Composite soil conditioner for treating Cd pollution, and preparation and use methods thereof

A soil conditioner and formula technology, which is applied in the environmental field to achieve the effects of simple application and promotion, high-efficiency physical and chemical properties, and improvement of soil physical and chemical properties

Inactive Publication Date: 2016-06-15
HUNAN MEIXINLONG ECOLOGICAL ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron-reducing bacteria agents are very suitable for soil remediation because of their simple preparation method and their anaerobic metabolism ability, which does not require additional aeration facili

Method used

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  • Composite soil conditioner for treating Cd pollution, and preparation and use methods thereof
  • Composite soil conditioner for treating Cd pollution, and preparation and use methods thereof
  • Composite soil conditioner for treating Cd pollution, and preparation and use methods thereof

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preparation example Construction

[0034] A method for preparing a composite soil conditioner for treating heavy metal Cd pollution, comprising the following steps: fully stirring clay minerals, peat, biochar, slaked lime and iron oxide until uniformly mixed; adding microbial bacterial agents by 5-10% , made of inorganic-organic composite conditioner.

[0035] The clay minerals are mainly kaolinite, montmorillonite and illite, which are crushed and passed through a 40-mesh sieve for later use. The kaolin mentioned above should meet the requirements of GB / T14563-2008, and the montmorillonite and illite should meet the requirements of GB / T14563-2008.

[0036] The organic matter content in the peat is mostly 40-70%, and the pH value is 6.0-7.0, which is pulverized by a pulverizer and passed through a 40-mesh sieve for later use.

[0037] The slaked lime is a strong alkaline substance produced by limestone through processes such as calcination, digestion, separation and deslagging, and centrifugal dehydration. The...

Embodiment 1

[0045] Embodiment 1: The preparation of the compound soil conditioner that is used to control heavy metal Cd pollution

[0046] Clay minerals, peat, biochar, humic acid and slaked lime are pulverized by a pulverizer, sieved with 40 meshes, fully stirred until mixed evenly, and microbial bacterial agents are added in a proportion of 5%. Among them, the addition ratio of clay minerals, peat, biochar, slaked lime and iron oxide is 25:15:15:30:10.

[0047] The clay minerals are mainly kaolinite, which is crushed and passed through a 40-mesh sieve for later use. The kaolinite should meet the requirements of GB / T14563-2008.

[0048] The peat has an organic matter content of 60% and a pH value of 7.0, which is pulverized by a pulverizer and passed through a 40-mesh sieve for later use.

[0049] The slaked lime is a strong alkaline substance produced by limestone through processes such as calcination, digestion, separation and deslagging, and centrifugal dehydration. The main compon...

Embodiment 2

[0051] Embodiment 2: be used for the preparation of the compound soil conditioner of controlling heavy metal Cd pollution

[0052] Clay minerals, peat, biochar, humic acid and slaked lime are pulverized by a pulverizer, sieved with 40 meshes, fully stirred until mixed evenly, and microbial bacterial agents are added in a proportion of 5%. Among them, the addition ratios of clay minerals, peat, biochar, slaked lime and iron oxides are 20:15:15:35:5, respectively.

[0053] Clay minerals are selected from montmorillonite, crushed and sieved with 40 meshes for later use. The montmorillonite meets the requirements of GB / T14563-2008.

[0054] The organic matter content in the peat is 50%, the pH value is 6.5, it is pulverized by a pulverizer and passed through a 40-mesh sieve for later use.

[0055] The slaked lime is a strong alkaline substance produced by limestone through processes such as calcination, digestion, separation and deslagging, and centrifugal dehydration. The main ...

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Abstract

The invention discloses a composite soil conditioner for treating heavy metal Cd pollution, and preparation and use methods thereof. The composite soil conditioner comprises the composition and content: 20-30% of clay minerals, 10-20% of peat, 10-20% of biochar, 25-35% of slaked lime, 5-15% of an oxide of iron, and 5-10% of a microbial agent. The preparation of the composite soil conditioner comprises the following steps: adding the clay minerals, the peat, the biochar, the slaked lime and the oxide of iron in proportion, then fully stirring until the raw materials are evenly mixed; adding the microbial agent with the amount of 5-10%, to prepare an inorganic and organic composite conditioner, wherein the microbial agent contains at least one of iron-reducing bacteria, photosynthetic bacteria and bacillus. The composite soil conditioner prepared by the method is directly added to crop field soil polluted by heavy metals in proportion, and then ploughed fallowing is performed. Compared with the prior art, the product has the advantages of ingenious and reasonable formula design, excellent in-situ passivation effect, simple preparation method, low production cost, simple application method and the like.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to a soil heavy metal conditioner and its preparation and application method, in particular to a composite soil conditioner for controlling heavy metal Cd pollution and its preparation and application method. Background technique [0002] Due to the hidden, long-term, non-degradable and irreversible characteristics of soil heavy metal pollution, it not only leads to the decline of soil fertility, crop yield and crop quality, but also easily causes groundwater pollution, and can spread through food chains and other ways in plants, Accumulates in animals and humans. According to statistics from relevant departments, over 10 million tons of grain are reduced every year due to heavy metal pollution, and as many as 12 million tons of grain are polluted by heavy metals, with a total economic loss of at least 20 billion yuan. [0003] Cd is a non-essential and highly to...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/10C09K109/00
CPCC09K17/40B09C1/10C09K2109/00
Inventor 王继红王跃强余震郭亮
Owner HUNAN MEIXINLONG ECOLOGICAL ENVIRONMENTAL PROTECTION TECH
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