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Granulated heavy metal contaminated soil passivation conditioning agent, and application thereof

A technology for contaminated soil and heavy metals, applied in the restoration of contaminated soil, soil conditioning materials, applications, etc., can solve the problems of uncontrollable repair time, poor repair effect, long repair time, etc., to increase porosity and water retention capacity , Improve the performance of water retention and fertilizer retention, and the effect of high adsorption activity

Inactive Publication Date: 2017-02-22
李娟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent documents CN 102101123 A and CN102303041 A respectively disclose a method for in-situ remediation of heavy metal-contaminated soil and a method for in-situ immobilization of compound-type heavy metal-contaminated soil, which have high cost, long repair time, uncontrollable repair time and poor repair effect. good question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation example of granular heavy metal polluted soil passivation conditioner is as follows:

[0036] 1) The components of Part A are calculated in parts by weight, organic matter: starter: microbial agent = 80:5:15, mix evenly, spray water to make the water content of the mixture about 25%, and compost at room temperature for 120 hours to form semi- The decomposed organic matter is granulated in a drum granulator to obtain granules with a particle diameter of about 3 mm, and dried for later use.

[0037] 2) Activated red mud: in parts by weight, red mud 70%, organic matter 25%, magnesium chloride 5%, hydrochloric acid 5.0 mol / L, water. Mix red mud and magnesium chloride, add 40% of the total weight of water, mix well, add hydrochloric acid, mix well, react at room temperature for 5 hours, separate solid and liquid, add water twice, stir well, and carry out solid-liquid separation after standing still. Separate, dry the obtained solid at 120°C, grind and pass t...

Embodiment 2

[0042] The preparation example of granular heavy metal polluted soil passivation conditioner is as follows:

[0043] The components of part A are calculated in parts by weight, organic matter: starter: microbial agent = 75: 10: 15, mix evenly, spray water to make the moisture content of the mixed material about 28%, and compost at room temperature for 72 hours to form semi-decomposed organic matter , granulated in a disc granulator, the average particle diameter of the obtained granules was 6mm, and dried for later use.

[0044]1) Preparation of activated red mud: by weight, 75% of red mud, 19% of organic matter, 6% of magnesium chloride, 6.0mol / L hydrochloric acid, and water. Mix red mud and magnesium chloride, add 40% of the total weight of water, mix well, add hydrochloric acid, mix well, react at room temperature for 6 hours, separate solid and liquid, add water twice, stir evenly, and carry out solid-liquid separation after standing still. Separate, dry the obtained soli...

Embodiment 3

[0050] The initial concentration of cadmium in the soil of a rice demonstration field in a certain township is 0.37 mg / kg. Take 5 kg of the soil and crush it until the particle size is less than 2 cm. Pack into a 20L plastic container, add a small amount of water to moisten the soil, add 5g of the conditioning agent described in Example 1, stir well, leave standstill for 3 days and then get a 10g soil sample for inspection.

[0051] After testing, the leaching concentration of cadmium in the soil sample was 95%.

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Abstract

The invention discloses a heavy metal contaminated soil passivation conditioning agent, and an application thereof. The conditioning agent comprises a part A, a part B and a part C. The part A comprises organic matter, a fermentation agent, and a microbial agent. The part B comprises fly ash, humate, biomass carbon, a phosphorus-containing fertilizer, and granular activated red mud. The part C comprises bentonite and iron powder. The weight ratio of the part A to the part B to the part C is (20-30) to (20-40) to (40-60). When the conditioning agent provided by the invention is used in heavy metal contaminated soil treatment, the cost is low, the dose is low, reparation time is short, operation is simple, implementation is easy, and the application range is wide. The influence on soil original pH value is low, the reparation efficiency is high, and the reparation effect is stable. The conditioning agent has a passivation effect upon heavy metals, and performs bidirectional conditioning upon soil pH value. The conditioning agent is suitable for agricultural mechanized operation, and has a sustained-release function.

Description

technical field [0001] The invention relates to the field of heavy metal polluted soil treatment, in particular to a granulated heavy metal polluted soil passivation conditioner and application thereof. Background technique [0002] The main sources of heavy metal pollution in soil are industrial waste gas, waste residue, diffusion, sedimentation and accumulation of heavy metals in wastewater, sewage irrigation, sludge fertilization, and long-term large-scale application of heavy metal-containing agricultural materials. The high content of heavy metals in the soil seriously affects the growth and quality of crops, and is absorbed into rice through plants, and then enters the human body through the food chain, and accumulates in the human body, causing various diseases and seriously endangering human health. [0003] Patent documents CN 102101123 A and CN102303041 A respectively disclose a method for in-situ remediation of heavy metal-contaminated soil and a method for in-sit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K109/00C09K101/00
CPCB09C1/08C09K17/40C09K2101/00C09K2109/00
Inventor 李娟
Owner 李娟
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