Effect of Hydrothermal Products from Vegetable Waste on Soil Physicochemical Properties
Vegetable waste is rich in nutrition and large in yield,but the direct utilization efficiency is not high.Hydrothermal treatment technology can realize its reduction,resource utilization,and recycling,thereby greatly reducing its environmental application risk.The hydrothermal products of vegetable waste treated at 180,210 and 240℃were used as organic improvement fertilizer to conduct a pot experiment on the soil for 35 d.The results showed that the soil pH value changed slightly with the extension of culture time,but the EC value increased to 0.833 mS/cm;the organic matter content rose first and then decreased,with the maximum value being 10.30 g/kg;the content of nitrogen,phosphorus,and potassium was gradually increased,with the total nutrient content reaching up to 3.43%;the soil microorganisms were mainly beneficial bacteria such as Proteobacteria and Firmicutes.The solid by-products produced by high temperature hydrothermal treatment of vegetable waste can serve as an agricultural fertilizer,exhibiting good characteristics for improving alkaline soil.The optimum temperature required for this process was 210℃.
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