农村固体废弃物堆肥胡敏酸还原土壤Fe^(3+)矿物研究  

Structure Evolution of Compost-derived HAs from Rural Solid Waste and Corresponding Reduction of Fe^(3+) Mineral from Soil

作　　者：付强[1] 袁野[1,2] 崔嵩[1] 

机构地区：[1]东北农业大学水利与建筑学院,哈尔滨150030 [2]黑龙江省水利水电勘测设计研究院,哈尔滨150080

出　　处：《农业机械学报》2016年第10期202-208,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51279031;41401550)

摘　　要：堆肥胡敏酸作为农村固体废弃物资源化处置的重要产物,除具有保水保肥的功能外,还具有氧化还原特性。针对农村固体废弃物堆肥胡敏酸结构特性,进行了堆肥全过程胡敏酸结构演变对土壤Fe^(3+)矿物还原特性研究。结果表明,随堆肥进行,堆肥胡敏酸芳香化、腐殖化加剧,氧化还原功能基团、组分含量增加,可有效促进土壤Fe^(3+)矿物还原。醌基团是堆肥胡敏酸重要的氧化还原功能基团,堆肥中后期木质纤维素降解释放醌基团,经缩合作用与堆肥胡敏酸结合加速堆肥腐殖化进程,增强堆肥胡敏酸氧化还原性能,提升Fe^(3+)矿物还原能力。Low efficiency of resource utilization of rural solid wastes resulted in more and more serious environmental pollution in rural areas. As a significant resource approach of rural solid wastes, compost has been widely used. Compost-derived HAs as the important products of solid waste compost were confirmed to be redox recently. Whether compost-derived HAs were similar to natural HAs to be able to promote the reduction of Fe3＋ mineral was unclear. The rural solid wastes compost continued 40 d in an indoor eomposting reactor. Physical and chemical indexes changes during composting confirmed the successful rural solid waste compost. Spectra results of compost-derived HAs indicated that the aromatieity, humification and content of redox functional groups of compost-derived HAs were all increased during composting, which would facilitate the reduction of Fe3~ minerals. Specific U~ absorbance values of compost-derived HAs demonstrated that quinones were the main redox functional groups within compost-derived HAs, which were mainly derived from the degradation of lignocellulose in compost materials in middle- and later-stage compost. Then these quinones would combine with the compost-derived HAs which would accelerate the humification of compost-derived HAs, increase their redox properties and the reduction of Fe3＋ minerals and facilitate the degradation of organic contaminants in soil.

关 键 词：农村固体废弃物 好氧堆肥 胡敏酸 Fe3+矿物还原 

分 类 号：X712[环境科学与工程—环境工程]