In-situ passivation technology for eutrophication lake sediment

The invention discloses an in-situ passivation technology for eutrophication lake sediment. The technology includes the steps of implementing a preparation method of a passivator, adding the passivator in the field and performing a field experiment with the passivator. Compared with the prior art, the passivator is added into a polluted water region after exogenous pollution is cut off, the passivator adsorbs nutritive salt in water and the sediment and meanwhile forms a passivation layer on the surface layer of the sediment, supply of nutriments to overlying water is reduced under the effects of surface adsorption, ion exchange, physical obstruction and the like, and therefore the purpose of controlling eutrophication of the water is achieved; the technology has the advantages that material preparation is easy, cost is low, field implementation is convenient, the remediation effect is obvious, the application range is wide, no toxicity exists for aquatic organisms, and no secondary pollution is caused; the technology overcomes the defects of the prior art and has application and popularization value.