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.