Sulfate-reducing bacteria for bioremediation of heavy metal-polluted agricultural soils

Overview

Heavy metal contamination of agricultural soils poses a significant threat to food security, environmental health, and human wellbeing. This research proposes a bioremediation approach using sulfate-reducing bacteria (SRB) to remediate heavy metal-polluted soils, with a focus on rice cultivation. The project investigates how SRB inoculation can detoxify heavy metals, improve nutrient cycling, enhance rhizospheric microbial activity, and restore soil enzymatic functions. By leveraging naturally occurring biological materials, this approach offers an environmentally friendly alternative to conventional remediation methods, enabling safe reuse of contaminated land for crop production.

Technical specifications

Research approach:

• Isolation and molecular identification of sulfate-reducing bacteria (SRB) strains
• Screening for heavy metal resistance patterns to identify tolerant SRB species
• Evaluation of SRB inoculation efficacy for metal detoxification and interaction with essential nutrients, particularly phosphorus
• Assessment of metal speciation, decontamination, and redistribution in polluted soils
• Field evaluation of SRB inoculation impact on rice yield grown in heavy metal-contaminated soil

Key applications:

• Remediation of heavy metal-polluted agricultural soils
• Restoration of soil microbial communities and enzymatic activity
• Improvement of nutrient cycling in contaminated environments
• Safe reuse of contaminated farmland for crop cultivation

Technology readiness level

This research is at an early-to-mid stage of development. The project involves laboratory isolation and screening of SRB strains, followed by evaluation of their remediation efficacy in soil and eventual field validation in rice cultivation. Future validation plans include disseminating findings to the farming community to build awareness and capabilities for soil remediation. The approach requires further development and field testing before commercial deployment.