城市污泥与玉米秸秆堆肥中多环芳烃(PAHs)的研究

Study on PAHs in Composts of Municipal Sludge and Maize Straw

摘要: 将城市污泥与玉米秸秆进行自然通风堆肥处理，应用GC/MS检测方法对污泥堆肥中的多环芳烃化合物(PAHs)进行了分析。污泥堆肥中PAHs的含量较低，ΣPAHs和ΣPAHs_carc分别为0.561 mg/kg和0.107 mg/kg，绝大部分PAHs化合物的含量低于0.050 mg/kg，含量较高的主要是中、低分子量的化合物。PAHs的降解效果显著，ΣPAHs和ΣPAHs_carc的降解率在80%左右，绝大部分化合物的降解率在50%以上，中等分子量的3个和4个苯环的化合物的降解效果相对较好。污泥堆肥中PAHs的含量、分布模式及其降解效果与原污泥中PAHs的特征密切相关。

Abstract: Co-composting of municipal sludge and maize straw by natural aeration was carried out and polynuclear aromatic hydrocarbons (PAHs) in compost were determined by GC/MS. The content of PAHs in compost was low, ΣPAHs and ΣPAHs_carc are 0.561 mg/kg and 0.107 mg/kg respectively and most of compounds are lower than 0.050 mg/kg. Predominant compounds were those with low-medium molecular weights. Significant degradation rate of PAHs in compost was found, ΣPAHs and ΣPAHs_carc are 80% or so and most of compounds are more than 50%. Greater degradation was observed for those compounds with medium molecular weights and 3-,4-benzene rings. Concentration, distribution pattern, and degradation rate of PAHs in compost depended to a great extent on the PAHs features in noncomposting municipal sludge.