群桩基础、地下连续墙等施工会带来巨量的废弃泥浆,城市地下空间开发利用及盾构掘进过程会产生大量高含水率泥浆状的渣土,常规的堆场处理受限于成本和环境问题,需要对废弃泥浆进行高效脱水处理,减少废弃泥浆量。为研究絮凝剂调理废弃泥浆的脱水效果,提升泥浆脱水效率,采用单一、复合絮凝剂调理废弃泥浆,通过室内量筒沉积和小型堆载预压试验,对比研究絮凝剂类型和掺量配比对泥浆泥水分离效果的影响,并为脱水效果提供判断依据。结果表明:有机絮凝剂能够改善泥浆的脱水性能,提高泥水分离程度,且存在最优掺量;复合絮凝剂能够发挥有机、无机絮凝剂的协同作用,更进一步提升泥浆脱水程度,其中PAM类复合絮凝剂脱水性能优异,PAM与CaO复合絮凝剂组合处理泥浆时,其沉积层含水率降低程度能够达到82.75%。研究成果可为废弃泥浆的合理处置和资源化利用提供参考。
Abstract
The construction of pile group foundations and underground diaphragm walls generates a significant amount of waste mud. Similarly, the development and utilization of urban underground space, as well as the process of shield tunneling, result in the production of high-moisture mud-like slag. Conventional yard treatment is limited due to cost and environmental concerns. Thus, an efficient dewatering method is needed to reduce waste mud volume. To evaluate the dewatering effect of flocculant conditioning on waste mud and enhance dewatering efficiency, we employed single and composite flocculants to examine the influences of type and dosage of flocculants on mud-water separation and sought to establish a basis for assessing dewatering effectiveness. Our findings demonstrate that organic flocculants enhance dewatering performance and promote mud-water separation, with an optimal dosage. Moreover, composite flocculants exhibit a synergistic effect from both organic and inorganic components, further enhancing dewatering capacity. Specifically, PAM composite flocculant has excellent dewatering performance. The combination of PAM and CaO composite flocculants could reduce the water content in sedimentary layer by 82.75%.
关键词
泥浆 /
有机絮凝剂 /
复合絮凝剂 /
泥水分离 /
脱水效果 /
堆载预压 /
评价指标
Key words
mud /
organic flocculant /
composite flocculant /
mud-water separation /
dewatering effect /
heap load preload /
evaluation index
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参考文献
[1] 朱瑜星, 卞 怡, 闵凡路, 等. 地铁盾构渣土改良为流动化土进行应用试验研究[J]. 土木工程学报, 2020, 53(增刊1): 245-251. (ZHU Yu-xing, BIAN Yi, MIN Fan-lu, et al. Improvement of Metro Shield Muck to Controlled Low-strength Material[J]. China Civil Engineering Journal, 2020, 53(Sup.1): 245-251.(in Chinese))
[2] 徐佩佩. 建筑泥浆高效综合脱水技术研究[D]. 南京: 东南大学, 2015. (XU Pei-pei. Highly Efficient Comprehensive Dehydration Technique for Construction Mud[D]. Nanjing: Southeast University, 2015. (in Chinese))
[3] HUANG Y, DONG C, ZHANG C, et al. A Dredged Material Solidification Treatment for Fill Soils in East China: A Case History[J]. Marine Georesources & Geotechnology, 2017, 35(6): 865-872.
[4] 房 凯,张忠苗,刘兴旺,等.工程废弃泥浆污染及其防治措施研究[J].岩土工程学报,2011,33(增刊2):238-241.(FANG Kai,ZHANG Zhong-miao,LIU Xing-wang,et al. Pollution of Construction Waste Slurry and Prevention Measures[J]. Chinese Journal of Geotechnical Engineering,2011,33(Sup.2):238-241.(in Chinese))
[5] 李 杰,杨文俊,景思雨,等.黏性泥沙絮凝研究现状与进展[J].raybet体育在线
院报,2022,39(4):8-13.(LI Jie,YANG Wen-jun,JING Si-yu,et al.Research Status and Progress of Cohesive Sediment Flocculation[J]. Journal of Yangtze River Scientific Research Institute,2022,39(4):8-13.(in Chinese))
[6] LEI H, XU Y, LI X, et al. Effect of Polyacrylamide on Improvement of Dredger Fill with Vacuum Preloading Method[J]. Journal of Materials in Civil Engineering, 2019, 31(9):04019193.
[7] ZHANG R J,ZHENG Y L,ZHENG J J,et al.Flocculation-Solidification Combined Method for Treatment of Hydraulically Dredged Mud at Extra High Water Content[J].Acta Geotechnica,2020,15(6):1685-1698.
[8] 郑耀林, 章荣军, 郑俊杰, 等. 絮凝-固化联合处理超高含水率吹填淤泥浆的试验研究[J]. 岩土力学, 2019, 40(8): 3107-3114. (ZHENG Yao-lin, ZHANG Rong-jun, ZHENG Jun-jie, et al. Experimental Study of Flocculation-solidification Combined Treatment of Hydraulically Dredged Mud at Extra High-water Content[J]. Rock and Soil Mechanics, 2019, 40(8): 3107-3114.(in Chinese))
[9] 章荣军, 蒋达飞, 郑俊杰. 絮凝调理对淤泥(浆)固结特性的影响[J]. 华中科技大学学报(自然科学版), 2021, 49(7): 1-6. (ZHANG Rong-jun, JIANG Da-fei, ZHENG Jun-jie. Effect of Flocculation Conditioning on Consolidation Characteristics of Mud(Slurry)[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2021, 49(7): 1-6.(in Chinese))
[10]汤德意, 翁浩轩, 史燕南. 水库疏浚底泥絮凝沉降室内试验研究[J]. raybet体育在线
院报, 2018, 35(4): 31-36. (TANG De-yi, WENG Hao-xuan, SHI Yan-nan. Indoor Experimental Study on Flocculation Settling of Dredged Sediment[J]. Journal of Yangtze River Scientific Research Institute, 2018, 35(4): 31-36.(in Chinese))
[11]孙雨涵, 周晓朋, 李 怡, 等. 滨海淤泥质吹填土泥浆絮凝脱水试验研究[J].水道港口,2015,36(4):345-349. (SUN Yu-han, ZHOU Xiao-peng, LI Yi, et al. Experiment Study of Dredger Fill Mud Flocculation Dehydration in Seaside[J]. Journal of Waterway and Harbor, 2015, 36(4): 345-349.(in Chinese))
[12]张志军. 铝盐絮凝剂絮体形态特性研究[D]. 哈尔滨: 哈尔滨工业大学, 2006. (ZHANG Zhi-jun. Research on the Morphological Characteristics of Alumino-Salt Flocculant[D]. Harbin: Harbin Institute of Technology, 2006. (in Chinese))
[13]HE J, CHU J, TAN S K, et al. Sedimentation Behavior of Flocculant-treated Soil Slurry[J]. Marine Georesources & Geotechnology, 2017, 35(5): 593-602.
[14]张跃军,黄娟凤,周 莉,等.不同离子性质絮凝剂在淤泥脱水中的脱水作用特征[J].精细化工,2007,24(9):903-909.(ZHANG Yue-jun,HUANG Juan-feng,ZHOU Li,et al. Dehydration Characteristics of Flocculants with Different Ionic Properties and Molecular Weights in the Processes of Sludge Dehydration[J]. Fine Chemicals,2007,24(9):903-909.(in Chinese))
[15]徐国栋, 吴大志, 王 俊. 工程废弃泥浆的絮凝试验研究[J]. 科技通报, 2021, 37(5): 97-103. (XU Guo-dong, WU Da-zhi, WANG Jun. Experimental Study on Flocculation of Engineering Waste Slurry[J]. Bulletin of Science and Technology, 2021, 37(5): 97-103.(in Chinese))
[16]蒋达飞.絮凝调理对改性淤泥固结特性的影响研究[D]. 武汉:华中科技大学,2021.(JIANG Da-fei. Influnce of Flocculation Conditioning on the Consolidation Characteristics Of Treated Mud[D]. Wuhan: Huazhong University of Science and Technology,2021.(in Chinese))
[17]王东星,伍林峰,唐弈锴,等.建筑废弃泥浆泥水分离过程与效果评价[J]. 浙江大学学报(工学版),2020,54(6):1049-1057.(WANG Dong-xing,WU Lin-feng,TANG Yi-kai,et al. Mud-water Separation Process and Performance Evaluation of Waste Slurry from Construction Engineering[J]. Journal of Zhejiang University (Engineering Science),2020,54(6):1049-1057.(in Chinese))
[18]王东星, 唐弈锴, 伍林峰. 疏浚淤泥化学絮凝-真空预压深度脱水效果评价[J]. 岩土力学, 2020, 41(12): 3929-3938. (WANG Dong-xing, TANG Yi-kai, WU Lin-feng. Evaluation on Deep Dewatering Performance of Dredged Sludge Treated by Chemical Flocculation-vacuum Preloading[J]. Rock and Soil Mechanics, 2020, 41(12): 3929-3938.(in Chinese))
基金
国网江苏省电力有限公司科技项目(J2020070)
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