淤泥pH调节联合复合絮凝真空脱水试验研究  

Experimental study on pH adjustment combined with composite flocculation vacuum dewatering of sludge

作　　者：崔允亮 杨旭坤 王新泉 魏纲 周建[1,3,4] 李昊东 高楥园 CUI Yunliang;YANG Xukun;WANG Xinquan;WEI Gang;ZHOU Jian;LI Haodong;GAO Xuanyuan(School of Engineering,Hangzhou City University,Hangzhou,Zhejiang 310015,China;College of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan,Anhui 232001,China;Key Laboratory of Safe Construction and Intelligent Maintenance for Urban Shield Tunnels of Zhejiang Province,Hangzhou,Zhejiang 310015,China;Zhejiang Engineering Research Center of Intelligent Urban Infrastructure,Hangzhou,Zhejiang 310015,China)

机构地区：[1]浙大城市学院工程学院,浙江杭州310015 [2]安徽理工大学土木建筑学院,安徽淮南232001 [3]浙江省城市盾构隧道安全建造与智能养护重点实验室,浙江杭州310015 [4]城市基础设施智能化浙江省工程研究中心,浙江杭州310015

出　　处：《岩石力学与工程学报》2024年第7期1788-1798,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(52178399);浙江省基础公益研究计划项目(LGF20E080007)。

摘　　要：传统真空预压法在处理淤泥方面耗时长且脱水效果欠佳,对淤泥进行高效脱水处理并提高资源利用率具有重要意义。提出一种pH调节联合复合絮凝真空预压的复合处理方法,首先通过淤泥比阻试验及沉降柱试验,得到pH调节联合复合絮凝的处理方案,随后开展真空脱水模型试验,进行应用研究以验证其效果。从比阻值、排水量、孔隙水压力及抗剪强度等方面,对该复合技术的作用机制和处理效果进行全面评估分析。结果表明,淤泥在适当的酸性调节后,脱水性能会得到显著改善。当淤泥pH值调节至4.2时,絮凝剂的激发效果较为显著,而复合絮凝相较于单一絮凝表现出更为优越的处理效果;此外,絮凝剂的加入在短时间内改善了淤泥的沉积性能。与传统真空预压法相比,该复合处理方法在排水量、含水率及土体强度等方面的改善效果明显,处理后的土体含水率降低至60%以下,土体更加密实,抗剪强度更是提高了2.7倍,说明该复合处理技术具有良好的体积减容效果和加固效果。The traditional vacuum preloading method is time-consuming and has poor dewatering effects in the treatment of sludge,making it crucial to efficiently dewater the sludge and enhance resource utilization.Therefore,a composite treatment method combining pH adjustment,compound flocculation and vacuum preloading was proposed.The treatment scheme of pH adjustment combined with compound flocculation is obtained through sludge specific resistance tests and settling column tests.Subsequently,vacuum dewatering model experiments are conducted for application to validate the effectiveness of the proposed method.The mechanism and treatment effects of this composite technology are evaluated and analyzed in terms of specific resistance,drainage volume,pore water pressure and shear strength.The results indicate a significant improvement in sludge dewatering performance with appropriate acidic adjustment.When the pH value of the sludge is adjusted to 4.2,the stimulating effect of the coagulant is more significant,and the treatment effect of compound flocculation is much higher than that of single flocculation.In addition,the addition of coagulants can improve the sedimentation performance of sludge in a short period.Compared with the traditional vacuum preloading method,this composite treatment method exhibits remarkable improvements in drainage volume,water content,and soil strength.The water content of the treated soil is reduced to below 60%,resulting in denser soil and a 2.7-fold increase in shear strength,highlighting the excellent volume reduction and reinforcement effects of this composite treatment technology.

关 键 词：土力学 淤泥 真空预压 pH 比阻 絮凝剂 

分 类 号：TU443[建筑科学—岩土工程]