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Iron-based soil remediation agent and preparation method thereof

A soil remediation agent, iron-based technology, applied in the field of soil remediation, can solve problems such as arsenic pollution that is difficult to repair, and achieve good environmental friendliness, good repair effect, and low cost effects

Active Publication Date: 2020-04-07
HANGZHOU WEISHINUOWEI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the current problem that arsenic pollution in soil is difficult to repair, the present invention proposes an iron-based soil remediation agent and its preparation method, so as to obtain highly efficient arsenic pollution with simple preparation process, low cost, renewable raw materials and good environmental friendliness soil remediation agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 10kg of corn stalk powder, 10kg of pig manure, and 5kg of oxalic acid to 40kg of biogas residue with a water content of 50% and mix evenly to obtain a mixture, then dilute 3kg of Rujin bacteria stock solution by 100 times and evenly sprinkle it on the mixture. Then compacting, stacking, sealing and fermenting for 7 days to obtain odorless biogas residue;

[0034] (2) Add 10kg of ferric chloride and 5kg of calcium nitrate into 60kg of water. After fully dissolving, continue to add 20kg of biochar, then stir rapidly at a speed of 500rpm for 50min, then ultrasonically disperse for 1h, and then dry using a spin flash dryer to obtain Iron-calcium-loaded biochar; the hot air inlet temperature of rotary flash drying is 250°C, the hot air outlet temperature is 100°C, and the air volume is 2000m 3 / h;

[0035] (3) Add 15kg of iron-calcium-loaded biochar, 5kg of polyacrylic acid, and 3kg of manganese dioxide to 40kg of the prepared odorless biogas residue, and then crush...

Embodiment 2

[0037] (1) Add 20kg of soybean straw powder, 20kg of pig manure, and 10kg of oxalic acid to 60kg of biogas residue with a water content of 60% and mix evenly to obtain a mixture, then dilute 6kg of Rujin bacteria stock solution 120 times and evenly sprinkle it on the mixture, Then compact and stack and seal and ferment for 15 days to obtain odorless biogas residue;

[0038] (2) Add 15kg of ferric nitrate and 10kg of calcium chloride into 100kg of water, after fully dissolving, continue to add 30kg of biochar, then stir rapidly at a speed of 600rpm for 30min, then ultrasonically disperse for 1h, and then use a spin flash dryer to dry to obtain Iron-calcium-loaded biochar; the hot air inlet temperature of rotary flash drying is 350°C, the hot air outlet temperature is 150°C, and the air volume is 3000m 3 / h;

[0039] (3) Add 20kg of iron-calcium-loaded biochar, 10kg of polyacrylic acid, and 6kg of manganese dioxide to 50kg of the prepared odorless biogas residue, and then squee...

Embodiment 3

[0041] (1) Add 13kg of rice straw powder, 13kg of pig manure, and 7kg of oxalic acid to 45kg of biogas residue with a water content of 52% and mix evenly to obtain a mixture, then dilute 4kg of Rujin bacteria stock solution by 105 times and evenly sprinkle it on the mixture. Then compacted, stacked, sealed and fermented for 23 days to obtain odorless biogas residue

[0042] (2) Add 12kg of ferric chloride and 7kg of calcium chloride into 90kg of water. After fully dissolving, continue to add 23kg of biochar, then stir rapidly at a speed of 520rpm for 45min, then ultrasonically disperse for 1h, and then use a spin flash dryer to dry. Obtain iron-calcium-loaded biochar; the hot air inlet temperature of spin flash drying is 280°C, the hot air outlet temperature is 120°C, and the air volume is 2200m 3 / h;

[0043] (3) Add 17kg of iron-calcium-loaded biochar, 7kg of polyacrylic acid, and 5kg of manganese dioxide to 43kg of the prepared odorless biogas residue, and then crush it by...

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Abstract

The invention provides an iron-based soil remediation agent and a preparation method thereof. The iron-based soil remediation agent is prepared by uniformly spraying a Rujin bacterium stock solution on a mixture of biogas residues, straw powder and pig manure mixed with oxalic acid, then compacting, stacking, sealing and fermenting to obtain odorless biogas residues, then mixing a ferric salt, a calcium salt and biochar, drying, and then extruding and crushing an obtained product with the odorless biogas residues, polyacrylic acid and manganese dioxide through a screw. The iron-based soil remediation agent provided by the invention has good adsorption performance; in addition, arsenic in the soil can be converted into Fe-As and Ca-As complexes; meanwhile, abundant organic humus is contained, arsenic adsorbed by the arsenic complex and the soil can be converted into effective-state arsenic, the arsenic content in the soil is effectively reduced, the remediation effect on the arsenic-contaminated soil is good, the preparation process is simple, the cost is low, the raw materials are renewable, and the method has the advantages of being good in environment friendliness and the like.

Description

technical field [0001] The invention relates to the technical field of soil restoration, in particular to an iron-based soil restoration agent and a preparation method thereof. Background technique [0002] Arsenic (As) is a S-philic element, which exists in the crust as pyroarsenite or associated with Cu, Pb, Zn and other sulfides. Due to the wide application of As in many industries, a large amount of it remains in the soil through the processes of mining, processing, use, and disposal, resulting in widespread As pollution in soil worldwide. With the development of industry and agriculture and the continuous application of arsenic-containing chemicals, arsenic pollution has become a serious problem worldwide. Arsenic pollution in soil, air and water is also threatening crop production and human health. Therefore, the study of arsenic pollution and remediation technology has important practical significance, and reducing or eliminating arsenic pollution and poisoning is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40
CPCC09K17/40
Inventor 陈庆陈巧和曾军堂何方陈涛
Owner HANGZHOU WEISHINUOWEI TECH
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