Yuan Youquan, Wang Zhenhua, Feng Jingjie, Li Ran, Cheng Xiaolong, Li Kefeng
State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, Sichuan, China.
Environ Sci Pollut Res Int. 2022 Nov;29(51):77809-77820. doi: 10.1007/s11356-022-21181-2. Epub 2022 Jun 10.
Water environment conditions directly support aquatic life. It is important to maintain a suitable water environment to improve the efficient use of water resources. Supersaturation of total dissolved gas (TDG) in the water will cause fish suffer from gas bubble disease and even mortalities. Measures should be taken to mitigate the adverse effect of supersaturated TDG. Considering the adsorption effect of porous medium, activated carbon (AC) was utilized in this experiment to explore the effect of AC on supersaturated TDG removal. The effects of AC properties, AC dosage, and initial TDG saturation were investigated. The results showed that adding AC in the water could effectively accelerate the supersaturated TDG removal rate, which was positively correlated with the AC specific surface area and dosage. Meanwhile, the average dissipation rate of TDG increased and then decreased with increasing initial TDG saturation. The adsorption characteristics of AC on supersaturated TDG were also explored. The maximum equilibrium adsorption capacity and removal rate were 0.262 mg/g and 48.5% respectively. It was concluded that the adsorption process of AC on supersaturated TDG conformed to the Langmuir equation and pseudo-first-order kinetic model. Recycling test indicated that the used AC could be reused after drying. It was hoped that this research could contribute to improving water environment and ensuring the healthy development of the aquatic livings.
水环境条件直接支撑着水生生物的生存。维持适宜的水环境对于提高水资源的有效利用至关重要。水中总溶解气体（TDG）过饱和会导致鱼类患气泡病甚至死亡。应采取措施减轻TDG过饱和的不利影响。考虑到多孔介质的吸附作用，本实验利用活性炭（AC）来探究其对过饱和TDG去除的效果。研究了AC性质、AC投加量和初始TDG饱和度的影响。结果表明，向水中添加AC可有效加快过饱和TDG的去除速率，该速率与AC比表面积和投加量呈正相关。同时，TDG的平均消散速率随初始TDG饱和度的增加先升高后降低。还探究了AC对过饱和TDG的吸附特性。最大平衡吸附量和去除率分别为0.262 mg/g和48.5%。得出AC对过饱和TDG的吸附过程符合Langmuir方程和准一级动力学模型。循环试验表明，用过的AC干燥后可重复使用。希望本研究有助于改善水环境并确保水生生物的健康发展。
