Method for studying influence of biological carbon on cadmium contaminated soil properties and cadmium form

Abstract

The invention discloses a method for studying influence of biological carbon on cadmium contaminated soil properties and a cadmium form. According to the studying method, three biochar is prepared byusing hizikia fusifarme, rice straw and hickory shells as raw materials, adsorbing effects of the three biochar on cadmium in an aqueous solution are compared, and thus the best biochar which absorbscadmium is optimized. The optimized biochar of different dosages is applied into cadmium contaminated soil, changes of basic physical and chemical properties of the cadmium contaminated soil and the chemical form of the cadmium are measured, and passivation effects of the biochar on the physical and chemical properties of the actual cadmium contaminated soil and soil cadmium pollution are preliminarily discussed. The influence of the biochar on the physical and chemical properties of the actual cadmium-contaminated soil and the chemical form of the cadmium is studied. The effective-state Cd content of the soil is reduced, an exchanging state of the soil heavy metal Cd is promoted to be converted into a carbonate binding state, an iron and manganese oxide binding state, an organic binding state and a residue state, the bioavailability and ecological toxicity of the heavy metal Cd are reduced, and thus the harm of the heavy metal cadmium is greatly reduced.

Description

technical field [0001] The invention relates to the research field of biochar on cadmium-contaminated soil, in particular to a research method for the effect of biochar on the properties and forms of cadmium-contaminated soil. Background technique [0002] Soil is the main natural resource on which human beings depend. However, soil heavy metal pollution is becoming more and more serious. Soil heavy metal pollution has a wide range and long duration, and is highly concealed and cannot be biodegraded. Cadmium is one of the most toxic heavy metal elements, and soil cadmium pollution has become a prominent environmental problem. Soil polluted by cadmium will affect the normal physiological metabolism of crops, and then affect human health through the enrichment of the food chain. In recent years, heavy metal cadmium pollution accidents have occurred frequently in my country. For example, the cadmium pollution incident in Liuyang City, Hunan Province in 2006, and the cadmium...

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Problems solved by technology

However, at present, the raw materials for the preparation of biochar are mainly agricultural and forestry wastes, and there are few studies on the preparation of biochar from marine biomass as raw materials.

Moreover, although the research on the remediation effect and mechanism of biochar on soil cadmium pollution has received great attention, most of the research on soil cadmium pollution is mainly carried out by adding exogenous cadmium to soil. There are few studies on the direct passivation of cadmium-contaminated soil, and the impact of biochar application on soil environmental properties and cadmium form changes is still unclear. Relevant theoretical and applied technical research needs to be strengthened urgently.

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