Progress and prospect of arsenic removal by permeable reactive barrier
The arsenic pollution seriously affects the ecological environment and human health.The effective removal and prevention of arsenic pollution is one of the most urgent problems to be solved in the current industrial circles.The permeable reactive barrier(PRB)technology based on in-situ remediation technology,with its advantages of low cost,high efficiency,sustainability and simple process,has been the green,economical and efficient choice for removing and preventing arsenic pollution.As the filling material in PRB project is the main reactive body to remove arsenic pollution,the types of arsenic removal filling materials of PRB and their performance and mechanism of arsenic removal are summarized,including clay minerals,carbon-based materials,calcium-based materials,iron-based materials,solid waste,etc.Of all these materials,the iron-based materials have obvious advantages over others in adsorption ability towards arsenic species.Iron-based materials such as zero-valent iron,iron-containing minerals and iron-containing waste have been widely used in arsenic pollution remediation,due to their advantages of low cost,easy availability and high arsenic removal efficiency,and have been the main research direction of arsenic removal material in PRB in the future.Therefore,the laboratory research and model simulation of PRB filling materials are briefly introduced,including several pilot or project examples of PRB for arsenic removal,illustration of the related operation and monitoring process with treatment effect on arsenic pollution.On this basis,we put forward the development prospects and challenges of PRB technology for arsenic removal filling materials and engineering applications,and we hope that this paper can contribute to the development and progress of PRB technology for arsenic pollution control in overland runoff.
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