A kind of aquaculture pond sediment heavy metal stabilizer, its preparation method and application

Abstract

A stabilizer for heavy metals in the sediment in an aquaculture pond. The stabilizer comprises a microbial carrier and a composite microbial agent loaded on the microbial carrier, the microbial carrier being a mixture of Mailuoning herb residue biomass carbon powder, tea residue powder, Alternanthera philoxeroides powder, and a binder; a composite active bacterial liquid is obtained by mixing a sediment sample and deionized water so as to obtain a supernatant diluent, carrying out culturing so as to obtain a seed solution of Bacillus and yeast, adding an EM active bacterial liquid, and carrying out culturing under the condition of aerobic fermentation. The preparation method comprises: (1) converting Mailuoning herb residues into biomass carbon at a high temperature, and then mixing the biomass carbon with raw materials so as to obtain a microbial carrier; and (2) loading a composite microbial agent onto the microbial carrier. The sediment stacked with the heavy metal stabilizer and then fermented can be used as a base fertilizer and applied to soil, so that the fertility of the soil is improved; the effectiveness of heavy metals in the soil is reduced; the amount of an inorganic fertilizer used is decreased; the yield and quality of crops are improved. Also disclosed are a method for preparing a stabilizer for heavy metals in the sediment in an aquaculture pond, and an application of the stabilizer.

Description

technical field [0001] The invention relates to the field of agriculture, in particular to a production method and application of a heavy metal stabilizer for bottom sludge in aquaculture ponds. Background technique [0002] The bottom mud of aquaculture ponds is rich in organic matter, N, P, K and other nutrient elements. It is a high-quality organic fertilizer. It can not only improve soil fertility, but also increase crop yield. However, due to natural or man-made factors such as atmospheric subsidence, surface runoff, unreasonable application of fishing medicine and bait, a large amount of toxic heavy metals enter the aquaculture water environment, and are finally enriched in the sediment through adsorption, precipitation, etc. The heavy metal contents of Pb, Cu, Zn and Cr in the soil were significantly higher than the local soil background value and the content of Cd was seriously exceeded (≥0.5mg / kg). Therefore, if the heavy metals in the sediment are not repaired in ...

AI Technical Summary

Problems solved by technology

Microbial activity is the key factor affecting the stabilization of heavy metals in sediment by microbial inoculation method. At present, most inoculation agents are directly put into the sediment, which may easily cause microbial inactivation or loss. Therefore, the development of new microbial carriers to ensure microbial activity is a main technology of this patent breakthrough

The inventor's previous studies have shown that biomass charcoal has a porous structure and a high specific surface area, and the surface contains various functional groups such as hydroxyl, carbonyl, and carboxyl. It is an excellent microbial immobilization carrier and heavy metal adsorbent, but it is affected by different raw materials and preparation processes. , the physical and chemical properties of the prepared carriers are quite different, and the adsorption and fixation effects on heavy metals are also different.

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