Synergistic Remediation: Unveiling the Potential of Biochar-Bacteria Coupled Systems in Heavy Metal Adsorption

The escalating concern over heavy metal pollution in China necessitates innovative solutions for effective remediation. This study explores the promising synergy between biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing…

March 9, 2024

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Zhu, Wang, et al (2024) Loading organic phosphorus-degrading bacteria enhanced biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More performance for heavy metals adsorption. *Environmental Technology Innovation*. https://doi.org/10.1016/j.eti.2024.103585

The escalating concern over heavy metal pollution in China necessitates innovative solutions for effective remediation. This study explores the promising synergy between biochar and organic phosphorus-degrading bacteria (OPB3–6–1) for heavy metal adsorption, utilizing walnut green husk biochar as the carrier.

Loaded with OPB3–6–1, biochar (IOPB) demonstrated a remarkable synergistic effect in adsorbing Pb2+, Cu2+, and Cd2+. Notably, IOPB500, prepared at 500℃ pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More temperature, exhibited the highest adsorption capacities, reaching 591.0, 300.0, and 20.0 mg/g for Pb2+, Cu2+, and Cd2+, respectively. Various factors such as carrier dosage, reaction temperature, and pHpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More were found to influence IOPB500’s adsorption efficiency.

Detailed analysis revealed that the dominant role in the bacteria-biochar coupled system was played by OPB3–6–1. The carrier, IOPB500, showcased monolayer chemical reactions dominating the adsorption process, while intra-particle diffusion played a significant role in rate control. Extracellular complexation by OPB3–6–1 facilitated heavy metal adsorption in IOPB, as evidenced by the detection of specific functional groups in the carrier via FTIR.

Application of IOPB500 in heavy metal-contaminated soil resulted in a decrease in the exchangeable fraction of Pb2+, Cu2+, and Cd2+, thereby mitigating toxicity and risks. The exchangeable fraction decreased by 15.7%, 19.0%, and 23.24%, respectively, while the residual content increased, indicating a potential for soil remediation.

This study establishes the potential of biochar-bacteria coupled systems for heavy metal remediation, shedding light on their synergistic effects in adsorption. The findings contribute valuable insights into the development of microbial technologies for efficient and sustainable heavy metal remediation in the environment.