Environment-friendly and in situ immobilized method of renovating heavy metal contaminated soil with humic acid substance
US10456817B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 5, 2019 |
| Grant date | Oct 29, 2019 |
| Priority date | — |
| Expiry date | Mar 5, 2039 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB09C2101/00
- WIPO fieldEnvironmental technology
- WIPO sectorChemistry
Abstract
Providing a environment-friendly and in situ immobilized method of renovating heavy metal contaminated soil with humic acid substance, comprising: while the heavy metal contaminated soil being pulverized, adding humic acid substance into the soil according to weight ratio 5-20:1 of the humic acid substance to the total heavy metals contained in the soil, then aging the soil for more than 24 hours after the pulverization process; 2) adding 1-3 parts by weight of semi-coke bacterial fertilizer to 100 parts by weight of the water-stable granular structures, and mixing uniformly. The provided method for renovating heavy metal contaminated soil is reasonable with simple and safe operation and a low production cost, the method can be used for performing in-situ reduction, complexation and solidification, permanently encapsulating and blocking the heavy metals, eradicating secondary pollution and rebound of the treated pollutants, improving the natural environment with rapid renovation and desirable effect, the restored soil can normally grow trees and flowers and plant a variety of crops, the treatment cost is low, and the method may be applied in a wide range and produce improved econom…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.