源分类家庭有机垃圾及其堆肥产品中的PAHs

将源分类家庭生物有机垃圾同秸秆按质量比10:1混合后进行堆肥处理,应用气相色谱-质谱联用仪(GC-MS)按照U.S.EPA 8270方法对生物有机垃圾及其堆肥产品中16种PAHs进行分析测试,比较生物有机垃圾及其堆肥产品中16种PAHs含量、分布及生物降解率,评估堆肥产品PAHs农田风险,综合论述影响家庭有机垃圾堆肥过程中PAHs降解因素,为生物有机垃圾堆肥农田利用提供依据.结果表明,源分类家庭生物有机垃圾及其堆肥产品中∑PAH16化合物含量分别为2.19和1.96mg/ks(以干重计,下同),其中萘、芴、菲、荧蒽含量相对较高,占总量的79.76%和81.76%,这4种有机物的苯环在2-3之间,属于易降解非致癌物质,在农田施用中易被降解;在生物垃圾堆肥过程中∑PAH16的生物降解率为25.88%,堆肥后产品PAHs含量符合农田使用标准.

PAHs of source separation household organic waste and composting production

Composing treatments of source separation (SS) household bio-organic waste and straw mixed in 10:1, 16 kinds of PAHs in source separation household bio-organic waste and compost production were determined by gas chromatograph/mass spectrograph (GC-MS) according to U.S.EPA 8270 standard method. Comparing 16 kinds of PAHs content, distributing and biodegradability,we evaluated the PAHs risk in farmland and discoursed the impact factors of PAHs biodegradability in household bio-organic waste composting. The results show that SigmaPAH16 contents in source separation household bio-organic waste and composting production is 2.19 and 1.96 mg/kg DM, and the contents of naphthalene, fluorene, phenanthrene, fluoranthene are relatively higher than others. The percent of these four organic pollutions is 79.76% and 81.76% in PAH16, respectively. The benzene loop number of these four organic pollutions is 2-3, and it' s easily degradable non-carcinogen in farmland utilization. SigmaPAH16 biodegradability is 25.88%, and the content of PAHs in SS household bio-organic waste compost production fits the farmland utilization criteria.