Method for removing and adsorbing heavy metals from ciliate desert-grasses

Abstract

The invention discloses a method for removing and adsorbing heavy metals from ciliate desert-grasses. The method comprises the following steps: (1) pretreatment of the ciliate desert-grasses: mincing the ciliate desert-grasses, performing hermitical fermentation at 55 to 70 DEG C for 3 to 5 days, adding 3 to 5 parts of a mixed bacteria leavening agent, and performing secondary filtering treatment, thus obtaining filtrate and filter residues; (2) extraction treatment of the filter residues; (3) adsorption treatment: mixing an extracting solution with the filtrate, then putting the mixture into a high pressure reactor, adding mercaptochemical modified sepiolite, heating the mixture to 45 to 52 DEG C, feeding carbon dioxide-nitrogen mixed gas, enabling reaction under conditions that the pressure is 0.8 to 2 MPa and the stirring speed is 100 to 300 r / min for 4 to 7 hours, performing filtering, and obtaining a solid which is heavy metal-enriched modified sepiolite. According to the method disclosed by the invention, the heavy metal-enriched ciliate desert-grasses can be efficiently recycled; a new way is provided for subsequent treatment of the ciliate desert-grasses; and the application prospect of the ciliate desert-grasses is expanded.

Description

【Technical field】 [0001] The invention relates to the field of plant recovery and treatment, in particular to a method for removing and adsorbing heavy metals from centipede grass. 【Background technique】 [0002] In recent years, the problem of heavy metal pollution in the environment has attracted widespread attention. Excessive accumulation of heavy metals in the soil will lead to crop yield reduction, pollute water bodies and the atmosphere, and also endanger human health. There are two main sources of heavy metals in soil: one is natural sources, which enter the environment through rock weathering or volcanic eruptions; the other is anthropogenic sources, which are caused by human smelting, mining, coal burning, wood preservatives and pesticides. of. [0003] In the current research, there are three main methods for remediation of heavy metal contaminated soil: physical remediation, chemical remediation and biological remediation. In recent years, bioremediation techno...

AI Technical Summary

Problems solved by technology

The current follow-up treatment of centipede grass enriched in heavy metals is mainly incineration treatment and leaching treatment. The former has a limited application range due to large equipment consumption, a large amount of smoke and dust, and the inability to recycle heavy metals. The latter is due to its efficient recovery of heavy metals. Highly respected for its ability, but also faces the problem of high extraction cost

Images