Contaminated soil top layer remediation material and preparation method thereof

Abstract

A kind of contaminated soil top repair material, including fly ash, activated sludge, buffer, vermiculite, wherein fly ash, activated sludge, buffer, vermiculite account for fly ash, activated sludge, buffer, vermiculite The percentages by weight of the total stone weight are 35-65%, 30-60%, 0.5-10%, 4-5%, respectively. The preparation method of the above-mentioned restoration material: (1) Mix fly ash with different particle sizes, then add a formulated amount of buffer and mix thoroughly, then add formulated amount of vermiculite and mix thoroughly; (2) combine the steps ( 1) Mix the mixture obtained in the formula with the amount of sludge, add water during the mixing process, and squeeze it hard during the mixing process to make it fully mixed; (3) Add the mixture obtained in step (2) Water, keep the moisture content between 50-80%, keep the temperature between 15-40°C, and carry out fermentation treatment, the fermentation time is 30-60 days; (4) Grind and sieve the mixture obtained after fermentation to form A material with a particle size similar to that of loam. The product prepared by the invention has low cost, good effect and simple process, and is suitable for remediation and improvement of large-area polluted soil.

Description

technical field [0001] The invention relates to a preparation raw material and preparation method of a polluted soil top restoration material, belonging to the field of environmental restoration. Background technique [0002] Top-level restoration materials for polluted soil refer to laying 5-10cm restoration materials on the top layer of contaminated soil, planting specific plants in the restoration materials, and removing heavy metals and organic matter from the contaminated soil through the adsorption of chemical elements, microorganisms and plants in the restoration materials. passivation and removal of harmful substances, so as to achieve the purpose of remediating polluted soil. The remediation materials on the top layer of polluted soil are not only rich in water, fertilizer, gas and other factors to ensure the growth of plants, but also contain the effect of passivating the bioavailability of heavy metals in polluted soil. In the process of remediation, the enrichmen...

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