RU2770693C1 - Method for biological treatment of soils contaminated with heavy metals - Google Patents

Abstract

FIELD: biology.

SUBSTANCE: invention relates to the field of biology and environmental ecology. The method for biological treatment of soils contaminated with heavy metals includes sowing mustard seeds in the amount of 1.95-24.3 million pieces per hectare, mowing and removing green mass until flower-bearing shoots form. At the beginning of the formation phase of the rosette of mustard leaves, EDTA is applied to the soil at a dose of 7.5 kg per ha.

EFFECT: increasing the efficiency of soil cleaning from heavy metals: copper, zinc, lead and nickel.

1 cl, 1 tbl, 2 ex

Description

The invention relates to the field of biology, environmental ecology, in particular to the field of biological treatment of soils contaminated with heavy metals.

Known phytoremediation method of biological treatment of soils contaminated with heavy metals, including sowing plant seeds in contaminated soil, mowing and removing green mass, characterized in that the seeds of dandelion are sown in the amount of 1.95-24.3 million pieces per 1 hectare, after the germination of plant seeds is brought to the phase of formation of a rosette of leaves, and mowing and removal of green mass is carried out repeatedly until seeds are formed. (RU No. 2231944, 04/10/2007).

The disadvantage of this method is the relatively low efficiency of soil purification from heavy metals.

For the prototype, a method for biological purification of soils from heavy metals was chosen, including sowing seeds of dandelion officinalis in the amount of 1.95-24.3 million pcs. /ha, mowing and removal of green mass before the formation of flower-bearing shoots. At the beginning of the formation phase of the rosette of leaves, boric acid is introduced into the soil in doses of 0.5-10.0 kg⋅ha ^-1 (RU No. 2342822, 10.01.2009).

The disadvantages of this is the relatively low efficiency of soil purification from heavy metals.

The objective of this invention is to develop a highly efficient method for cleaning soils from heavy metals.

EFFECT: increased efficiency of soil cleaning from heavy metals.

The technical result is achieved by a method of biological treatment of soils contaminated with heavy metals, including sowing seeds in the amount of 1.95-24.3 million pieces per hectare, mowing and removing green mass until the formation of flower-bearing shoots and introducing acids into the soil, characterized in that as seeds, mustard seeds are used, EDTA is applied to the soil at a dose of 7.5 kg per hectare at the beginning of the mustard leaf rosette formation phase. Characteristics of the EDTA preparation:

EDTA is a white solid that is highly soluble in water. Chemical formula of EDTA: C ₁₀ H ₁₂ N ₂ Na ₄ O ₈ 2H ₂ O

Physicochemical characteristics.

Appearance: white crystalline solid

Relative density: 0.7 g/ ^cm3

Molar mass: 380.170 g mol/l

Melting point: 240°C

Solubility: soluble in water 100-110 g/100 ml at 20°C

An example of a specific implementation.

Example 1

The soil is sown with seeds of mustard plants, 1.95 million pieces per hectare. At the beginning of the formation phase of the rosette of mustard leaves, EDTA is applied to the soil at a dose of 7.5 kg per hectare. During the period when the plants gained a large vegetative mass before the formation of flowering shoots, it was disposed of. The dry weight of the aerial part of the plant was also determined.

Example 2

The soil is sown with 24.3 million seeds of mustard plants per hectare. At the beginning of the formation phase of the rosette of mustard leaves, EDTA is applied to the soil at a dose of 7.5 kg per ha. During the period when the plants gained a large vegetative mass before the formation of flowering shoots, it was disposed of. The dry weight of the aerial part of the plant was also determined.

Data on the content of heavy metals in the soil before and after biological treatment using mustard and EDTA, mg*kg ^-1 soil, MAC in soil (MAC of the chemical taken according to GOST No. 02-233 10.12.90) are presented in the table.

Thus, the claimed method of biological purification of soil contaminated with heavy metals provides an increase in the efficiency of soil purification from heavy metals.

Claims (1)

A method for biological treatment of soils contaminated with heavy metals, including sowing seeds in the amount of 1.95-24.3 million pieces per hectare, mowing and removing green mass until flower-bearing shoots form, introducing acids into the soil, characterized in that seeds are used as seeds mustard, and as acids, EDTA is applied to the soil at a dose of 7.5 kg per ha at the beginning of the mustard leaf rosette formation phase.