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Heavy-metal contaminated soil compost modifier and modifying method thereof

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil, organic fertilizers, fertilization devices, etc., to achieve the effect of increasing effectiveness, reducing soil bulk density, and facilitating leaching and removal

Active Publication Date: 2017-11-21
四川省天晟源环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the deficiencies of the existing heavy metal-contaminated soil remediation technology, the present invention provides a compost improver for heavy metal-contaminated soil and its improvement method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The compost improver is made by separating 50 kg of cow dung from wet and dry, with a water content of 55%, and mixing it with 20 kg of wood chips passed through a 1 mm sieve, 200 g of microbial agent, 5 kg of straw biochar, and 30 kg of gluconate Iron is fully mixed, and the water content of the above mixture is adjusted to 50%~60% with tap water, and it is stacked in a well-ventilated place to start aerobic composting; the composting process goes through four stages: heating stage, high temperature stage, cooling stage, and decomposing stage. After 48 days, the compost improver was completed; the following examples all used this compost improver; the pH of the compost improver was 3.87, and the mass fraction of Fe was 3.17%.

Embodiment 2

[0022] Compost amendments were used to treat arsenic-contaminated soil in southern Sichuan, hereinafter referred to as soil A.

[0023] The As-contaminated soil was taken from the cultivated soil around a realgar mine in Sichuan, which is yellow soil. After the samples were taken back to the laboratory, they were naturally air-dried, passed through a 1 mm sieve, and mixed well. After testing, the soil pH value was 6.51, and the total soil As content was 128 mg / kg, which exceeded the limit of 30 mg / kg in the "Technical Specifications for Soil Environmental Quality Evaluation (Three Consultation Drafts)".

[0024] The polluted soil is mixed uniformly with the compost improver of Example 1 in proportion, and aged and stabilized for 3 days; the aged and stabilized soil is rinsed with tap water in a water-to-soil mass ratio of 5:1 to reduce the As content in the soil. The resulting eluent is harmlessly disposed of. The specific parameters of the improved process are shown in Table...

Embodiment 3

[0031] Soil A was mixed evenly with the compost improver of Example 1 in proportion, and aged and stabilized for 3 days; the aged and stabilized soil was rinsed with tap water in a water-to-soil mass ratio of 5:1 to reduce the As content in the soil. Alkaline dolomite powder passed through a 1 mm sieve was added to the soil after leaching according to the soil / dolomite mass ratio of 2:1, and the resulting eluent was harmlessly treated. The changes of heavy metals are shown in Table 2.

[0032] Table 2 Trial supply soil improvement process parameters

[0033] deal with

[0034] As shown in Table 2, after adding dolomite powder through a 1mm sieve to the soil after leaching and fully mixing, the pH value of the soil increased significantly, and the pH values ​​of treatment ⑤ and treatment ⑥ rose to 6.74 and 6.93 respectively, which were slightly higher than the pH value of the original soil. There was an increase; the available arsenic content in the soil decreased to...

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Abstract

The invention discloses a heavy-metal contaminated soil compost modifier and a modifying method thereof. The heavy-metal contaminated soil compost modifier comprises, by mass, 40-60 parts of animal wastes, 15-30 parts of sawdust, 0-2 parts of microbial agent, 3-7 parts of straw biochar and 20-40 parts of ferrous gluconate. By application of a bio-compost technique, soil pH value can be decreased and activity of heavy metal of soil can be improved so that heavy metal is easy to wash off, and effective-state heavy metal content in soil is reduced greatly after the soil pH value is increased. Besides, heavy metal adsorption capacity of soil can be improved while proportion of organic bonding state of heavy metal is increased by means of bio-compost; the compost modifier is prepared from raw materials which have wide resources and are cheap and easy to obtain, is prepared within a short time, can be prepared on field and ready to use, and is low in cost; content of heavy metal in soil and content of effective-state heavy metal can be reduced effectively by integrated utilization of iron-containing materials and the bio-compost technique. The modifying method has the advantages of being easy and practical, environmental-friendly and efficient, and low in cost, and is much superior to the conventional modifying methods.

Description

technical field [0001] The invention relates to an improver and an improvement process for heavy metal polluted soil, in particular to a compost improver for heavy metal polluted soil and an improvement method thereof. Background technique [0002] At present, my country is facing serious problems of soil heavy metal pollution. Some areas have serious soil pollution, the quality of cultivated land soil environment is worrying, and industrial sites have frequent soil pollution incidents. Unreasonable discharge of industrial and mining waste gas and wastewater, sewage irrigation, excessive use of chemical fertilizers and pesticides are the main causes of soil pollution or exceeding standards. According to the "National Soil Pollution Survey Bulletin", the heavy metal pollutants in my country's soil are mainly cadmium, nickel, copper, arsenic, mercury, and lead. The proportions of polluted sites were 13.7%, 2.8%, 1.8% and 1.1% respectively. Since the engineering treatment of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/04B09C1/02B09C1/00C05G3/80
CPCB09C1/00B09C1/02C05D9/00C05G3/80C05D9/02C05F3/00C05F11/00C05F11/08
Inventor 杨放李阳廖禄云王承俊毛志强侯文春陈倩熊振秦佳
Owner 四川省天晟源环保股份有限公司
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