Heavy-metal contaminated soil compost modifier and modifying method thereof
A technology for polluted soil and heavy metals, applied in the restoration of polluted soil, organic fertilizers, fertilization devices, etc., to achieve the effect of increasing effectiveness, reducing soil bulk density, and facilitating leaching and removal
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Examples
Embodiment 1
[0020] The compost improver is made by separating 50 kg of cow dung from wet and dry, with a water content of 55%, and mixing it with 20 kg of wood chips passed through a 1 mm sieve, 200 g of microbial agent, 5 kg of straw biochar, and 30 kg of gluconate Iron is fully mixed, and the water content of the above mixture is adjusted to 50%~60% with tap water, and it is stacked in a well-ventilated place to start aerobic composting; the composting process goes through four stages: heating stage, high temperature stage, cooling stage, and decomposing stage. After 48 days, the compost improver was completed; the following examples all used this compost improver; the pH of the compost improver was 3.87, and the mass fraction of Fe was 3.17%.
Embodiment 2
[0022] Compost amendments were used to treat arsenic-contaminated soil in southern Sichuan, hereinafter referred to as soil A.
[0023] The As-contaminated soil was taken from the cultivated soil around a realgar mine in Sichuan, which is yellow soil. After the samples were taken back to the laboratory, they were naturally air-dried, passed through a 1 mm sieve, and mixed well. After testing, the soil pH value was 6.51, and the total soil As content was 128 mg / kg, which exceeded the limit of 30 mg / kg in the "Technical Specifications for Soil Environmental Quality Evaluation (Three Consultation Drafts)".
[0024] The polluted soil is mixed uniformly with the compost improver of Example 1 in proportion, and aged and stabilized for 3 days; the aged and stabilized soil is rinsed with tap water in a water-to-soil mass ratio of 5:1 to reduce the As content in the soil. The resulting eluent is harmlessly disposed of. The specific parameters of the improved process are shown in Table...
Embodiment 3
[0031] Soil A was mixed evenly with the compost improver of Example 1 in proportion, and aged and stabilized for 3 days; the aged and stabilized soil was rinsed with tap water in a water-to-soil mass ratio of 5:1 to reduce the As content in the soil. Alkaline dolomite powder passed through a 1 mm sieve was added to the soil after leaching according to the soil / dolomite mass ratio of 2:1, and the resulting eluent was harmlessly treated. The changes of heavy metals are shown in Table 2.
[0032] Table 2 Trial supply soil improvement process parameters
[0033] deal with
[0034] As shown in Table 2, after adding dolomite powder through a 1mm sieve to the soil after leaching and fully mixing, the pH value of the soil increased significantly, and the pH values of treatment ⑤ and treatment ⑥ rose to 6.74 and 6.93 respectively, which were slightly higher than the pH value of the original soil. There was an increase; the available arsenic content in the soil decreased to...
PUM
Login to view more Abstract
Description
Claims
Application Information
Login to view more - R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap