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Oyster shell soil remediation agent and preparation method thereof

A technology of soil remediation agent and oyster shell, which is applied in the field of oyster shell soil remediation agent and its preparation, can solve the problems of secondary gas pollution, high cost of industrialization, and high treatment cost, and achieve the improvement of heavy metal adsorption capacity and large The micropore area and the effect of improving the composition of soil nutrients

Active Publication Date: 2020-12-01
厦门康浩生态农业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, according to the organic components and properties of oyster shells, scholars have used crushing and modification technologies to conduct a series of explorations on its recycling, such as calcium additives, soil conditioners, heavy metal adsorption and removal, sewage treatment materials, etc., some It has been put into production and use, but its added value is low, and the modification technology mainly adopts high-temperature calcination above 950°C and adding chemical reagents. The requirements for industrial equipment are high, and it is easy to produce secondary gas pollution and water pollution, and the treatment cost is high. , the cost of industrialization is high

Method used

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  • Oyster shell soil remediation agent and preparation method thereof
  • Oyster shell soil remediation agent and preparation method thereof
  • Oyster shell soil remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation of embodiment 1 component A oyster shell powder

[0033] 1.1 Preparation method

[0034] Preparation of Component A: Clean the oyster shells and remove the sediment; put the oyster shells into a high-temperature reactor for subcritical hydrolysis. 60 minutes; release the pressure and discharge; crush the subcritical hydrolyzed material into a powder smaller than 2mm to obtain the component A.

[0035] 1.1.1 Effect of subcritical hydrolysis treatment at different temperatures on the adsorption of heavy metals in oyster shell powder

[0036] Oyster shells treated at different temperatures (at normal temperature and pressure, 200°C 1.5Mpa; 250°C 3.2Mpa; 300°C 4.4Mpa for 1h) were ground and passed through a sieve with a diameter of 2 mm, and the oyster shell powder was weighed and added to the Concentration is respectively in the heavy metal solution of Cd, Pb, Cr, Zn of 1mg / L, the final volume of control solution is 50mL, the addition amount of oyster she...

Embodiment 2

[0067] The preparation of embodiment 2 component B

[0068] 2.1 Preparation method

[0069] Preparation of component B: Mix agricultural cellulose waste and pig manure in proportion to obtain a mixture; put the obtained mixture into a high-temperature reactor for subcritical hydrolysis, and the subcritical hydrolysis conditions are temperature 160°C-200°C, pressure 0.5 -2.0Mpa, the treatment time is 10min-30min; discharge the material by releasing the pressure; dry at 100°C for 2h; pulverize the obtained subcritical hydrolyzate into a powder smaller than 2mm to obtain component B.

[0070] Wherein, sample 1: agricultural cellulose waste: pig manure=20%wt:80%wt; subcritical hydrolysis condition is: 200 ℃, 2.0MPa;

[0071] Sample 2: Agricultural cellulose waste: pig manure=50%wt:50%wt; subcritical hydrolysis conditions are: 200°C, 2.0MPa,

[0072] Measure the nutrient substance content of component B, its result is as shown in table 5, table 6:

[0073] Table 5 Determination ...

Embodiment 3

[0084] Embodiment 3 oyster shell soil remediation agent 1

[0085] (1) Preparation of component A: clean the oyster shells and remove the sediment; put the oyster shells into a high-temperature reactor for subcritical hydrolysis, the subcritical hydrolysis conditions are temperature 220°C, pressure 2.6Mpa, and treatment time is 30min; depressurization Discharging: The component A is obtained by pulverizing the subcritical hydrolyzed material into a powder smaller than 2 mm.

[0086] (2) Preparation of component B: Mix agricultural cellulose waste and pig manure in proportion to obtain a mixture; put the obtained mixture into a high-temperature reactor for subcritical hydrolysis, and the subcritical hydrolysis conditions are temperature 200°C and pressure 2.0Mpa , the treatment time is 20min; the material is discharged under pressure release; drying at 100°C for 2h; the obtained subcritical hydrolyzate is pulverized into a powder smaller than 2mm to obtain component B;

[0087...

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Abstract

The invention discloses an oyster-shell soil remediation agent. The oyster-shell soil remediation agent comprises a component A and a component B, wherein the component A is oyster shell powder; the component B is a mixture of agricultural fiber waste and pig manure; and the ratio of the component A to the component B is (15-30 wt%): (70-85wt%), preferably (20-40 wt%): (60-80 wt%). The oyster-shell soil remediation agent provided by the invention has an organic matter content of no less than 90%, a total nitrogen-phosphorus-potassium content of no less than 8%, a calcium content of no less than 6%, and a heavy metal Cd, Pb and Cr removal rate of no less than 85%. The invention also discloses a method for preparing the above-mentioned soil remediation agent. The invention has the followingadvantages: raw materials are widely available; the process is simple; complex reaction equipment is not needed; and agricultural value and social value are significant.

Description

technical field [0001] The invention belongs to the technical field of biological environmental protection, and in particular relates to an oyster shell soil restoration agent and a preparation method thereof. Background technique [0002] The soil in many areas of our country is seriously polluted by heavy metals. The content of heavy metals in the soil and rivers exceeds the Class III standard, and the polluted area is expanding and the degree of pollution is still intensifying. The bioavailability is high, and there is a great potential harm to the surrounding ecosystem. According to the National Soil Pollution Survey Bulletin released by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the total excessive rate of heavy metals in soil in the country is 16.1%, of which the proportions of slightly, lightly, moderately and heavily polluted sites are 11.2% and 2.3% respectively. , 1.5% and 1.1%. Inorganic pollution is the main type of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/80C09K17/40C09K101/00
CPCC05F3/00C09K17/06C09K2101/00C05G3/80C05F5/00C05F11/00
Inventor 康永松高秋芬林开发
Owner 厦门康浩生态农业有限公司
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