城市污泥与稻草堆肥中多环芳烃的研究

A STUDY ON PAHs IN COMPOSTS OF MUNICIPAL SLUDGE AND RICE STRAW

将污泥与稻草进行翻堆、菌种 翻堆、连续通气和间歇通气 4种不同方式的堆肥 ,应用GC/MS对堆肥中的多环芳烃类化合物 (PAHs)进行分析 ,探讨堆肥产物中PAHs的含量分布模式以及不同堆肥方式对PAHs的降解效果 . 4种污泥堆肥中ΣPAHs在2 0 83—2 8 4 35mg·kg- 1之间 ,依次是菌种 翻堆 ( 2 8 4 35mg·kg- 1>翻堆 ( 7 30 3mg·kg- 1) >连续通气 ( 4 80 8mg·kg- 1) >间隙通气 ( 2 0 83mg·kg- 1) ,绝大部分化合物的含量都低于 0 2 0mg·kg- 1.堆肥前后ΣPAHs降解率在 6 5 5 %— 93 2 0 %之间 (平均为6 5 0 0 % ) ,绝大部分化合物的降解率都在 90 %以上 .通气堆肥尤其是间歇通气堆肥对污泥中PAHs的降解效果最好 .

Four composting treatments including manual turning,inoculating-manual turning,continuous aeration,and intermittent aeration for municipal sludge and rice straw were carried out.Polycyclic aromatic hydrocarbons(PAHs)in different composts were determined by GC/MS.Total contents of 17 PAHs compounds(ΣPAHs)in composts ranged from 2.083mg·kg -1 to 28.435mg·kg -1,which decreased in the order:inoculating-manual turning(28.435mg·kg -1)>manual turning(7.303 mg·kg -1)>continuous aeration(4.808 mg·kg -1)>intermittent aeration(2.083 mg·kg -1).Aeration-composting especially intermittent aeration composting was more efficient to degrade PAHs in muni- cipal sludge than other treatments,with degradation rates of more than 90%for ΣPAHs and most individual PAHs compounds.The content of most individual PAHs compounds in intermittent aeration compost was lower than 0.20mg·kg -1.Suitable composting with rice straw is practical to reduce PAHs in municipal sludge by indigenous microbial strains.