Modified biomass charcoal and method for preventing heavy metal from being accumulated in vegetable bodies

A technology of biomass carbon and heavy metals, which is applied in the fields of botanical equipment and methods, plant cultivation, carbon preparation/purification, etc., to achieve the effect of ensuring safety, environmental friendliness, and improving quality

Inactive Publication Date: 2017-06-13
HOHAI UNIV
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Problems solved by technology

[0005] Although more and more researches and patents have begun to pay attention to the remediation ability of HAP and biochar to soil heavy metal pollution, few people have studied the remediation ability of heavy metals in soil after the optimal combination of the two materials and the reduction of heavy metal accumulation in vegetables, and the improvement of Vegetable Quality Ability

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  • Modified biomass charcoal and method for preventing heavy metal from being accumulated in vegetable bodies
  • Modified biomass charcoal and method for preventing heavy metal from being accumulated in vegetable bodies
  • Modified biomass charcoal and method for preventing heavy metal from being accumulated in vegetable bodies

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Embodiment Construction

[0027] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0028] Biomass charcoal raw material is corn stalks, prepared in Liyang Desheng Activated Carbon Factory, pyrolyzed at 350-500°C for 4-6h under anaerobic conditions, cooled naturally and then ground for use. Pass through a 100-mesh sieve (particle size less than 0.15mm) before use. The basic physical and chemical properties of biochar are: pH=10.45, the organic carbon content is 500.67g / kg, the mass fractions of C, H, and O elements in biochar are 64.77%, 1.05% and 15.9%, respectively, and the total cadmium content is low after testing on the detection line.

[0029] Hydroxyapatite was purchased from Nanjing Epurui Co., Ltd., micron-sized, spherical, with a particle size of <12 μm.

[0030] The contaminated soil was collected from Anhui, which is cadmium-contaminated red soil, and the sampling layer is the surface layer 0-20cm. The soi...

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Abstract

The invention discloses modified biomass charcoal and a method for preventing heavy metal from being accumulated in vegetable bodies. Natural mineral modified biomass charcoal with the pH value being 7 to 8 is prepared through a dissolving-oscillating-ultrasound-pyrolysis process, wherein the mass ratio of hydroxyapatite to the biomass charcoal is 0.5-5:1. On medium-degree and low-degree heavy metal polluted soil, the modified biomass charcoal is applied to rhizosphere soil according to a certain mass fraction after vegetables grow for a period of time, enrichment of heavy metal of the edible part of the vegetables can be effectively reduced, and the content of N and P in blades is increased. The modified biomass charcoal is environment-friendly, low in cost, free of secondary pollution, high in operability and capable of reducing accumulation of heavy metal in plant bodies and improving soil and vegetable quality at the same time.

Description

technical field [0001] The invention relates to a modified biomass charcoal, in particular to a modified biomass charcoal and a method for preventing and controlling the accumulation of heavy metals in vegetables. Background technique [0002] The 2014 "National Soil Pollution Survey Bulletin" shows that the total excess points of soil pollution in my country are 16.1%, among which the point excess rate of cultivated soil is as high as 19.4%, and the main pollutant types are cadmium (Cd), nickel (Ni ), copper (Cu), arsenic (As), mercury (Hg), lead (Pb), etc. In recent years, due to the long-term impact of sewage irrigation, sludge and the application of heavy metal-containing pesticides and fertilizers, vegetable soil has become a soil type that accepts more types and quantities of heavy metal pollutants in cultivated land. When testing the heavy metal content in scattered vegetable field soil and vegetables in the suburbs of Nanjing, it was found that the content of Cd, Zn,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/00A01G1/00C01B32/05
CPCB09C1/08A01G22/00B09C1/00C01P2004/03C01P2004/61
Inventor 汪宜敏徐兰袁旭音刘情唐豆豆张晓辉
Owner HOHAI UNIV
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