Influence Mechanism of Composite Conditioning of Sludge on Dehydration Performance of Mechanical Pressure Filtration

LI Shi-mi; ZHANG Yang; XIA Xin-xing; CHEN Wen-feng; XU Yang-fan

doi:10.11988/ckyyb.20221576

PDF(1388 KB)

Journal of Changjiang River Scientific Research Institute ›› 2024, Vol. 41 ›› Issue (4) : 29-36. DOI: 10.11988/ckyyb.20221576

River-Lake Protection And Regulation

Influence Mechanism of Composite Conditioning of Sludge on Dehydration Performance of Mechanical Pressure Filtration

LI Shi-mi^1,2, ZHANG Yang^1,2, XIA Xin-xing^1,2, CHEN Wen-feng^1,2, XU Yang-fan^1,2

Author information +

History +

Abstract

Dehydration through mechanical pressure filtration is widely used for dehydrating river and lake sludge. The conditioning of the sludge significantly impacts the efficiency of mechanical filtration dehydration. Two common conditioning measures include utilizing flocculant with polyacrylamide (PAM) and employing a compound conditioning approach that combines flocculant with an inorganic conditioner. In recent years, compound conditioning methods have seen rapid development. Studying the impact of single and compound conditioning of flocculants on the efficiency and mechanism of mechanical filtration dehydration is crucial. Focusing on the sludge sourced from Guantian Lake, this study compares the conditioning performance of PAM and LAC and their dehydration performance, and analyzes the dehydration technical parameters in PAM and PAM+LAC conditioning cases. The effect of composite conditioning on the structure of dehydrated sludge cake is also revealed via mercury intrusion test and SEM scanning. Findings indicate that the conditioning agent primarily enhances the filtration and dehydration stages, as evidenced by water loss meter tests aligning well with the plate and frame mechanical filtration press results. The use of LAC as a supplement to PAM can improve the unloading performance of the sludge cake by enhancing conditioning effects. Microscopic analysis revealed that LAC enlarged the pore size of the sludge cake and increased the proportion of open pores.

Key words

sludge / compound conditioning / dehydration mechanism / mercury intrusion test / pore characteristics

Cite this article

EndNote

Ris (Procite)

Bibtex

Download Citations

LI Shi-mi, ZHANG Yang, XIA Xin-xing, CHEN Wen-feng, XU Yang-fan. Influence Mechanism of Composite Conditioning of Sludge on Dehydration Performance of Mechanical Pressure Filtration[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(4): 29-36 https://doi.org/10.11988/ckyyb.20221576

References

[1] 颜昌宙, 范成新, 杨建华, 等. 湖泊底泥环保疏浚技术研究展望[J]. 环境污染与防治, 2004, 26(3): 189-192. (YAN Chang-zhou, FAN Cheng-xin, YANG Jian-hua, et al. Prospect and Progress of the Study on Environmental Dredging Technology of Lake Sediment[J]. Environmental Pollution & Control, 2004, 26(3): 189-192.(in Chinese))
[2] 骆文广,杨国录,陆晶,等.武汉市墨水湖疏浚泥浆脱水固结一体化研究[J].武汉大学学报(工学版),2017,50(2):187-192.(LUO Wen-guang, YANG Guo-lu, LU Jing, et al. Research on Dehydration-solidification Integrative Construction Technique of Bottom Silt in Moshui Lake[J].Engineering Journal of Wuhan University, 2017, 50(2): 187-192.(in Chinese))
[3] 李冲, 吕志刚, 陈洪龄, 等. 河湖疏浚淤泥的表征、絮凝和脱水[J]. 环境工程学报, 2013, 7(2): 737-742. (LI Chong, LÜ Zhi-gang, CHEN Hong-ling, et al. Characterization, Flocculation and Dehydration of Dredged Sludge[J]. Chinese Journal of Environmental Engineering, 2013, 7(2): 737-742.(in Chinese))
[4] 韩超, 俞越中, 柏彬, 等. 自重及加载条件下絮凝剂调理废弃泥浆的脱水效果[J]. 长江科学院院报, 2024, 41(2): 115-122.(HAN Chao, YU Yue-zhong, BAI Bin, et al. Dewatering Effect of Flocculant Conditioning Waste Mud under Self-Weight/Loading Conditions[J]. Journal of Yangtze River Scientific Research Institute, 2024, 41(2): 115-122.(in Chinese))
[5] 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))
[6] 徐迪, 陈立, 张茜, 等. 调质剂对河道淤泥泥水分离性的影响[J]. 科学技术与工程, 2018, 18(34): 253-258. (XU Di, CHEN Li, ZHANG Xi, et al. Influence of Conditioning Agent on Slurry Separation of Silt in River Channel[J]. Science Technology and Engineering, 2018, 18(34): 253-258.(in Chinese))
[7] 施卓. 基于渗水通道的淤泥脱水研究[D]. 武汉: 湖北工业大学, 2021. (SHI Zhuo. Study on Sludge Dewatering Based on Seepage Channel[D].Wuhan: Hubei University of Technology, 2021. (in Chinese))
[8] 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), 2021, 49(7): 1-6.(in Chinese))
[9] CUI Y,ZHU W,WU S,et al.The Role of Lime in Dredged Mud Dewatered by a Plate and Frame Filter Press and Potential Substitutes[J]. Environmental Science and Pollution Research,2021,28(14):17331-17342.
[10] 程福周, 雷学文, 孟庆山, 等. 基于核磁共振技术的疏浚淤泥固化土孔隙水含量及分布研究[J]. 长江科学院院报, 2016,33(10):116-120. (CHENG Fu-zhou, LEI Xue-wen, MENG Qing-shan, et al. Pore Water Content of Solidified Dredging Silt and Its Distribution Based on Nuclear Magnetic Resonance[J]. Journal of Yangtze River Scientific Research Institute, 2016, 33(10): 116-120. (in Chinese))
[11] 于沛然.活性污泥深度脱水过程的跨尺度研究[D].广州:华南理工大学,2020.(YU Pei-ran.Cross-scale Study on Deep Dehydration Process of Activated Sludge[D].Guangzhou: South China University of Technology, 2020. (in Chinese))
[12] 朱涛, 周国标, 周鹏飞, 等. 基于“骨架构建体” 的污泥板框脱水影响因素、改性机理及其节耗分析研究[J]. 环境科学与管理, 2017, 42(10): 80-83. (ZHU Tao, ZHOU Guo-biao, ZHOU Peng-fei, et al. Analysis on Influencing Factors, Modification Mechanism and Energy Saving of Sludge Dewatering Based on Skeleton Builder[J]. Environmental Science and Management, 2017, 42(10): 80-83.(in Chinese))
[13] 李亚林, 陈宁宁, 张诗楠, 等. 三种基于骨架构建体污泥复合调理剂脱水泥饼土工性能研究[J]. 武汉理工大学学报, 2013, 35(5): 122-126. (LI Ya-lin, CHEN Ning-ning, ZHANG Shi-nan, et al. Study on Engineering Properties of Dewatered Sludge with Skeleton Builder by Using Three Kinds Composite Conditioners[J]. Journal of Wuhan University of Technology, 2013, 35(5): 122-126.(in Chinese))
[14] SHEAR D L,OLSEN H W,NELSON K R. Effects of Desiccation on the Hydraulic Conductivity versus Void Ratio Relationship for a Natural Clay[M] ∥Transportation Research Record, Washington DC: Transportation Research Board, 1993.
[15] 桑明明,赵恒泽,吴培益,等.钢渣基多孔地质聚合物的制备及吸附性能研究[J].硅酸盐通报,2022,41(2):562-571,581.(SANG Ming-ming, ZHAO Heng-ze, WU Pei-yi, et al. Preparation and Adsorption Properties of Steel Slag Based Porous Geopolymer[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(2): 562-571, 581.(in Chinese))
[16] RAO B, SU X, QIU S, et al. Meso-mechanism of Mechanical Dewatering of Municipal Sludge Based on Low-field Nuclear Magnetic Resonance[J]. Water Research, 2019, 162: 161-169.
[17] 王曦, 浩婷, 周颜, 等. 真空负载下疏浚淤泥脱水过程中渗流规律的研究[J]. 南水北调与水利科技, 2014, 12(6): 120-122, 144. (WANG Xi, HAO Ting, ZHOU Yan, et al. Research on Seepage Law of Dredged Sludge in Dewatering Process under Vacuum Loading[J]. South-to-North Water Transfers and Water Science & Technology, 2014, 12(6): 120-122, 144.(in Chinese))