Chromium Removal with Environmentally Friendly Iron Nanoparticles in a Pilot Scale Study

Area of Science:

• Environmental Science
• Nanotechnology
• Water Treatment

Background:

• Nano zero valent iron (nZVI) is a highly reactive material for in situ remediation of contaminated aquifers.
• nZVI injection is a viable method for pollutant reduction and immobilization in groundwater.
• Green synthesis offers a sustainable route for producing effective nanomaterials.

Purpose of the Study:

• To evaluate the efficiency of green synthesized iron nanoparticles (GT-nZVI) for Cr(VI) removal.
• To assess the performance of GT-nZVI in a pilot-scale application for contaminated aquifer remediation.

Main Methods:

• Construction of a pilot-scale tank (2.5m x 3.75m x 1.5m) filled with 24 tons of soil.
• Injection of 3 m³ GT-nZVI suspension into the soil.
• Introduction of contaminated water (5 mg/L Cr(VI)) and monitoring of parameters (pH, redox, conductivity, Fe, Cr(VI)) over one year.

Main Results:

• The pilot-scale reactive zone demonstrated efficient Cr(VI) removal.
• The system operated effectively for a duration of one year.
• Analysis confirmed the reduction of Cr(VI) and presence of iron.

Conclusions:

• Green synthesized iron nanoparticles (GT-nZVI) are effective for in situ Cr(VI) remediation.
• The pilot study confirms the long-term efficiency of GT-nZVI in treating contaminated water.
• This nanotechnology approach shows significant potential for sustainable aquifer cleanup.