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Compound conditioner suitable for heavy metal pollution of northern alkaline soil

A technology of heavy metals and conditioners, applied in the restoration of polluted soil, soil conditioning materials, applications, etc., can solve the problems of microbial activity being easily affected by environmental factors, reducing the bioavailability of heavy metals in soil, and passivating heavy metals in soil, etc. The effect of improving soil physicochemical properties, reducing bioavailability and reducing toxic effects

Inactive Publication Date: 2018-06-15
HENAN QINGSHUIYUAN TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

This method helps to improve soil fertility and soil micro-ecological environment, but the microbial activity is easily affected by environmental factors, the survival rate of adding alone is low, and the restoration period is long, which affects the treatment efficiency
The current soil heavy metal pollution passivation agents are mostly aimed at acidic soils in the south, and the bioavailability of heavy metals in the soil can be effectively reduced by applying alkaline materials to increase the soil pH, but for the soils in the north that are alkaline in nature, this method cannot be used To achieve the purpose of passivating soil heavy metals

Method used

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  • Compound conditioner suitable for heavy metal pollution of northern alkaline soil
  • Compound conditioner suitable for heavy metal pollution of northern alkaline soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A plot test was carried out in a heavily cadmium-polluted area in northern China. The physical and chemical properties of the plot soil were: pH value 7.87, total cadmium 3.37mg kg -1 , the total lead is 258.22mg·kg -1 , effective cadmium (DPTA extraction) is 2.01mg·kg -1 , effective lead (DPTA extraction) is 95.62mg·kg -1 .

[0029] The main implementation method of this embodiment is as follows:

[0030] 1) Biochar uses corn stalks as biomass raw materials, pyrolyzes at 400°C for 6 hours under anoxic conditions, pulverizes after cooling, and passes through a 100-mesh sieve; in this example, pyrolysis at 400°C for 6 hours can also be used at 450°C Pyrolysis for 8 hours, or within the range of 6-8 hours at 400-450°C;

[0031] 2) The organic fertilizer is decomposed chicken manure, air-dried and crushed before use, and passed through a 100-mesh sieve;

[0032] 3) The microbial inoculum is a composite microbial inoculum formed by mixing Bacillus subtilis, Bacillus ce...

Embodiment 2

[0041] A plot test was carried out in a mildly cadmium-polluted area in northern China. The physical and chemical properties of the plot soil were: pH value 7.83, total cadmium 1.63mg kg -1 , the total lead is 117.23mg·kg -1 , effective cadmium (DPTA extraction) is 1.05mg·kg -1 , effective lead (DPTA extraction) is 71.35mg·kg -1 .

[0042] Conditioner application was as described in Example 1. The test results are shown in Table 2:

[0043] Table 2 Product test results in moderately polluted soil

[0044]

[0045] The results showed that the soil pH value did not change much under the treatment of the compound conditioner, and the soil available cadmium and available lead content decreased by 67.3% and 57.6% on average compared with the control group; %, greatly reducing the heavy metal content of wheat grains, and the average cadmium and lead content reached the national food safety heavy metal limit standard.

[0046] From the above results, it can be seen that the ...

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Abstract

The invention provides a compound conditioner suitable for heavy metal pollution of northern alkaline soil. The compound conditioner comprises biochar, organic fertilizers, microbial agents and phosphate rock powder, wherein a mass ratio of the biochar to the organic fertilizers to the microbial agents and the phosphate rock powder is (40-65): (30-50): (3-5):(10-25). On account of physical and chemical properties of the northern alkaline soil and characteristics of heavy metal elements, the invention provides the compound conditioner having functions of improving the physical and chemical properties of soil, preventing and treating soil-borne diseases and passivating heavy metals cadmium and lead, as well as a preparation method and a use method of the compound conditioner on the basis ofa current passivation technology by utilizing adsorptive precipitation performance of the biochar, the organic fertilizers and the phosphate rock powder and bacteria inhibiting, phosphorus decomposingand heavy metal passivating capacities of bacilli.

Description

technical field [0001] The invention relates to a composite conditioner suitable for heavy metal pollution in northern alkaline soil. Background technique [0002] The heavy metals that cause pollution to the soil environment mainly include elements with significant biological toxicity such as mercury (Hg), cadmium (Cd), lead (Pb) and metalloid arsenic (As), as well as copper (Cu), which is biologically toxic due to excessive accumulation. , nickel (Ni), zinc (Zn) and manganese (Mn) and other common elements. With the development of society, the discharge of industrial "three wastes", mining, the addition of chemical fertilizers and pesticides, sewage irrigation and discharge of domestic waste, etc. have caused these heavy metal elements to accumulate on the surface of the soil, thus affecting cultivated land, agricultural products and human beings. Health poses a serious safety hazard. The 2014 "National Soil Pollution Survey Bulletin" shows that the rate of soil environm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10C09K101/00
CPCC09K17/40B09C1/08B09C1/10C09K2101/00
Inventor 王志清陈卫平杨海星蔡斌李翠娥李艳玲
Owner HENAN QINGSHUIYUAN TECH
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