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Composite soil passivator and preparation method thereof

A passivating agent and composite technology, which is applied in chemical instruments and methods, soil conditioning materials, fertilizer mixtures, etc., can solve the problem of difficulty in guaranteeing the long-term effectiveness of passivating agents, and achieves improved practicability and work effect, and increased fertility. degree, the effect of improving the structure

Pending Publication Date: 2022-07-29
核工业西南勘察设计研究院有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The core of in-situ chemical passivation restoration is the selection of passivation agent. It is particularly important to select the appropriate passivation agent for different soil types and pollutant types. Currently, there are a large number of passivation agents that can achieve the passivation restoration of soil contaminated by heavy metal mercury. , but the long-term effectiveness of the passivator is difficult to guarantee

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  • Composite soil passivator and preparation method thereof

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preparation example Construction

[0034] The present invention also provides a preparation method of the composite soil passivating agent, comprising the following steps:

[0035] (1) take respectively the blast furnace slag, biological matrix, sepiolite of weight portion and pulverize to particle diameter less than 50 μm for subsequent use;

[0036] (2) Add the crushed raw materials and sodium metasilicate pentahydrate into water, stir at 1000-5000rpm for 20-60min, then add microbial inoculants and nutrients, and stir at 1000-5000rpm for 20-60min;

[0037] (3) adding a pH adjusting agent to the uniformly mixed raw materials, and adjusting the pH to 7.2-7.6 to obtain the preparation.

Embodiment 1

[0040] The present embodiment provides a composite soil passivating agent, comprising the following components in parts by weight:

[0041] 100 parts of water, 8 parts of blast furnace slag, 4 parts of microbial inoculants (including 1 part of Aspergillus niger, Pseudomonas nitrogen-producing bacteria, 2 parts of biomass charcoal-based inoculants), 20 parts of biological substrate, 5 parts of nutrients, sea foam 6 parts of stone, 15 parts of sodium metasilicate pentahydrate and 10 parts of pH adjuster;

[0042] The nutrients include: 50 parts of peptone, 40 parts of agar, 10 parts of brown sugar and 5 parts of chitosan.

[0043] Also provided is a preparation method of the composite soil passivating agent, comprising the following steps:

[0044] (1) Pulverize the dried straws into particles with a diameter of 1 mm, pyrolyze them anaerobic for 1 hour at 300°C, pulverize again, and pass through a 200-mesh sieve to obtain a biological matrix;

[0045] (2) the quicklime of 10g an...

Embodiment 2

[0050] The present embodiment provides a composite soil passivating agent, comprising the following components in parts by weight:

[0051] 90 parts of water, 5 parts of blast furnace slag, 2.5 parts of microbial inoculum, 15 parts of biological matrix, 3 parts of nutrient, 5 parts of sepiolite, 10 parts of sodium metasilicate pentahydrate and 6 parts of pH adjuster;

[0052] The microbial inoculants include: 15 parts of Aspergillus niger, 15 parts of Pseudomonas nitrogen-producing and 60 parts of biomass charcoal-based inoculants;

[0053] The nutrients include: 70 parts of peptone, 40 parts of agar, 10 parts of brown sugar and 8 parts of chitosan.

[0054] Also provided is a preparation method of the composite soil passivating agent, comprising the following steps:

[0055] (1) Pulverize the dried straws into particles with a diameter of 5 mm, pyrolyze them anaerobic for 2 hours at 450°C, pulverize again, and pass through a 100-mesh sieve to obtain a biological matrix;

[...

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Abstract

The invention discloses a composite soil passivator and a preparation method thereof. The composite soil passivator comprises the following components in parts by weight: 80-100 parts of water, 2-8 parts of blast furnace slag, 1-4 parts of a microbial agent, 10-20 parts of a biological matrix, 2-5 parts of a nutritional agent, 4-6 parts of sepiolite, 5-15 parts of sodium metasilicate pentahydrate and 4-10 parts of a pH regulator. The passivator prepared by the invention is an organic-inorganic composite soil passivator, can effectively fix heavy metals in soil and prevent the heavy metals from entering plants, can also improve the soil environment and improve the soil fertility, and has an obvious passivation effect.

Description

technical field [0001] The invention belongs to the technical field of soil heavy metal treatment, and particularly relates to a composite soil passivator and a preparation method thereof. Background technique [0002] Among the chemical treatment technologies for soil heavy metal pollution, passivation remediation technology has received widespread attention due to its simplicity, good effect, economical and practical advantages, and is especially suitable for remediating large areas of moderately and lightly polluted farmland soil. By adding passivation materials to the soil, it undergoes a series of reactions such as precipitation, adsorption, ion exchange, humification and redox with heavy metals, thereby changing the occurrence form of heavy metals and significantly reducing their bioavailability and migration. It can obviously alleviate the toxic effect of heavy metal pollution on plant growth, and greatly reduce the absorption and accumulation of heavy metals by plant...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K101/00C09K109/00
CPCC09K17/40C09K2101/00C09K2109/00Y02W30/40
Inventor 董云岳建国周勇竹文坤田华
Owner 核工业西南勘察设计研究院有限公司
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