Dewatering Effect of Flocculant Conditioning Waste Mud under Self-Weight/Loading Conditions

HAN Chao; YU Yue-zhong; BAI Bin; XIAO Han; FAN Zhou; WU Wei; SUN Ke

doi:10.11988/ckyyb.20220930

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Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (2) : 115-122. DOI: 10.11988/ckyyb.20220930

Rock Soil Engineering

Dewatering Effect of Flocculant Conditioning Waste Mud under Self-Weight/Loading Conditions

HAN Chao¹, YU Yue-zhong¹, BAI Bin¹, XIAO Han¹, FAN Zhou¹, WU Wei¹, SUN Ke¹

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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%.

Key words

mud / organic flocculant / composite flocculant / mud-water separation / dewatering effect / heap load preload / evaluation index

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HAN Chao, YU Yue-zhong, BAI Bin, XIAO Han, FAN Zhou, WU Wei, SUN Ke. Dewatering Effect of Flocculant Conditioning Waste Mud under Self-Weight/Loading Conditions[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(2): 115-122 https://doi.org/10.11988/ckyyb.20220930

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