Method for inhibiting plants from absorbing soil fluorine by using activated sludge modified clay mineral

Abstract

The invention relates to a method for inhibiting plants from absorbing soil fluorine by using activated sludge modified clay mineral. According to the technical scheme, the method comprises the following steps of (1) measuring and putting clear water into a container, adding a certain amount of glucose, calcium superphosphate and urea, and fully stirring the mixture for dissolution; (2) collectingactivated sludge in a biochemical pond of a municipal sewage treatment plant to serve as a strain, putting the activated sludge into the container in the step (1), adding clay mineral and stirring the mixture uniformly, and then carrying out intermittent aeration; (3) after aeration is finished, adding calcium chloride and stirring the mixture uniformly, and standing and precipitating; (4) aftercollecting precipitate obtained through separation in the step (3), rinsing the precipitate with clear water and then carrying out high-temperature treatment to obtain the activated sludge modified clay mineral; and (5) adding the activated sludge modified clay mineral to a tillage layer of fluorine-polluted soil, turning and mixing the soil, and then carrying out conventional cultivation of the plants. According to the method, operation is simple, cost is low, and the fluorine element in the soil can be fixed in the spatial structure of the clay mineral, so that the absorption of the plants is effectively inhibited.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, in particular to a method for inhibiting plants from absorbing soil fluorine by modifying clay minerals with activated silt. Background technique [0002] Although fluorine (F) is one of the trace elements in the normal physiological activities of the body, excessive intake of humans can cause fluorosis symptoms such as skeletal fluorosis, dental fluorosis, and brain damage, which is called endemic fluorosis, commonly known as ground fluorosis. Fluorosis. The disease is a typical geochemical disease and affects many countries and regions in the world. my country is a country with high distribution of endemic fluorosis. Endemic fluorosis is usually divided into four categories: drinking water type, food type, coal burning type and mixed type. Endemic fluorosis caused by soil fluorine pollution is a mixed type, that is, soil fluorine pollution can contaminate shallow groundwate...

AI Technical Summary

Problems solved by technology

[0005]The above method uses exogenous industrial substances, and extra care must be taken during the operation, as there is a certain risk of secondary pollution to the soil

In addition, the remediation of fluorine-contaminated soil is mainly aimed at water-soluble fluorine. Although the absorption of nutrients in the soil by plant roots is somewhat related to the water-soluble state, as a biological transport method, the length of the molecular chain, molecular weight, surface base of the absorption object Factors such as the nature of the group have a great influence on the

[0006]Therefore, it is of great significance to remediate soil fluorine pollution and reduce its impact on human health. However, there are certain limitations in the current remediation technology, and the development of inhibition of plants absorbing soil The method of fluorine has feasibility and application prospect

Images