Research Status and Prospects of Fly Ash for Improving Saline-Alkali Land
In the context of rapid agricultural development in our country,saline-alkali soil has seriously restricted effec-tive land use and crop growth.Therefore,how to effectively improve saline-alkali soil has become an urgent problem in agricul-tural production.Fortunately,fly ash,an important industrial waste resource,has been proven to have extensive agricultural val-ue and has potential applications in saline-alkali soil improvement.Through a systematic review of the production and physico-chemical properties of fly ash,the physicochemical properties of saline-alkali soils under the influence of fly ash,the potential hazards of fly ash,and research on soil conditioning,the characteristics and potential performance of fly ash have been summa-rized.The mechanism of fly ash in the improvement of saline-alkali soils has been explored,and the role of fly ash in the process of soil improvement has been elaborated.The research shows that saline-alkali soil is mainly caused by high salt con-tent,which leads to soil particle agglomeration,making the soil compact,heavy in weight,prone to compaction,and difficult to breathe and drain.This ultimately leads to the difficulty of microbial survival,nutrient absorption,accumulation,and decomposi-tion.Fly ash,with its unique characteristics of small particle size,light weight,porosity,and the presence of silicon,aluminum,and calcium elements,physically unblocks the clogged pores in saline-alkali soil,promotes the formation of aggregates,reduces bulk density,and chemically promotes ion leaching and ion exchange with saline-alkali soil,reducing pH value and sodium ion content.When combined with organic fertilizer,humic acid,and activated sludge,it can make up for the deficiencies of nutri-ents and organic matter in saline-alkali soil.On the basis mentioned above,the future directions and challenges to be addressed in the improvement of saline-alkali land using fly ash are pointed out:① Scientific physicochemical analysis of fly ash should be conducted to more effectively carry out multi-component modification processing and compound functional materials,and comprehensive utilization schemes should be proposed in combination with various types of saline-alkali soils;② Conduct envi-ronmental pollution assessment before and after the improvement of saline-alkali soil with fly ash,particularly the evaluation of heavy metal occurrence characteristics and forms,to ensure the safety and scientific utilization of the soil;③ Based on the actu-al field application results of fly ash and saline-alkali soil for many years,formulate relevant product standards,technical speci-fications,and evaluation systems.Through the above research,it provides reference and suggestions for further promoting the practice of saline-alkali soil improvement and the utilization of fly ash resources in agricultural production,thereby achieving the environmentally friendly and resourceful utilization of fly ash.
NETL
NSTL
万方数据
