Method for repairing soil polluted by lead and cadmium

Abstract

The invention discloses a method for repairing soil polluted by lead and cadmium. The method comprises following steps: a, at first, sampling polluted soil, and after sampling, carrying out detectionand analysis to obtain the contents of lead and cadmium; b, preparing a catalytic reaction solution, pouring the prepared purifying solution into a solvent bottle, and evenly spraying the solution onpolluted soil; c, preparing a mixture of inorganic substances and organic mushrooms, fully mixing, spraying the mixture on polluted soil, wherein for each mu, 45 kilograms of mixture are used; d, planting inedible plants on the soil, wherein the plants are one or more of Anaphalis flavescens, lotus corniculatus, plantain, cabbage, Erianthus rufipilus, Equisetum ramosissimum, Cyperus rotundus, Cineraria repanda, Saussurea japonica, and Pteris cretica; and e, periodically spraying weak phosphoric acid with a pH value of 6.8 or so on the polluted soil, wherein the spraying period is 2 to 4 days,and the spraying amount is 2 L / mu. Chemical means and biological means are combined to comprehensively process polluted soil, and the purifying effect is good.

Description

technical field [0001] The invention relates to the technical field of environmental purification, in particular to a method for repairing lead and cadmium composite polluted soil. Background technique [0002] Soil pollutants can be roughly divided into two categories: inorganic pollutants and organic pollutants. Inorganic pollutants mainly include acids, alkalis, heavy metals, salts, compounds of radioactive elements cesium and strontium, compounds containing arsenic, selenium and fluorine, etc. Organic pollutants mainly include organic pesticides, phenols, cyanides, petroleum, synthetic detergents, 3, 4-benzopyrene, and harmful microorganisms brought by urban sewage, sludge, and manure. When there are too many harmful substances in the soil and exceed the self-purification capacity of the soil, the composition, structure and function of the soil will change, the microbial activities will be inhibited, and the harmful substances or their decomposition products will gradua...

AI Technical Summary

Problems solved by technology

When there are too many harmful substances in the soil and exceed the self-purification capacity of the soil, the composition, structure and function of the soil will change, the microbial activities will be inhibited, and the harmful substances or their decomposition products will gradually accumulate in the soil through "soil→plant→ Human body", or indirectly absorbed by the human body through "soil → water → human body", to the extent that it endangers human health, that is, soil pollution, in which multiple pollutants exist at the same time in compound pollution, and together produce comprehensive pollution to the atmosphere, soil, organisms and human body. Various pollutants mainly lead and cadmium cause harm to human body, animals, plants, materials, buildings, etc. (that is, produce environmental effects and ecological effects); at the same time, pollutants exist in various chemical states or Interactions, resulting in a comprehensive impact on the environment and ecology (such as photochemical smog), making land pollution more complex and aggravating its harm

[0003] At present, domestic methods for remediating lead and cadmium compound polluted soil are relatively backward, and the treatment effect is poor, which cannot comprehensively improve the soil. In view of the above, a method for remediating lead and cadmium compound polluted soil is proposed here