Korea Biochar Research Center, APRU Sustainable Waste Management Program & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea; University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstrasse 7, 42285 Wuppertal, Germany; Soils and Plant Nutrition Division, Coconut Research Institute, Lunuwila 61150, Sri Lanka.
Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada.
Sci Total Environ. 2024 Jul 15;934:173296. doi: 10.1016/j.scitotenv.2024.173296. Epub 2024 May 16.
This study explored the redox-mediated changes in a lead (Pb) contaminated soil (900 mg/kg) due to the addition of solar cell powder (SC) and investigated the impact of biochar derived from soft wood pellet (SWP) and oil seed rape straw (OSR) (5% w/w) on Pb immobilization using an automated biogeochemical microcosm system. The redox potential (Eh) of the untreated (control; SC) and biochar treated soils (SC + SWP and SC + OSR) ranged from -151 mV to +493 mV. In SC, the dissolved Pb concentrations were higher under oxic (up to 2.29 mg L) conditions than reducing (0.13 mg L) conditions. The addition of SWP and OSR to soil immobilized Pb, decreased dissolved concentration, which could be possibly due to the increase of pH, co-precipitation of Pb with FeMn (hydro)oxides and pyromorphite, and complexation with biochar surface functional groups. The ability and efficiency of OSR for Pb immobilization were higher than SWP, owing to the higher pH and density of surface functional groups of OSR than SWP. Biochar enhanced the relative abundance of Proteobacteria irrespective of Eh changes, while the relative abundance of Bacteroidota increased under oxidizing conditions. Overall, we found that both OSR and SWP immobilized Pb in solar panel waste contaminated soil under both oxidizing and reducing redox conditions which may mitigate the potential risk of Pb contamination.
本研究探讨了在添加太阳能电池粉（SC）后，受污染土壤（900mg/kg）中铅（Pb）的氧化还原介导变化，并利用自动化生物地球化学微宇宙系统，研究了软木颗粒（SWP）和油菜秸秆（OSR）生物炭（5%w/w）对 Pb 固定的影响。未处理（对照；SC）和生物炭处理土壤（SC+SWP 和 SC+OSR）的氧化还原电位（Eh）范围为-151mV 至+493mV。在 SC 中，好氧条件下（高达 2.29mg/L）的溶解 Pb 浓度高于还原条件下（0.13mg/L）的溶解 Pb 浓度。SWP 和 OSR 的添加固定了土壤中的 Pb，降低了溶解浓度，这可能是由于 pH 值升高、Pb 与 FeMn（氢）氧化物和磷铅矿共沉淀以及与生物炭表面官能团络合所致。与 SWP 相比，OSR 对 Pb 的固定能力和效率更高，这是由于 OSR 的 pH 值和表面官能团密度高于 SWP。生物炭增强了变形菌门的相对丰度，而在氧化条件下，拟杆菌门的相对丰度增加。总的来说，我们发现，OSR 和 SWP 均可在氧化还原条件下固定太阳能电池板废物污染土壤中的 Pb，从而降低 Pb 污染的潜在风险。
