城市污泥与稻草堆肥中邻苯二甲酸酯(PAEs)的研究

PAEs in composts of municipal sludge and rice straw

将广州城市污泥与稻草进行翻堆、接菌 翻堆、连续通气和间歇通气 4种方式的堆肥 ,应用GC/MS技术对堆肥中 6种属于USEPA优控污染物的邻苯二甲酸酯化合物 (PAEs)进行分析 ,探讨堆肥产物中PAEs的含量分布以及不同方式堆肥对PAEs的降解效果 .结果表明 ,4种方式堆肥中PAEs总含量 (∑PAEs )在 9.815～ 17.832mg·kg-1之间 ,依次为翻堆 (17.832mg·kg-1) >接菌 翻堆 (13.92 7mg·kg-1) >间隙通气 (10 .76 5mg·kg-1) >连续通气 (9.815mg·kg-1) .堆肥中PAEs以邻苯二甲酸正二辛酯 (DnOP)为主 ,占∑PAEs的 82 .2 %～ 89.6 % .不同方式堆肥中∑PAEs的降解率为连续通气 (45 .71% ) >间隙通气(40 .4 6 % ) >接菌 翻堆 (2 2 .97% ) >翻堆 (1.37% ) (平均降解率为 2 7.6 3% ) ,其中邻苯二甲酸二乙酯(DEP)、邻苯二甲酸正二丁酯 (DnBP)和邻苯二甲酸丁基苄基酯 (BBP)的降解率分别为 95 .76 %～98.6 8%、79.5 6 %～ 99.4 6 %和 87.4 2 %～ 98.4 2 % ;但邻苯二甲酸二甲酯 (DMP)和邻苯二甲酸正二辛酯的含量反而增加 .邻苯二甲酸 (2 乙基己基 )酯 (DEHP)在所有堆肥中均未检出 .

Four composting treatments for municipal sludge and rice straw were carried out, which included turning composting, inoculation-turning composting, continuous aeration, and intermittent aeration. GC/MS determination of phthalic acid esters (PAEs) in different composted composts showed that the total contents of six PAE compounds (∑PAEs) ranged from 0.980～ 17.832 mg·kg -1 , decreasing in the order of turning composting ( 17.832 mg·kg -1 ) >inoculation-turning composting (13.927 mg·kg -1 ) >intermittent aeration (10.765 mg·kg -1 ) > continuous aeration (9.815 mg·kg -1 ). DnOP was dominated in the composts. The degradation rate of ∑PAEs after composting was 1.37～45.71% (mean 27.63%), and that of diethyl phthalate (DEP), di-n-butyl phthalate (DnBP) and butylbenzyl phthalate (BBP) was 95.76～98.68%, 79.56～99.46% and 87.42～98.42%, respectively. The concentration of di-n-octyl phthalate (DnOP) was increased in the composts. Aeration-composting, and continuous aeration composting in particular, was more efficient than other treatments to degrade PAEs in municipal sludge.