Method for remedying chromium contaminated soil through mineralized rubbish and/or compost products

A technology of chromium-contaminated soil and mineralized garbage, which is applied in the restoration of contaminated soil, application, organic fertilizer, etc., to achieve strong promotion potential, wide sources, and the effect of making up for the lack of microbial nutrient sources

Inactive Publication Date: 2018-01-26
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to expand the application range of mineralized garbage and compost products, and to use its rich humus complexation and ability to reduce hexavalent chromium to fix and passivate heavy metals in the soil, so as to realize in-situ repair of chromium-contaminated soil

Method used

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  • Method for remedying chromium contaminated soil through mineralized rubbish and/or compost products
  • Method for remedying chromium contaminated soil through mineralized rubbish and/or compost products
  • Method for remedying chromium contaminated soil through mineralized rubbish and/or compost products

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Experimental program
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Effect test

Embodiment 1

[0036] Organic matter reduction and complexed chromium experiment in the compost product of embodiment 1

[0037] The compost product after primary fermentation was extracted by the method of International Humic Acid Association as the experimental object, and potassium chromate was used as the simulated pollutant. Mix organic matter (50mg / L), potassium chromate (m(hexavalent chromium)=10mg / L), and phosphate buffer solution (50mM, pH=7) in a 100mL sterilized brown anaerobic bottle, and the reaction Bottle pass N 2 30min to remove the oxygen in the solution, followed by static culture. At the same time, an experiment without adding compost products was carried out as a control. The remaining rate of hexavalent chromium (the remaining concentration C and the initial concentration C 0 ratio) see figure 1 , after about 20 days of reaction, the removal rate of hexavalent chromium is about 20%.

Embodiment 2

[0038] Example 2 Organic Matter in Compost Products Promotes Microbial Reduction of Hexavalent Chromium Experiment

[0039] Using Shewanella oneidensis MR-1 as the model bacteria for chromium reduction, the decomposed compost products extracted by the International Humic Acid Association method were used as the experimental object, and potassium chromate was used as the simulated pollutant. Sodium lactate (5mM), bacterial suspension (10 7 cell / L), compost organic matter (50mg / L) and potassium chromate (c (hexavalent chromium) = 2mM) were mixed in a 100mL sterilized brown anaerobic bottle, and the reaction bottle was ventilated with N 2 30min to remove the oxygen in the solution, followed by static culture. At the same time, experiments without adding compost products and microorganisms and only adding microorganisms were carried out as controls. For the remaining rate of hexavalent chromium, see figure 2 . The results showed that compost organic matter can significantly p...

Embodiment 3

[0040] Embodiment 3 composting product remediation chromium-contaminated site

[0041] Collect domestic garbage, screen and remove metal, glass and stones, etc., and compost the remaining waste. The total carbon, total nitrogen organic matter and moisture content of the remaining waste are 303.20g·kg -1 , 12.55g·kg -1 , 52.11% and 57.85%. The composting process lasts 21 days, resulting in a compost product rich in organic matter and nutrients. The element content was determined by an elemental analyzer, and the metal content was determined by microwave digestion-ICP-OES. The results are shown in Table 1.

[0042] Table 1 Elements and heavy metal content of compost products

[0043]

[0044]The chromium-contaminated soil was collected from a chromium-contaminated site in Shijiazhuang. The total chromium content in the soil was 256 mg / kg, and the hexavalent chromium content was 112 mg / kg. Adopt chromium-contaminated soil remediation process of the present invention, compo...

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Abstract

The invention discloses a method for remedying chromium contaminated soil through mineralized rubbish and / or compost products. The method comprises the following steps that (1) the mineralized rubbishand / or compost products are obtained; (2) the mineralized rubbish and / or compost products are applied to the chromium contaminated soil, uniform mixing is carried out, and water is supplemented; and(3) standing stacking is carried out, and by means of the complexing and reducing capacity of organic matter in the mineralized rubbish and / or compost, reducing and fixing of hexavalent chromium are achieved. According to the method, the remediation cost of a contamination field can be greatly reduced, resource utilization of waste can be achieved, the dual effects of high-added-value treatment and resource utilization of organic waste are achieved, and wide application prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a method for remediating chromium-polluted soil by utilizing mineralized garbage and / or compost products. Background technique [0002] my country's domestic waste is rich in organic matter, and landfill and composting of domestic waste is an important way to solve my country's urban domestic waste. Since domestic waste in my country contains a large amount of precursor substances for the synthesis of humus, landfill mineralized waste or compost products contain a large amount of humic acid, nitrogen, phosphorus and other elements, which can improve the physical, chemical and biological characteristics of the soil and have a positive effect on the growth and development of crops. At the same time, it can also have the advantages of sequestering carbon and remediating soil pollution. [0003] As an important strategic metal, chromium is widely used in electrop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10C05F9/04C05G3/04C05G3/80
CPCY02A40/20
Inventor 何小松杨超席北斗檀文炳李丹袁志业李文进
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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