秸秆排水体联合真空预压处理对疏浚淤泥有机质和养分影响研究  

Research on the Organic Matter and Nutrients of Dredged Mud after Being Treated by Vacuum Preloading Combined with the Straw Drainage Body

作　　者：王山 徐桂中[2] 罗凤华 陈先勇 李伸鑫 WANG Shan;XU Gui-zhong;LUO Feng-hua;CHEN Xian-yong;LI Shen-xin(Jiangsu Yuheng Engineering Quality Inspection Co.,Ltd.,Yancheng 224000,Jiangsu Province,China;Yancheng Institute of Technology,Yancheng 224000,Jiangsu Province,China;Anhui University of Science and Technology,Huainan 232000,Anhui Province,China)

机构地区：[1]江苏禹衡工程质量检测有限公司,江苏盐城224000 [2]盐城工学院,江苏盐城224000 [3]安徽理工大学,安徽淮南232000

出　　处：《中国农村水利水电》2023年第4期33-39,共7页China Rural Water and Hydropower

基　　金：江苏水利科技项目(2020018);江苏省产学研合作项目(BY2021499)。

摘　　要：采用秸秆排水体联合真空预压法处理疏浚泥时,秸秆排水体将不可避免地发生降解,从而改变真空预压处理后疏浚淤泥的耕植性能。为了明确真空预压过程中秸秆排水体的降解对疏浚淤泥耕植性能的影响规律,开展以秸秆排水体为竖向排水体的疏浚淤泥真空预压大尺寸模型试验,通过测定真空预压处理后疏浚淤泥内不同位置的有机质和营养元素含量的分布情况,探讨了秸秆排水体降解对疏浚泥可耕植性的影响,为秸秆排水体用于生态处理疏浚淤泥技术提供技术支撑。研究结果表明:和未处理的疏浚泥相比,秸秆降解会引起处理后疏浚泥有机质、碳C、氮)、磷P和钾K等含量的增加,同时会引起碳氮比C/N的降低。相同深度处,疏浚泥中有机质含量随距排水体距离的增加而减小。而距排水体相同距离处,疏浚泥中有机质含量随深度增加的变化量较小,基本都小于1.0%。另外,疏浚淤泥中碳C、氮N、磷P和钾K含量随深度和距排水体距离增加表现出不同的变化趋势。但当距排水体的距离达到30 cm后,疏浚淤泥中营养元素含量均趋于稳定。As the dredged slurry is treated by straw drainage combined with vacuum preloading,the straw drainage will inevitably degrade,thus changing the cultivation performance of the dredged slurry after vacuum preloading.To clarify the influence law of the degradation of straw as a drainage body on the cultivation performance of dredged slurry during vacuum preloading,a large-scale model test of vacuum pre⁃loading of dredged slurry with straw as the vertical drainage body is carried out.By measuring the distribution of organic matter and nutrient elements in different positions of dredged slurry after vacuum preloading,the influence of straw drainage body degradation on the cultivability of the dredged slurry is discussed,which can provide technical support for straw drainage used in the ecological treatment of dredged slur⁃ry.The results show that compared with untreated dredged slurry,straw degradation would increase the contents of organic matter,carbon(C),nitrogen(N),phosphorus(P),and potassium(K)in the treated slurry,and reduce the carbon nitrogen ratio(C/N).At the same depth,the organic matter content in the dredged slurry decreases with the increase in the distance from the drainage body.At the same dis⁃tance from the drainage body,the variation of organic matter content in the dredged slurry with the increase in depth is small,which is less than 1.0%.Additionally,the contents of carbon(C),nitrogen(N),phosphorus(P),and potassium(K)in dredged slurry show different trends with the increase in depth and distance from the drainage body.However,when the distance from the drainage body reaches 30 cm,the content of nutrient elements in the dredged slurry tends to be stable.

关 键 词：疏浚淤泥 秸秆排水体 秸秆降解 有机质 养分 

分 类 号：TV85[水利工程—水利水电工程] S15[农业科学—土壤学]