地下环境中胶体促使下的污染物运移研究进展

大量的研究证据表明,胶体能促使地下环境中污染物的运移。胶体的沉积、释放和运移等动力学过程受许多因素的控制,如胶体的表面性质(亲水或疏水)、胶体的稳定性、水溶液的化学组分、离子强度、pH值和水的流速等。许多研究者已提出了考虑不同影响因素的模型从理论上或用实验室土柱试验来模拟胶体的运移行为。在未来应加强野外条件下不同类型的天然介质中胶体促使下污染物运移的影响因素、作用机制和运移过程的研究,这有助于人们提出有效的策略或发展新的治理技术以防止污染的扩大或修复污染,最终达到保护地下环境的目的。

COLLOID-FACILITATED TRANSPORT OF CONTAMINANTS IN SUBSURFACE ENVIRONMENT

A large volume of information available indicates that colloid facilitates transport of contaminants in subsurface environment. The dynamic processes of colloid deposition, release and transport etc., were dominated by a number of factors, such as colloidal surface property (hydrophilic or hydrophobic), colloidal stability, chemical composition of solution, ion strength, pH, and water flow velocity, etc. The models considering different factors were developed and used to simulate colloidal transport behavior in theory or in laboratory with column experiments. In order to work out effective strategies or to develop novel remediation technologies for preventing pollution extension or remedying pollution, attentions should be paid to colloid-facilitated transport of contaminants in fields.