木质膨松剂对猪粪堆肥中腐殖质形成的重金属络合作用的影响。
Influence of Ligneous Bulking Agents on the Complexation of Heavy Metals to Humic Substances Formed in Pig Manure Composting.
机构信息
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing, 100875, China.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China.
出版信息
Bull Environ Contam Toxicol. 2019 Aug;103(2):323-329. doi: 10.1007/s00128-019-02659-1. Epub 2019 Jun 22.
In order to investigate the influence of different lignin sources on humic substance formation during composting, this study selected two lignin sources, including wood sawdust and maize straw, to be co-composted with pig manure. Humic substances (HS) were characterized based on their fluorescence characteristics and complexing behaviors with heavy metals. The results showed that lignin sources, especially wood sawdust, were more conducive in promoting the formation of humic acids (HAs) than inorganic matter. The fluorescence excitation-emission matrix spectra also proved the positive effects of lignin on the formation of HAs during the humification process. The binding capacities of HAs isolated from mature composts for Cu and Cd followed the order of WS-90 > MS-90 > I-90, indicating that organic bulking agents are superior at increasing the complexing capacity of HAs. This finding suggests that the co-composting of pig manure with ligneous bulking agents is more advantageous at reducing the environmental risk of heavy metals.
为了研究不同木质素源在堆肥过程中对腐殖质形成的影响，本研究选择了两种木质素源，即木屑和玉米秸秆，与猪粪进行共堆肥。根据腐殖质的荧光特性和与重金属的络合行为对腐殖质（HS）进行了表征。结果表明，木质素源，特别是木屑，比无机物更有利于腐殖酸（HAs）的形成。荧光激发-发射矩阵光谱也证明了木质素在腐殖化过程中对 HAs 形成的积极影响。从成熟堆肥中分离出的 HAs 对 Cu 和 Cd 的结合能力顺序为 WS-90>MS-90>I-90，表明有机膨胀剂更能提高 HAs 的络合能力。这一发现表明，猪粪与木质素膨胀剂共堆肥更有利于降低重金属的环境风险。
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