Research Progress on Preparation and Application of Biochemical Humic Acid
Humic acid is a natural organic polymer with good physiological and reactive activity,and is a good way to deal with soil degradation and heavy metal pollution.Compared with mineral humic acid,biochemical humic acid has the advantages of a wide source of raw material,renewability and low molecular weight.But at the same time,the preparation of biochemical humic acid is also affected by the kinds of raw materials,low yield,easy moisture absorption and other problems,which obstacle its industrial production.In this paper,the preparation methods and influencing factors of biochemical humic acid by biological and chemical methods were reviewed.By comparing their advantages and limitations,the preparation technology to improve the production efficiency of biochemical humic acid was considered.In order to solve the problem of low yield of biochemical humic acid due to the restriction of raw materials,research on the mineral source/biochemical binary compound system of humic acid was introduced.Based on the good physiological and reactive activity of biochemical humic acid,the latest application of biochemical humic acid in agriculture and environmental protection had been summarized.It was suggested that the combination of the hydrothermal and activation methods would be more beneficial to the industrialized production of highly efficient and stable humic acid products.
biochemical humic acidcompound humic acidcomparison of preparation methodsapplication researchprogress
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