Recycling and reuse treatment method and adsorbent for straw waste

Abstract

The invention discloses a method for recycling and reusing straw waste, which comprises the following steps: preparing corn straw and cleaning the corn straw; drying the cleaned corn straw; crushing the dried corn straw to obtain Straw particles; configure zinc chloride solution, add the straw particles to the zinc chloride solution and stir evenly to obtain a straw-zinc chloride solution; perform aging treatment on the straw-zinc chloride solution to obtain an aging treatment product; perform aging treatment on the aging treatment product Vacuum heat treatment to obtain a granular product; grind the granular product into a fine powder, and post-treat the fine powder; put ferric chloride and ferric sulfate into a flask filled with distilled water to fully dissolve, add ammonia solution to obtain trioxide Iron colloidal precipitation; adding the post-treated fine powder into the ferric oxide colloidal precipitation, stirring and standing still to obtain a magnetic mixed solution; filtering the magnetic mixed solution. The soil treatment agent of the invention has high safety, and significantly improves the adsorption capacity and efficiency.

Description

technical field [0001] The invention relates to the field of agricultural technology, in particular to a method for recycling and reusing straw waste and an adsorbent. Background technique [0002] Cadmium is a non-essential element for the human body. It often exists in the form of compounds in nature, and its content is generally very low. Under normal environmental conditions, it will not affect human health. Cadmium and zinc are congener elements, and cadmium often coexists with zinc and lead in nature. When the environment is polluted by cadmium, cadmium can be enriched in organisms and enter the human body through the food chain to cause chronic poisoning. The cadmium content per kilogram of soil is 0.01-2 mg, with an average of 0.35 mg per kg. The concentration of cadmium in the soil near the aluminum smelter and the downwind area is very high, resulting in land waste. The accumulation of cadmium-containing waste residues causes cadmium compounds to enter the soil ...

AI Technical Summary

Problems solved by technology

Although this method can remove cadmium, the subsequent problem is the problem of land salinization. Using this method to solve the problem of cadmium pollution will lead to the abandonment of the whole land

In addition, there are some soil treatment agents as proposed in the aforementioned patented technology. Although these soil treatment agents can solve the problem of cadmium pollution to a certain extent, these treatment agents themselves also contain some toxic metal ions (although these metal ions toxicity is lower than that of cadmium ions), and although some biological treatment agents do not contain toxic substances, the biological treatment agents often have poor treatment effects

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