摘要
针对梁溪河底泥的性状特点,对疏浚泥浆在线脱水工艺进行了设计和试验。通过泥浆沉降柱试验和药剂上机选型试验,对比了上清液浊度与沉降柱体积、饼含固率和卸料时间,分析确定了药剂选型及投加量;通过滤布透气量选型试验对比了各透气量下的泥饼含固率和滤布穿滤时间,确定了滤布的透气量;最后利用上述试验所得数据进行板框机的现场调试运行,确定了最佳进料和反压时间下对应的末期排水量特征值并以此作为停泵参考指导施工。工程实践表明,疏浚泥浆在线脱水工艺可达到泥浆减量率不小于50%、泥饼含固率不小于60%、泥饼厚度不小于25 mm的设计要求,工艺具备可行性。
Based on the characteristics of the bottom mud of the Liangxi River,the technology of online dewatering for dredged mud was designed and tested.Through settling column tests and type selection tests for chemicals by computer operation,the turbidity of the supernatant and the volume of the settling column,and the solid content of mud cakes and the discharging time were compared respectively.The chemical selection and dosage were thus analyzed and determined.Through type selection tests for the air permeability of the filter cloth,the solid content of mud cakes and the permeability time under different air permeability were compared.Accordingly,the air permeability of filter cloth was determined.Finally,by applying the data from the above tests on on-site operation of the plate and frame machine,the eigenvalue of the final displacement corresponding to the optimal feeding and back pressure time was determined and used as a reference for pump termination.According to the results of engineering practice,the online dewatering process for dredged mud can meet the design requirements of mud loss rate not less than 50%,mud cake solid content not less than 60%,and mud cake thickness not less than 25 mm,indicating feasibility of the technics.
作者
高扬
杨栋
倪守高
罗荣彪
王晓英
GAO Yang;YANG Dong;NI Shougao;LUO Rongbiao;WANG Xiaoying(Jiangsu Dongfang Ecological Dredging Engineering Co.,Ltd.,Wuxi 214125,China;China Ship Scientific Research Center,Wuxi 214083,China;Wuxi Binhu District Water Conservancy Bureau,Wuxi 214123,China)
出处
《水利水电科技进展》
CSCD
北大核心
2021年第3期77-82,共6页
Advances in Science and Technology of Water Resources
基金
水体污染控制与治理科技重大专项(2017ZX07203)。
关键词
疏浚泥浆
泥浆脱水
机械脱水
环保疏浚
板框压滤机
dredged mud
mud dehydration
mechanical dehydration
environmental dredging
plate-and-frame filter press
