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Method for removing soil heavy metal pollution at low cost

A heavy metal, low-cost technology, applied in the restoration of polluted soil, etc., can solve the problems of ineffective promotion, poor cleaning effect, secondary pollution, etc., and achieve the effects of reducing fertilization costs, saving costs, and avoiding waste

Active Publication Date: 2013-06-12
GUANGDONG DAZHONG AGRI SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the above technologies have the problems of high cost, poor cleaning effect, and secondary pollution, and cannot be effectively promoted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step A, during the rice fertilization period, a heavy metal scavenger is applied to the water in the paddy field, and the heavy metal in the paddy field is released into the water;

[0039] Step B, making the water in the paddy field flow concentratedly to the water storage area, adding activated carbon and nano-magnesium oxide to the water storage area to adjust the pH value of the water storage area and absorb heavy metal precipitation;

[0040] Step C, making the supernatant liquid in the water storage area flow to another paddy field, and the nutrients in the supernatant liquid can be reused;

[0041] Step D: Harmless treatment of heavy metal deposits in the water storage area.

[0042] Wherein, the heavy metal scavenger is made up of the following raw materials in parts by weight: 15 parts of ammonium chloride, 15 parts of ammonium sulfate, 35 parts of ammonium bicarbonate, 35 parts of ammonium nitrate.

[0043] After 3 removals, the heavy metal content in the soi...

Embodiment 2

[0046] Step A, during the rice fertilization period, a heavy metal scavenger is applied to the water in the paddy field, and the heavy metal in the paddy field is released into the water;

[0047] Step B, make the water in the paddy field flow concentratedly to the water storage area, add activated carbon and nano-magnesium oxide to the water storage area, adjust the pH value of the water storage area and absorb heavy metal precipitation;

[0048] Step C, making the supernatant liquid in the water storage area flow to another paddy field, and the nutrients in the supernatant liquid can be reused.

[0049] Wherein, the heavy metal scavenger is made up of the following raw materials in parts by weight: 25 parts in ammonium chloride, 25 parts in ammonium sulfate, 25 parts in ammonium bicarbonate, 25 parts in ammonium nitrate.

[0050] After 4 removals, the heavy metal content in the soil has met the relevant national standards.

[0051] Example 3.

Embodiment 3

[0053] Step A, during the rice fertilization period, a heavy metal scavenger is applied to the water in the paddy field, and the heavy metal in the paddy field is released into the water;

[0054] Step B, making the water in the paddy field flow concentratedly to the water storage area, adding activated carbon and nano-magnesia to the water storage area to adjust the pH value of the water storage area and absorb heavy metal precipitation;

[0055] Step C, making the supernatant liquid in the water storage area flow to another paddy field, and the nutrients in the supernatant liquid can be reused;

[0056] Step D: Harmless treatment of heavy metal deposits in the water storage area.

[0057] Wherein, the heavy metal scavenger is made up of the following raw materials in parts by weight: 35 parts of ammonium chloride, 35 parts of ammonium sulfate, 15 parts of ammonium bicarbonate, 15 parts of ammonium nitrate.

[0058] After 2 cleanings, the heavy metal content in the soil has ...

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PUM

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Abstract

The invention relates to the technical field of soil heavy metal pollution treatment, in particular to a method for removing soil heavy metal pollution at low cost. A heavy metal cleaning agent can effectively promote dissolving and elution of heavy metal in soil, the heavy metal is absorbed / dissolved from the surface of soil grains and is released into water, water containing the heavy metal is drained to a water-storing area together, and the high-concentration heavy metal soil is treated in a short time. The characteristic that irrigation and nutrition supplement are required during a fertilizing period is fully used, the added heavy metal cleaning agent contains nutrition for the growth of rice, a large amount fertilizer can be timely supplied to the soil, and the fertilizing cost is reduced. The supernatant liquid of a water-storing area flows to another rice field, nutrient contents in the supernatant liquid are used again, and waste is avoided. Heavy metal precipitates in the water-storing area are harmlessly treated, secondary pollution is not caused, the heavy metal cleaning agent is a friendly fertilizer for the environment of the field, and the problem of secondary soil pollution caused after repairing is not caused.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution treatment, in particular to a low-cost method for removing heavy metal pollution from soil. Background technique [0002] Heavy metals in polluted soil mainly include mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr) and other elements with significant biological toxicity. Mainly come from pesticides, wastewater, sludge and atmospheric deposition, etc. For example, mercury mainly comes from mercury-containing wastewater, cadmium and lead pollution mainly comes from smelting emissions and vehicle exhaust gas deposition. Excessive heavy metals can cause plant physiological dysfunction and nutritional imbalance. For example, mercury can weaken and inhibit the activities of nitrifying and ammonifying bacteria in the soil, affecting nitrogen supply. Heavy metal pollutants have little mobility in the soil, are not easy to leach with water, and are not degraded by microorganisms. A...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 林小明
Owner GUANGDONG DAZHONG AGRI SCI CO LTD