A method for humification product used in mine heavy metal washout pollution control

A pollution control and humification technology, applied in the restoration of polluted soil and the treatment of biological organic parts, can solve the problems of limited passivation effect of heavy metals, secondary pollution, complicated phytoremediation process, etc. Leaching pollution, reducing carbon emissions, and achieving harmless effects

Active Publication Date: 2022-08-09
TONGJI UNIV
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Problems solved by technology

However, the passivation effect of general soil amendments on heavy metals is limited, and can only play a temporary inhibitory role, and bioaccumulation will occur if the time is too long
However, the process of phytoremediation is more complicated. In the process of extracting heavy metals, it is necessary to change the heavy metals into soluble and free states and then collect them by leaching. This process will also cause secondary pollution.

Method used

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  • A method for humification product used in mine heavy metal washout pollution control
  • A method for humification product used in mine heavy metal washout pollution control
  • A method for humification product used in mine heavy metal washout pollution control

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Embodiment 1

[0033] 1. Generate polar humic groups

[0034] Using ultra-high temperature aerobic fermentation, the sludge and extreme thermophilic bacteria (Thermus sp.) were mixed and fermented. The initial moisture content was controlled at 53.7%, and the organic matter content was 62.4%; the maximum fermentation temperature reached 83.2 °C, and the fermentation time was 14 days. , and then add 20wt% biochar for secondary fermentation, the fermentation time is 7d, the time of maintaining ≥75°C is 9d, and the total fermentation time is 21d, figure 1 changes in fermentation temperature.

[0035] 2. Determination of the content of polar functional groups in humification products

[0036] The humus content of the sludge before fermentation (characterized by humic carbon content) is 64.7 mg / g VS, and the humus content of the decomposing material in step 1 (characterized by humic carbon content) is 147.6 mg / g VS, which meets the requirements of sludge humus content ; The humus content of the...

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Abstract

The invention discloses a method for controlling the pollution of heavy metal washing in mines by humification products, comprising the following steps: (1) mixing and fermenting sludge with extreme thermophilic bacteria to induce polar humification groups; The fermented material is mixed with the original material of humus precursors for fermentation to induce mass production of humus until the humus content reaches the standard requirements; (2) The sludge humification products that meet the standard are mixed with heavy metal-contaminated mine soil for conservation , to repair polluted mines. The method absorbs and enriches the heavy metals polluted on the mine surface by using the humification products, and can increase the complexation of copper, cadmium, chromium, lead, nickel, arsenic and zinc by 20-85%, and has significant absorption and enrichment of heavy metals. After the humification product is enriched with heavy metals, the heavy metals are induced to migrate on the primary minerals of the mine and mineralized to produce secondary minerals, so that the free heavy metals are fixed on the primary minerals, thereby effectively solving the washout pollution of heavy metals in the mine.

Description

technical field [0001] The invention belongs to the technical field of organic solid waste treatment and resource utilization, and in particular relates to a method for controlling the pollution of heavy metal washing in mines by a humification product. Background technique [0002] Heavy metal resources in mines are rich and varied, with the characteristics of wide distribution and large reserves. Mining has brought abundant resources and benefits to human beings, but large-scale mining activities have also caused serious damage to the environment. After mining, exposed mines, waste rock dumps, subsidence areas and other industrial and mining areas containing high concentrations of heavy metals, after long-term natural oxidation, rain erosion, and weathering of solid mine waste, heavy metals in mines will enter the environment in various chemical forms. Or ecosystems, and heavy metals are not biodegradable, so they will migrate and gradually accumulate in the environment o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/10
CPCB09C1/10Y02W30/40C02F2103/10C02F2101/20C02F11/02C02F3/341C02F2209/02
Inventor 董滨李昕沈丹妮徐祖信
Owner TONGJI UNIV
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