含生物质炭城市污泥堆肥中溶解性有机质的光谱特征

Spectral characteristics of dissolved organic matter in co-composting process of municipal sludge with biochar

以外源添加生物质炭的城市污泥堆肥过程中溶解性有机质(DOM)为研究对象,讨论了其紫外-可见和荧光光谱特征变化.结果表明:与对照组相比,外源添加生物质炭的处理其堆肥DOM的芳香性和腐殖化程度更高,有利于提高堆肥的腐熟度,且外源添加花生壳炭的处理较添加小麦秸秆炭的处理更有利于堆肥腐熟度的提高.外源添加花生壳炭的处理在堆肥21d后,其堆肥腐熟度可能达到峰值,而外源添加小麦秸秆炭的处理其堆肥腐熟度则随着堆肥时间的进行而增加.对照组和处理组堆肥DOM的FI>0.7,BIX>0.8,表明其来源为自生源,可能与微生物对有机物的降解有关.因此,通过对城市污泥堆肥过程中DOM的光谱特征分析,能较好地评估城市污泥堆肥腐熟度的情况.

Changes in the UV-visible and fluorescence characteristics of DOM from the co-composting process of municipal sludge with two types of biochars were discussed. The results showed the aromaticity and humification of DOM from the co-composting with biochars significantly increased compared with control, which indicated in favor of improving the maturity of compost. The treatment with biochar from peanut shell showed the highest maturity, followed by wheat straw biochar. After 21days, compost treated with biochar from peanut shell reached its maximum maturity, while that treated with biochar from wheat straw continued to increase over the whole time. Meanwhile, the DOM from the compost with or without treatment was found to be autochthonous, FI〉0.7, BIX〉0.8, mainly attributed to the microbial decomposition of compost. Thus, the spectral characteristics of DOM are capable of assessing the degree of maturity of compost during the co-composting process with biochars from different source.