Hyperaccumulator-based biochar, and preparation method and application thereof

Abstract

The invention discloses hyperaccumulator-based biochar, and a preparation method and an application thereof. The preparation method of the hyperaccumulator-based biochar comprises the following steps:natural air drying, crushing and anaerobic pyrolysis. The hyperaccumulator-based biochar is prepared by the preparation method. The application is the application of the hyperaccumulator-based biochar in adsorption and solidification of heavy metal ions. A Hyperaccumulator is subjected to anaerobic pyrolysis to prepare the biochar, so that heavy metals in the hyperaccumulator are harmless, and the hyperaccumulator is reutilized; and the hyperaccumulator-based biochar can be used for solidifying and adsorbing heavy metal ions, has the advantages of greenness, energy saving and environmental friendliness, and has a very wide market application prospect.

Description

technical field [0001] The invention belongs to the technical field of hyperaccumulator plant harmlessness, and in particular relates to a hyperaccumulator plant-based biochar and its preparation method and application. Background technique [0002] In recent years, due to the discharge of industrial waste and unreasonable agricultural management measures, heavy metal pollution in soil has become increasingly serious. The heavy metals accumulated in the soil not only cause harm to the soil-plant ecosystem, leading to soil degradation, reduction in the yield and quality of agricultural products, but also pollute surface water and groundwater through runoff and leaching, deteriorating the hydrological environment, and may pass through direct contact and food chains. The enrichment effect of the crisis human health. [0003] The remediation of heavy metal-contaminated soil mainly adopts physical, chemical and biological remediation techniques. [0004] Phytoremediation, also ...

AI Technical Summary

Problems solved by technology

The incineration method is a high-temperature heat treatment technology, which uses a certain amount of excess air to oxidize and burn the organic waste to be processed in the incinerator. In the atmosphere, various chemicals such as chelating agents need to be added during the ash solidification process; as a treatment method, the composting method is used to reduce the biomass and volume of plants, and at the same time it is convenient for transportation and post-treatment, but this method It is easy to produce odor, the fermentation bin system requires high investment, and the composting cycle is also long, and the compost product is also potentially unstable; the compressed landfill method can save a lot of time and reduce the volume, but the plant biomass in the process It is large, difficult to transport, and needs to occupy a specially treated site, with high operating costs and low processing efficiency. At the same time, during the natural decomposition process of stacking, the hazardous waste is not eliminated, and the final product is still risky; It is a treatment method for plants to be violently thermally stimulated under oxygen conditions to instantly decompose the plants, but this method requires a low moisture content of the plant residues and requires high installation, commissioning and operating costs