木质素磺酸钠加强市政污泥好氧发酵重金属钝化

Sodium lignosulfonate enhancing municipal sludge aerobic fermentation for heavy metal passivation

为探究SLS(木质素磺酸钠)对市政污泥好氧发酵重金属(Cr、Zn、Pb、Cu)钝化的影响,分别添加物料总质量0%、5%、10%、15%的SLS(标记为CK、SLS5、SLS10、SLS15)与市政污泥进行好氧发酵,并通过Pearson系数和冗余分析对理化因素与重金属开展相关性分析。重金属分析显示,添加SLS的处理组对重金属钝化效果均优于CK组,其中SLS5组对Cr、Zn、Pb钝化效果最好,钝化率分别为81.46%、32.58%、98.61%,SLS15组对Cu钝化效果最好,钝化率为41.67%。Pearson系数和冗余分析表明,Cr、Zn、Pb、Cu重金属生物有效性均与OM(有机质)呈极显著的正相关(P<0.01),而SLS5组OM的质量分数在各实验组中是最低的。在此研究条件下,添加5%的SLS对市政污泥好氧发酵重金属钝化效果最佳。

To investigate the effect of SLS(sodium lignosulfonate) on heavy metals(Cr,Zn,Pb,Cu) in municipal sludge aerobic fermentation,the municipal sludge and SLS with total material mass of 0%,5%,10%,15%(labeled CK,SLS5,SLS10,SLS15) were added for aerobic fermentation,and correlation analysis between physicochemical factors and heavy metals was carried out through Pearson and redundancy analysis.Heavy metal analysis shows that the SLS group has a better passivation effect on heavy metals than the CK group.The SLS5 group has the best passivation effect on Cr,Zn and Pb with passivation rates of 81.46%,32.58% and 98.61%,respectively.The SLS15 group has the best passivation effect on Cu with a passivation rate of 41.67%.Pearson and redundancy analysis show that the bioavailability of heavy metals such as Cr,Zn,Pb and Cu is positively correlated with OM(organic matter)(P<0.01),and the mass fraction of OM in SLS5 group is the lowest among all groups.Under this condition,adding 5% SLS has the best effect on the passivation of heavy metals in municipal sludge aerobic fermentation.