Saline-alkali soil heavy metal ion remover and preparation method thereof

Abstract

The invention discloses a saline-alkali soil heavy metal ion remover and a preparation method thereof. The saline-alkali soil heavy metal ion remover comprises the following raw material components byweight: 30-45 parts of mineral source humus ultrafine powder, 5-10 parts of a phanerochaete chrysosporium extracellular polymeric substance, 4-8 parts of cyanobacteria liquid, 15-20 parts of lignin grafted polyacrylonitrile, 5-10 parts of citric acid, 20-25 parts of straw powder, and 15-20 parts of desulfurized gypsum. The mineral source humus ultrafine powder in the soil desalting agent can improve the air permeability and water permeability of soil and strongly adsorb various heavy metal ions, also has strong water retention and storage capacity, and improves the landform of saline-alkali soil, so that the saline-alkali soil can adapt to more and more plant growth, and the selectivity of agricultural planting is improved.

Description

technical field [0001] The invention relates to the technical field of saline-alkali soil improvement, in particular to a saline-alkali soil heavy metal ion remover and a preparation method thereof. Background technique [0002] Coastal saline-alkali land is mainly formed due to the impact of seawater, soil transpiration, land reclamation projects, deforestation, and salt production from surrounding lakes. Its characteristics are mainly reflected in factors such as high soil salinity, high groundwater level, and low natural desalination rate of soil. Freshwater resources are scarce, hydrology has diurnal and seasonal changes, vegetation species diversity and quantity are poor, native tree species and saline-alkali-resistant tree species grow slowly, and cannot quickly form forests. In terms of climate, the ecological environment is easily affected by typhoons, sea tides, salt dust, and salt spray. [0003] The treatment technologies for heavy metal pollution in saline-alka...

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Problems solved by technology

[0003] The treatment technologies for heavy metal pollution in saline-alkali soil mainly include phytoremediation, microbial remediation, chemical remediation, and physical remediation. Among them, phytoremediation technology has the advantages of low cost and environmental protection, but it takes a long time to repair; most of the microbial remediation is only for surrounding areas. The degradation of heavy metals does not consider reducing the absorption of crops, and the simple microbial restoration cycle is relatively long; the advantage of chemical restoration is that it can remove pollutants in the soil, but the disadvantage is that there may be secondary pollution; physical restoration techniques such as soil replacement and guest soil restoration The efficiency is high, but the pollutants are only transferred from A to B, the repair cost is high, and the risk in the transfer process is relatively high

[0004] Due to the particularity of soil properties in saline-alkali land, it is difficult to apply phytoremediation and chemical remediation, but the cost of physical remediation is high. Therefore, the main consideration at present is that the distribution of heavy metals in saline-alkali soil is relatively scattered. At present, some microbial remediation is aimed at the soil surface and shallow The heavy metals in the soil layer are removed, and some adopt the combination of adsorption and microbial treatment, but the adsorption capacity of the adsorbents used is relatively weak, and it is difficult to achieve a comprehensive removal of heavy metals in the soil.

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