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For high acid and high chlorine uranium-containing wastewater ([H+] = 1.05 mol/L, ρ(Cl-)=120 g/L, uranium existing as ), the adsorption behavior and mechanism of H6, T1 acid- and chlorine- tolerant resin and 201×7 resin on uranium were compared and studied. The results show that the equilibrium adsorption capacity (24.9 and 23.2 mg/g) and adsorption rate of uranium for H6 and T1 resins are significantly higher than those of 201×7 resin. All three resins follow the pseudo-second-order kinetic model (R2=0.999), indicating that chemical adsorption dominates the process. The adsorption process of uranium on the three resins is more consistent with the Langmuir isothermal adsorption model, and the adsorption is mainly monolayer adsorption. However, the surface active sites of T1 resin are more uniform, and the adsorption selectivity is stronger (b=0.32-0.52 L/mg). The maximum adsorption capacity of H6 resin is the highest (27.9-31.0 mg/g), and its Freundlich fitting is also good (R2=0.971-0.982, n=3.4-4.0), showing characteristics of multi-molecular layer adsorption. The results of dynamic breakthrough tests show that the adsorption performance of H6 and T1 resins for uranium is better than that of 201×7 resin. In contrast, H6 resin has a faster adsorption rate, higher effective capacity utilization, and more engineering potential in the early stage. The results of leaching and desorption experiments show that, under the premise of similar leaching rates, the leaching efficiency at 2 BV/h (contact time 0.2 h) is higher and yields a qualified solution with higher uranium concentration. This study can provide some technical reference for resin screening and process optimization under extreme water quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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