改性富磷污泥灰固稳铅污染土宏微观特性演化规律及机理

Remediation of heavy metal contaminated sites has attracted considerable attention. Multidisciplinary theories of microscopic analysis, rock and soil mechanics, seepage mechanics and environmental geotechnical engineering are applied to solve the key scientific problems of macro- and microcosmic characteristics evolution of the lead contaminated soil solidified/stabilized (S/S) by P-rich incinerated sewage sludge ash (ISSA). The mechanism of phase transformation and microstructure evolution during S/S process of ISSA treated lead contaminated soil is elaborated by a series of experiments and theory analysis. The stabilization mechanisms of lead and interaction principles between ISSA, lead and soil are analyzed. Besides, variations of engineering properties, such as strength and hydraulic properties, during the S/S process are quantificationally described. Micro-mechanism of engineering properties change during the S/S process of lead contaminated soil is analyzed. Finally, an unified model for characterizing dynamic evolutionary process of macroscopic mechanical properties and micro-structural features of S/S samples is established. Results would be significant for the theory and engineering application on lead contaminated soil disposal and recycling.

重金属污染场地修复受到越来越广泛的关注。针对改性富磷污泥灰固稳铅污染土宏微观特性演化过程中的关键科学问题，基于先进的微观分析手段与岩土力学、渗流力学和环境岩土工程学等理论与学科的交叉融合，通过一系列试验研究和理论分析，揭示改性富磷污泥灰固稳铅污染土过程相变及微观结构特性演化机制；分析改性富磷污泥灰—铅—土壤相互作用原理和铅稳定化机理；探索铅污染土固稳过程强度、水力等工程特性的多参数影响规律及定量表征方法；分析铅污染土固稳过程工程特性演化规律的微观机制；构建铅污染土固稳过程宏微观特性演化的统一分析模型。研究成果对于铅污染土安全处理及资源化利用具有重要的理论意义和工程价值。

重金属污染场地修复受到越来越广泛的关注。本项目以揭示改性富磷污泥灰固稳铅污染土过程宏微观特性演化规律及机理为目标，以构建宏微观统一分析模型来定量分析和表征改性富磷污泥灰固稳铅污染土过程微观结构特性演化机理与宏观工程特性发展规律为手段。通过多批次宏微观特性试验和理论分析，分析了污泥焚烧灰理化特性，探讨了其作为重金属污染土固化材料的可行性；采用碱改性污泥焚烧灰，分析了改性过程污泥焚烧灰强度演化规律，揭示了污泥焚烧灰改性机理；开发了污泥焚烧灰基固化材料，揭示了铅污染土固化稳定化过程工程和环境特性演化规律；探明了污泥焚烧灰对重金属铅的作用效应，揭示了污泥焚烧灰-铅相互作用机理；探明了有机酸改性污泥焚烧灰稳定化铅污染土作用效应，揭示了改性污泥焚烧灰稳定化铅污染土机理；采用改性污泥灰固化稳定化处理含重金属海泥，系统揭示了固稳过程工程、环境和微观结构特性演化规律；构建了铅污染土固稳过程工程与环境特性演化统一分析模型。成果为重金属铅污染土安全处理及资源化利用提供理论依据和技术支持。.研究成果发表SCI论文8篇，EI论文5篇，英文专著1部；授权发明专利2项；主编国家与行业规范1部；协助培养博士研究生2名，硕士研究生1名。