生物质炭对城市污泥堆肥过程中碳素转化的影响

为促进城市污泥土地化利用,将生物质炭与城市污泥分别以0、3%、5%、10%的比例添加在城市污泥的好氧静态堆肥试验中,研究不同配比下堆肥反应过程中含水率、总有机碳、腐殖质酸、胡敏酸、富里酸含量的动态变化。结果表明:与对照相比,添加生物质炭可有效增加堆肥产品中水分含量,促进堆肥进程。各处理在堆肥末期含水率、总有机碳含量均呈下降趋势,但处理2(生物质炭添加量为5%,稻壳/城市污泥(4∶1)添加量为95%)的含水率较对照高5.8百分点,总有机碳含量较对照高40g·kg~(-1);各处理在堆肥结束期其腐殖质炭含量及胡敏酸炭含量明显增多,增加量由大至小依次为处理2处理3处理1对照。综合各项指标,与其它处理相比,处理2即当生物质炭添加量为5%时,更能促进整个堆肥过程中微生物的活性,更能保证堆肥产品质量。

Effect of Biomass Carbon on Carbon Transformation During Composting of Urban Sewage Sludge

In order to promote the city land utilization of sludge,the biomass carbon and city sludge were added as the proportion of 0,3%,5% and 10% in city sludge aerobic static composting,composting process of dynamic change under different ratio of moisture content,total organic carbon,humic acid,humic acid,fulvic acid content were studied.The results showed that compared with the control,the addition of biochar could effectively increase the moisture content of compost products and promote the composting process.At the end of each treatment in the compost water content,total organic carbon content decreased,but the water content of treatment 2(5% biomass carbon content,95% rice husk / city sludge(4∶1))increased 5.8 percentage points,the total organic carbon content was higher than the control 40 g·kg-1in each treatment;the end of the period of composting humus carbon content and carbon content of HA increased significantly,the increasing amount from big to small was in turn treatment 2>treatment 3>treatment 1>control.Combined with other indicators and compared with other treatments,when the biomass carbon content was 5%,the microbial activity was promoted in the whole composting process,which can ensure the quality of compost products.