Background: Metal contamination of industrial and agricultural soils represents a serious, long-term environmental concern. It can affect ecosystem health, food safety, as well as the health of humans. Conventional methods of remediation are costly and can be detrimental to the environment. The soil biological function will not be returned by those methods.
Objective: This review seeks to assess the contributions of Paenibacillus polymyxa and Pseudomonas spp. in the bioremediation of heavy metal-contaminated soils and their viability for sustainable environmental restoration.
Methods: Data from laboratory, greenhouse, and field studies were scrutinized to elucidate the mechanisms utilized by P. polymyxa in heavy metal detoxification. These encompass biosorption through exopolysaccharides, enzymatic transformation, siderophore-mediated chelation, intracellular sequestration, and biofilm development. The synergistic role of Pseudomonas spp. in phytoremediation employing native plants and microbial consortia was also evaluated.
Results: P. polymyxa was very good at getting rid of heavy metals, especially lead, and it got rid of more than 90% of them when conditions were just right. It also made the soil healthier by adding more organic carbon, microbial biomass, nutrients, and stability to aggregates. Additionally, its characteristics that help plants grow, like fixing nitrogen, making phosphates more soluble, making phytohormones, and fighting off pathogens, improve the results of phytoremediation. Pseudomonas spp. also helped by improving interactions between plants and microbes and helping break down contaminants. 
Conclusion: P. polymyxa and Pseudomonas spp. exhibit significant potential as principal agents in integrated bioremediation strategies. When used together in synthetic consortia, they can greatly improve soil restoration, promote sustainable farming, and help fight climate change.