Cadmium-contaminated soil and underground water remediation agent and remediation method thereof for cadmium-contaminated soil and underground water
A technology for remediation of cadmium-contaminated soil and groundwater, applied in the field of soil and groundwater environmental remediation, can solve the problems of slow corrosion and low cadmium removal efficiency, and achieves the effect of enhancing effective adsorption and solving poor effects
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0047] A cadmium-contaminated soil and groundwater remediation agent and a remediation method thereof, comprising the following steps:
[0048] Collect 2kg of urban sludge, adjust the sludge concentration to 10-20g / L with clean water, add 1g / L of glucose and 2g / L of sodium nitrate. The supernatant was replaced every day, and glucose 1g / L and sodium nitrate 2g / L were added. After 14d, the sludge was transferred to an anaerobic incubator, with the ratio of N 2 :H 2 :CO 2 =85%:10%:5% mixed gas, the sludge was cultivated under the conditions of nitrate concentration of 2g / L and 25°C. After six months of cultivation, the sludge and culture solution were separated by centrifugation, and the sludge in the middle of the sludge layer was taken as the inoculum sludge of 1 / 3 thickness for domestication and expansion in the anaerobic reactor. The inoculum concentration of the sludge was 10g / L, add clear water, 20g / L zero-valent iron powder (particle size 0.15mm), 50mg / L glucose, 85mg / ...
Embodiment 2
[0055] A cadmium-contaminated soil and groundwater remediation agent and a remediation method thereof, comprising the following steps:
[0056] The preparation method of the restoration agent is as described in Example 1.
[0057] Prepare 250mL cadmium-contaminated groundwater samples with deoxygenated water in an anaerobic reactor, where Cd 2+ The concentration is 10mg / L, NO 3 - -N concentration is 0, 7, 14, 28, 56mg / L respectively, adjust pH to 7.0, add repair agent containing zero-valent iron and microorganisms (wherein the content of zero-valent iron in the sample is 1g / L, microorganisms in the sample The content in the reactor is 50mg / L), use nitrogen to exhaust the air in the reactor, and then seal it and place it at 25°C for 5d. At 0d, 0.5d, 1d, 2d, 3d, 4d and 5d after the start of the reaction, 5mL water samples were taken from the reactor and filtered through a 0.22μm filter membrane for the determination of Cd 2+ concentration.
[0058] Under different nitrate c...
Embodiment 3
[0060] A cadmium-contaminated soil and groundwater remediation agent and a remediation method thereof, comprising the following steps:
[0061] The preparation method of the restoration agent is as described in Example 1.
[0062] Prepare 250mL cadmium-contaminated groundwater samples with deoxygenated water in an anaerobic reactor, where Cd 2+ The concentration is 10mg / L, NO 3 - -N concentration is 28mg / L, adjust pH to be 5.0, 6.0, 7.0, 8.0 respectively, add restoration agent containing zero-valent iron and microorganism (wherein the content of zero-valent iron in sample is 1g / L, the content of microorganism in sample Content is 50mg / L), use nitrogen to exhaust the air in the reactor, then seal it and place it at 25°C for 5d. At 0d, 0.5d, 1d, 2d, 3d, 4d and 5d after the start of the reaction, 5mL water samples were taken from the reactor and filtered through a 0.22μm membrane to measure Cd 2+ concentration.
[0063] At different pH, the remediation effect of nitrate-medi...
PUM
| Property | Measurement | Unit |
|---|---|---|
| particle diameter | aaaaa | aaaaa |
| particle diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More