Authors: Sandeep Kumar Mishra, Anjana Jain
Abstract: Industrial sludge often contains toxic concentrations of heavy metals such as cadmium, lead, mercury, and chromium, posing significant environmental and public health risks. Conventional remediation techniques are often costly, inefficient, or generate secondary pollutants. In recent years, engineered microbial consortia have emerged as a sustainable and biologically robust solution for the detoxification of heavy metal-laden sludge. These consortia are composed of synergistically interacting microbial strains, each contributing distinct metabolic or binding capabilities that enhance overall detoxification performance. This study explores the role of genetically or selectively assembled microbial communities in metal biotransformation and immobilization processes. The article highlights mechanisms such as biosorption, bioaccumulation, enzymatic transformation, and bioprecipitation as pivotal pathways used by consortia to neutralize toxic metals. Laboratory-scale and pilot-scale applications have demonstrated promising results in reducing metal toxicity, improving sludge quality, and enabling potential reuse. Moreover, the use of multi-omics tools has refined the selection and optimization of functional strains, paving the way for tailor-made bioremediation strategies. This review integrates scientific findings from recent experiments and discusses the challenges, technological limitations, and future potential of engineered microbial consortia in industrial sludge management. Ultimately, such biotechnological interventions hold promise for transforming hazardous sludge into environmentally benign materials.
DOI: https://doi.org/10.5281/zenodo.16869277
