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A kind of fast passivation method of heavy metal in organic fertilizer/agricultural soil

An organic fertilizer and heavy metal technology, applied in the direction of organic fertilizer, the restoration of polluted soil, agriculture, etc., can solve the problems of slow onset, large amount of use, low utilization efficiency, etc., to alleviate soil acidification, reduce effectiveness, improve The effect of utilization efficiency

Inactive Publication Date: 2017-10-03
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Existing methods using red mud, limestone, sepiolite, etc. can reduce the effectiveness of heavy metals in agricultural soil, but mainly solid particles, the amount of use is large, the effect is slow, uneven, and the utilization efficiency is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Passivation of heavy metal cadmium in chicken manure by calcium formate solution

[0020] The chicken manure with cadmium exceeding the standard (total cadmium 6.1mg / kg, available cadmium 0.76mg / kg) with a pH of 7.3 is subjected to heavy metal passivation treatment: weigh 100g (dry weight) of chicken manure in a 250mL beaker, and then add 50mL of 24mmol / L formic acid The calcium solution is equivalent to adding 12mmol / kg of calcium ions to the chicken manure, and then drying the chicken manure naturally. The measured effective cadmium content in the chicken manure is 0.41mg / kg, which is 46% lower than that before treatment.

Embodiment 2

[0022] Passivation of heavy metal cadmium in chicken manure by ferrous formate solution

[0023] The cadmium-excess chicken manure with a pH of 7.3 (total cadmium 6.1mg / kg, available cadmium 0.76mg / kg) is subjected to heavy metal passivation treatment: weigh 100g (dry weight) of chicken manure in a 250mL beaker, and then add 50mL of 8mmol / L formic acid The ferrous solution is equivalent to adding 4mmol / kg of ferrous ions to the chicken manure, and then the chicken manure is naturally dried, and the effective cadmium content in the chicken manure is determined to be 0.37mg / kg, which is 51% lower than that before treatment.

Embodiment 3

[0025] Passivation of heavy metal cadmium in vegetable field soil by using ferrous formate and calcium formate solution

[0026] The soil of the cadmium-exceeding facilities with a pH of 6.9 (total cadmium 0.62mg / kg, effective cadmium 0.07mg / kg) is subjected to heavy metal passivation treatment: weigh 100g (dry weight) of the soil in a 250mL beaker, and then add 25mL of ferrous formate (8mmol / L) and calcium formate (40mmol / L) solution, is equivalent to adding ferrous ion 2mmol / kg in the soil, calcium ion 10mmol / kg, then naturally dry the soil, the measured soil available cadmium content is 0.04mg / kg, 43% lower than before treatment.

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PUM

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Abstract

The invention belongs to the field of treatment of heavy metal pollution of agricultural soil, and particularly relates to a method for passivating heavy metals in organic fertilizer / agricultural soil by utilizing organic acid salts of iron, manganese, calcium and magnesium. Compared with a method for passivating lime, red mud and the like, the method disclosed by the invention can be used for increasing the passivation rate of the heavy metals and is especially suitable for the quality improvement of the organic fertilizer / protected agricultural soil.

Description

technical field [0001] The invention belongs to the fields of environmental protection and agricultural soil heavy metal pollution control, and specifically relates to a method for quickly passivating heavy metals in organic fertilizer / agricultural soil. Background technique [0002] Part of the agricultural soil is seriously polluted by heavy metals due to the improper treatment of wastewater and solid waste produced by industrial and mining enterprises in the watershed. In the agricultural soil where organic fertilizers and inorganic fertilizers have been applied in large quantities for a long time, such as facility vegetable plots, soil heavy metal pollution is also relatively serious. , the agricultural soil pH under high-intensity utilization tends to decrease, which enhances the phytoavailability of heavy metals in soil. [0003] Heavy metals such as cadmium and lead are more harmful to agricultural production and have a wider range. Take cadmium as an example. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08C05G3/00
CPCB09C1/08B09C2101/00C05F3/00C05G3/00
Inventor 黄斌史奕陈欣
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI