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Chemical remediation agent for cadmium pollution in farmland soil

A technology for chemical remediation and cadmium pollution, applied in the field of soil pollution remediation, can solve the problems of unstable remediation effect, different effects, poor effect, etc., balance and improve soil nutrient status, easy application, and achieve the effect of in-situ remediation

Active Publication Date: 2019-03-19
山西大地民基生态环境股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, CN 105131961A discloses a cadmium-contaminated soil improver, which contains components such as agricultural rare earth nitrate, spent catalyst, medical stone, humic acid ore powder, sepiolite, plant ash, kaolin and zeolite. Different soil textures have different underground effects, and the restoration effect is unstable
CN105037036 A discloses a compound slow-release fertilizer for repairing cadmium-contaminated soil, which includes nitrogen, phosphorus and potassium nutrient components and suitable ratio of agricultural rare earth nitrate, catalyst waste agent, polyhydroxyalkanoate, humic acid mineral powder, sea Components such as pumice, plant ash, kaolin and zeolite are mainly used in acidic soils in the south, and the effect is not good on calcareous soils in the north

Method used

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  • Chemical remediation agent for cadmium pollution in farmland soil
  • Chemical remediation agent for cadmium pollution in farmland soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 30kg of humic acid, 20kg of ammonium sulfate, 20kg of potassium dihydrogen phosphate, 10kg of citric acid, which are ground and passed through a 20-mesh sieve, together with 5kg of disodium dihydrogen pyrophosphate, 3kg of rhamnolipid, 2.5kg of sophorolipid, Add 2 kg of sodium dimercaptopropanesulfonate, 2 kg of sodium methoxybenzyl glucosamine dithiocarboxylate, and 5 kg of bentonite into a stirrer and stir evenly to obtain a mixed material.

[0030] Weigh 0.5kg of polyacrylate, dissolve in 100kg of water, and prepare a 0.5% binder aqueous solution.

[0031] Spray the aqueous binder solution on the mixed material, and adjust the water content of the mixed material at 10-15%, extrude and granulate with a double-roll extrusion granulator, after drying, sieve through a sieving machine, and pack to obtain farmland The granule finished product of soil cadmium pollution chemical remediation agent.

Embodiment 2

[0033] Weigh 25 kg of humic acid, 15 kg of ammonium sulfate, 15 kg of potassium dihydrogen phosphate, 15 kg of citric acid, 5 kg of disodium dihydrogen pyrophosphate, 5 kg of rhamnolipid, 5 kg of saponin, and 5 kg of dimercapto 5kg of sodium propanesulfonate and 9kg of bentonite were added together in the mixer and stirred evenly to obtain a mixed material.

[0034] Weigh 1kg of sodium carboxymethyl cellulose, dissolve it in 100kg of water, and prepare a 1% binder aqueous solution.

[0035]Spray the aqueous binder solution on the mixed material, and adjust the water content of the mixed material at 10-15%, extrude and granulate with a double-roll extrusion granulator, after drying, sieve through a sieving machine, and pack to obtain farmland The granule finished product of soil cadmium pollution chemical remediation agent.

Embodiment 3

[0037] Weigh 20kg of humic acid, 10kg of ammonium sulfate, 25kg of potassium dihydrogen phosphate, 12.5kg of citric acid, 10kg of disodium dihydrogen pyrophosphate, 3kg of rhamnolipid, 2kg of sophorolipid, 2kg of saponin, 10kg of sodium dimercaptopropanesulfonate, and 5kg of bentonite were added together in a mixer and stirred evenly to obtain a mixed material.

[0038] Weigh 0.5kg of polyvinyl acetate, dissolve it in 100kg of water, and prepare a 0.5% binder aqueous solution.

[0039] Spray the aqueous binder solution on the mixed material, and adjust the water content of the mixed material at 10-15%, extrude and granulate with a double-roll extrusion granulator, after drying, sieve through a sieving machine, and pack to obtain farmland The granule finished product of soil cadmium pollution chemical remediation agent.

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Abstract

The invention discloses a chemical repairing agent for farmland soil Cd pollution. The chemical repairing agent is prepared from the following raw materials of 10 to 30 parts of humic acid, 10 to 30 parts of ammonium sulfate, 10 to 30 parts of potassium dihydrogen phosphate, 10 to 15 parts of citric acid, 5 to 15 parts of disodium dihydrogen pyrophosphate, 5 to 10 parts of biosurfactant, 5 to 10 parts of Cd chemical antidote and 5 to 10 parts of bentonite in a mixing way. The chemical repairing agent disclosed by the invention can be uniformly applied into soil along with soil tillage, the application amount per mu is 40 kg to 50 kg, and then water can be irrigated after the soil is uniformly raked. Cd in the soil is enabled to form a more stable chelation state of enabling the Cd not easy to absorb and utilize by a plant through activation, chelation and adsorption, the Cd in the soil can be changed from small molecules into big molecules, passivation of the Cd in the soil is realized, the toxicity of the Cd is reduced, and the chemical repairing agent is suitable for Cd pollution chemical repairing of limy farmland soil.

Description

technical field [0001] The invention belongs to the technical field of soil pollution remediation, and relates to a heavy metal pollution remediation agent for farmland soil, in particular to a heavy metal pollution remediation agent for calcareous farmland soil. Background technique [0002] Soil is the basis of agricultural production. However, with the rapid development of the national economy, pollutants containing heavy metals enter the soil through various channels, gradually forming soil heavy metal pollution. Soil heavy metal pollution has attracted worldwide attention because of its concealment, long-term and irreversible nature. It not only degrades soil fertility, reduces crop yield and quality, but also causes pollution of agricultural products and water resources, and endangers human life through the food chain. and healthy. [0003] The treatment methods of heavy metal pollution in farmland mainly include physical treatment, biological treatment and chemical t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40C05G3/04B09C1/08C09K101/00C05G3/80
CPCB09C1/08C05G3/80C09K17/40C09K2101/00
Inventor 张能虎张强郜春花霍成祥王继宇刘捷孙晶
Owner 山西大地民基生态环境股份有限公司
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