degradation of PAHs and other organic pollutants in sludge by US-Fenton.