不同用量竹炭对污泥堆肥过程温室气体排放的影响

发布时间：2018-02-26 16:29

本文关键词： 城市污泥堆肥处理竹炭温室气体排放特征　出处：《环境科学》2017年10期 　论文类型：期刊论文

【摘要】：采用城市污泥为堆肥基质,设置4个堆肥处理,分别为添加2.5%竹炭(S1,占污泥的质量分数)、添加5%竹炭(S2)、添加10%竹炭(S3)和未添加竹碳(CK),研究城市污泥堆肥过程中温室气体的动态变化特征及添加不同用量竹炭的影响.结果表明,CH_4排放主要在升温期和高温前期,占排放总量的99.01%~99.81%.当竹炭添加量低于5%时,CH_4排放量随添加量的增加而减少;竹炭添加量高于5%时,其排放量又明显增加.CO_2排放集中在升温期和高温期,占排放总量的75.65%~86.58%;添加竹炭可减少3.37%~13.48%的CO_2排放,但处理间不存在显著差异(P0.05).N_2O排放集中在升温期和降温腐熟期,添加竹炭能减少16.37%~41.52%的N_2O排放,竹炭添加量越多,减排效果越好(P0.05).S1、S2和S3处理CO_2排放当量(以干污泥计)分别为37.57、35.10和35.44 kg·t~(-1),比CK处理减少了14.81%~20.41%.添加竹炭能降低污泥堆肥温室气体排放,其中,以S2处理的减排效果较为显著.
[Abstract]:Using municipal sludge as composting substrate, four composting treatments were set up. The dynamic characteristics of greenhouse gas and the shadow of bamboo charcoal were studied in the process of sludge composting by adding 2.5% bamboo charcoal (S1), adding 5% bamboo charcoal (S2N), adding 10% bamboo charcoal (S3) and adding bamboo carbon (S3), respectively, to study the dynamic changes of greenhouse gases in the process of municipal sludge composting. The results show that CH4 emissions mainly occur during the heating period and the early stage of high temperature. When the amount of bamboo charcoal added is lower than 5, the amount of CH4 emission decreases with the increase of the amount of added bamboo charcoal, and when the amount of bamboo charcoal added is higher than 5, the emission of .CO2 increases significantly, and the emission of Ch _ 4 is concentrated in the heating period and the high temperature period. The addition of bamboo charcoal can reduce the CO_2 emission by 3.37% or 13.48%, but there is no significant difference between the treatments. The emission of P0.05N _ 2O is concentrated in the heating period and the cooling stage. Adding bamboo charcoal can reduce the N _ 2O emission by 16.37% 41.52%, and the more the bamboo charcoal is added, The better the emission reduction effect was, the better the CO_2 emission equivalent (measured by dry sludge) of P0.05 / S1FS2 and S3 treatments was 37.57 kg / kg / kg / t ~ (-1) and 35.44 kg 路t ~ (-1) ~ (-1) respectively, which decreased the greenhouse gas emissions of sludge compost by adding bamboo charcoal, and the emission reduction effect of S _ (2) treatment was more remarkable than that of CK treatment.
【作者单位】：西南大学资源环境学院;重庆市农业资源与环境研究重点实验室;西南大学地理科学学院;
【基金】：国家自然科学基金项目(51208426) 西南大学资源环境学院“光炯”培育项目(20130103)
【分类号】：S141.4;X70

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