Nayak Sneha, Goveas Louella Concepta
Department of Biotechnology Engineering, Nitte (Deemed to Be University), NMAM Institute of Technology (NMAMIT), Nitte, India.
Biodegradation. 2025 May 3;36(3):36. doi: 10.1007/s10532-025-10136-2.
Water pollution due to overuse of dyes or improper remediation in industrial settings is posing a threat to aquatic life, environment and health. Due to world-wide scarcity of clean water, treatment and re-utilization of wastewater is the top-most priority, aiding in achievement of sustainable development goals. Even after suitable wastewater treatment, residual pollutants persist, leading to their over-accumulation on recurrent release at the same site. Hence, in this context, the present study reports the adsorption of methyl green dye at trace concentrations (< 10 mg/L) by EPS secreted by Lysinibacillus SS1 (EPS-SS1). One-variable-at-a-time strategy was employed to obtain maximum adsorption % and capacity of 99.14 and 1057.11 mg/g at 8 mg/L methyl green, 7.5 mg/L EPS, at pH 8, 35 ºC, with no agitation in 40 min contact time. The data for adsorption process fit Freundlich isotherm and PSO kinetics at highest R of 0.9982 and 0.9859 for non-linear and linear forms respectively. This implied that the adsorbent surface is heterogenous, with varied surface energies, resulting in multi-layer adsorption. Therefore, it was confirmed that energy-efficient adsorption by EPS-SS1 is an effective, eco-friendly method of residual pollutants in contaminated wastewater with easy scale-up.
工业环境中染料的过度使用或不当修复造成的水污染正威胁着水生生物、环境和健康。由于全球清洁水资源稀缺，废水处理和再利用是最优先事项，有助于实现可持续发展目标。即使经过适当的废水处理，残留污染物仍会存在，导致它们在同一地点反复排放时过度积累。因此，在这种背景下，本研究报告了赖氨酸芽孢杆菌SS1（EPS-SS1）分泌的胞外聚合物对痕量浓度（<10 mg/L）甲基绿染料的吸附情况。采用一次改变一个变量的策略，在8 mg/L甲基绿、7.5 mg/L EPS、pH值8、35 ºC、40分钟接触时间且无搅拌的条件下，获得了最大吸附率99.14%和吸附容量1057.11 mg/g。吸附过程的数据分别以非线性和线性形式拟合Freundlich等温线和PSO动力学，最高相关系数R分别为0.9982和0.9859。这意味着吸附剂表面是不均匀的，具有不同的表面能，导致多层吸附。因此，已证实EPS-SS1的高效吸附是一种有效、环保的处理受污染废水中残留污染物的方法，且易于扩大规模。
