Heavy metal solidification stabilizing agent for polluted bottom mud and preparation method thereof

Abstract

The invention discloses a heavy metal solidification stabilizing agent for polluted bottom mud and a preparation method thereof. The heavy metal solidification stabilizing agent is prepared from the following components: 10 to 15 parts of sodium silicate, 10 to 12 parts of magnesium oxide, 6 to 9 parts of hydroxy carboxylic acid metal chelating agent, 8 to 10 parts of Ca2O2, 18 to 25 parts of CaO,14 to 16 parts of Al2(SO4)3, 8 to 12 parts of FeO, 25 to 30 parts of bone meal, 10 to 14 parts of chitosan, 10 to 13 parts of chitin and 16 to 24 parts of lactic acid; a preparation method of the heavy metal solidification stabilizing agent comprises the following steps: 1) preparing materials; 2) preparing solid particles and grinding; drying ground mixed powder; 3) mixing the treated mixed powder, the bone meal and the lactic acid and pelletizing. According to the heavy metal solidification stabilizing agent disclosed by the invention, a soil framework and a pore structure of the polluted bottom mud is ensured, the releasing of endogenous pollution is reduced, the pH (Potential of Hydrogen) value is regulated, an ecological habitat of substrate microorganisms is improved, and a continuous self-purification capability on overlying water and the endogenous pollution is recovered.

Description

technical field [0001] The invention relates to a solidification stabilizer for heavy metals in polluted bottom mud and a preparation method thereof, and belongs to the technical field of river, lake, pond and other watershed polluted bottom mud treatment. Background technique [0002] In recent years, with the rapid development of China's economy, a large amount of industrial wastewater and domestic sewage have entered rivers, lakes and other water bodies, resulting in serious pollution of rivers and lakes. After pollutants enter rivers and lakes, most of them accumulate in the sediment, causing river 1. The lake sediment is seriously polluted, and the sediment is an important place for material exchange and energy cycle in the water ecosystem. There is a dynamic balance between sedimentation adsorption and desorption release with the water body. When the water environment changes, the sediment in the water body The pollutants will be re-released into the water body and bec...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a solidification stabilizer for heavy metals in polluted bottom mud and a preparation method thereof, which can ensure the soil skeleton and pore structure of polluted bottom mud, reduce the release of endogenous pollution, increase the oxidation-reduction potential of the matrix, adjust the pH value, and improve Substrate microbial habitat can restore the continuous self-purification ability of overlying water and endogenous pollution, which can effectively solve the problems in the background technology

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