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Water and soil comprehensive treatment method for polluted drainage basin

A comprehensive treatment and watershed technology, applied in the field of environmental treatment, can solve problems such as stability needs to be improved, achieve the effect of effectively removing heavy metal ions and organic matter, improving reliability and durability, and removing nitrogen and phosphorus

Active Publication Date: 2022-05-06
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biochar nano-zero-valent iron-nickel composite thus obtained is a surface-supported composite, and its stability needs to be improved.

Method used

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  • Water and soil comprehensive treatment method for polluted drainage basin
  • Water and soil comprehensive treatment method for polluted drainage basin
  • Water and soil comprehensive treatment method for polluted drainage basin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Example 1

[0069] Ramie was planted in red soil for 130 days, and 200mg / L citric acid aqueous solution was sprayed every week. After 130 days, the hemp stalks are cut. Wash with deionized water, soak in 0.01M dilute hydrochloric acid for 1 hour, dry and pulverize into 2mm particles at 70.0°C. In a tubular muffle furnace, the pulverized particles were pyrolyzed at 700 °C for 100 minutes to prepare a bulk-loaded zero-valent iron biochar material.

[0070] XRD peaks at 44.8°, 65.1°, 82.2° (zero-valent iron) and 43.1°, 50.4°, 73.9° (iron carbon compound CFe 15.1 )Diffraction peaks.

[0071] The TEM of the bulk-loaded zero-valent iron biochar material revealed that the zero-valent iron particles were dispersedly embedded in the biochar bulk phase.

[0072] The XPS of the bulk-loaded zero-valent iron biochar material revealed that the zero-valent iron content at the surface, at the depth of 40nm and at the depth of 80nm were 1.41%, 9.02% and 18.35, respectively.

[0073...

Embodiment 2

[0076] Ramie was planted in red soil for 150 days, and 100mg / L citric acid aqueous solution was sprayed every week. Harvest hemp stalks after 150 days, dry them in the sun, and crush them for later use.

[0077] Dewater municipal sludge to about 60% water content, add 1wt% ferrous sulfate, age for 7 days, then add ramie powder at a volume ratio of 1:1, make 2mm particles, dry, and put in a tubular muffle furnace , pyrolyze the pulverized particles at a temperature of 750 degrees Celsius for 150 minutes to obtain composite particles of zero-valent iron biochar and sludge biochar loaded in the bulk phase.

Embodiment 3

[0079] Ramie was planted in red soil for 130 days, and 200mg / L citric acid aqueous solution was sprayed every week. After 130 days, cut the hemp stalks, dry them in the sun, and crush them for later use.

[0080] Dewater the municipal sludge to a water content of about 60%, add 1wt% ferrous sulfate, age for 7 days, then add ramie powder at a volume ratio of 1:1, add bentonite at a volume ratio of 1:0.15, and mix well to make 2mm particles were dried, and the pulverized particles were pyrolyzed at 800 degrees Celsius for 120 minutes in a tubular muffle furnace to obtain composite particles of bulk-loaded zero-valent iron biochar and sludge biochar.

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Abstract

The invention discloses a polluted drainage basin water and soil comprehensive treatment method, which comprises the following steps: planting suitable crop plants in red soil, absorbing iron components in the red soil through the crop plants, crushing the crop plants, mixing the crushed crop plants with sludge, granulating, and carrying out anaerobic pyrolysis at a suitable temperature to obtain bulk phase loaded zero-valent iron biochar and sludge biochar composite particles; a good effect is achieved on water and soil comprehensive treatment of the polluted drainage basin.

Description

technical field [0001] The invention relates to the field of environmental management, in particular to a method for comprehensive management of water and soil in polluted river basins. Background technique [0002] So far, environmental pollution, such as water pollution and soil pollution, has received global attention. The researchers found that the use of zero-valent metals such as magnesium, copper, and iron has great advantages in the removal of underground refractory organic pollutants. Compared with other zero-valent metals, the preparation process of zero-valent iron is simple, the reaction is complete and does not cause secondary pollution to the environment, and because it is cheap and easy to obtain, it has received extensive attention in engineering applications. [0003] Among them, nano-zero-valent iron has been widely used as an efficient repair material because of its large specific surface area and surface energy, which can cause special surface effects an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/70B09C1/00B09C1/08
CPCC02F1/283C02F1/705B09C1/002B09C1/08B09C2101/00
Inventor 常明王雷廖海清许伟宁张秋英王瑾雅丹纪美辰梁旭李一葳
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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