Luo Xiao, Zhang Jun-Bo, He Lei, Yang Xue-Jing, Lü Peng-Yi
Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
School of Civil Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, China.
Huan Jing Ke Xue. 2021 May 8;42(5):2324-2333. doi: 10.13227/j.hjkx.202008031.
In view of the significant differences in phosphorus removal processes by different steel slags, electric furnace slag was taken as the research object to discuss the effects of environmental factors, including the adsorption time and adsorption temperature, on phosphorus removal and to verify the phosphorus removal performances of steel slag for phosphate, pyrophosphate, and actual water bodies. With the help of spectral techniques including scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), X-ray fluorescence spectroscopy(XRF), and an X-ray diffractometer(XRD), the phosphorus removal mechanisms of steel slag were explored. Moreover, the phosphorus removal abilities of different absorptive media of steel slag, ceramsite, and zeolite were compared, and the safety performances of phosphorus removal by steel slag were evaluated. The results showed that the adsorption time significantly affected the phosphorus removal efficiency of steel slag. The phosphorus removal efficiencies of phosphate solutions with a concentration range of 1-20 mg·L using steel slag could reach over 97% when the adsorption time was 30 min. The effect of temperature on phosphorus removal by steel slag was not significant. The pyrophosphate adsorption capacity of steel slag was weaker than that of orthophosphate, and the removal rate of pyrophosphate with an initial concentration of 3 mg·L was 82.45%. Spectral analysis showed that the mechanisms of phosphorus removal by steel slag were chemical adsorption assisted by physical adsorption, and calcium-phosphorus was the main precipitate component. CaHPO·2HO was the main precipitate. Steel slag exhibited excellent phosphorus removal properties for removing phosphorus in the biological pond effluent and wetland system, achieving total phosphorus removal rates of 98.36% and 93.33%, respectively. In comparison, the phosphate removal performance of steel slag was better than that of ceramsite and zeolite, and the removal efficiencies of PO were 96%, 40%, and 10%, respectively. The contents of heavy metals in the leaching solution of steel slag met the requirements of the Class I standard of surface water; thus, the steel slag was safe and reliable.
鉴于不同钢渣的除磷过程存在显著差异，以电炉渣为研究对象，探讨吸附时间和吸附温度等环境因素对除磷效果的影响，并验证钢渣对磷酸盐、焦磷酸盐及实际水体的除磷性能。借助扫描电子显微镜（SEM）、能量色散X射线光谱仪（EDS）、X射线荧光光谱仪（XRF）和X射线衍射仪（XRD）等光谱技术，探究钢渣的除磷机制。此外，比较了钢渣、陶粒和沸石等不同吸附介质的除磷能力，并评估了钢渣除磷的安全性能。结果表明，吸附时间显著影响钢渣的除磷效率。当吸附时间为30 min时，钢渣对浓度范围为1~20 mg·L的磷酸盐溶液的除磷效率可达97%以上。温度对钢渣除磷的影响不显著。钢渣对焦磷酸盐的吸附能力弱于正磷酸盐，初始浓度为3 mg·L的焦磷酸盐的去除率为82.45%。光谱分析表明，钢渣的除磷机制为物理吸附辅助的化学吸附，钙磷是主要沉淀成分。CaHPO·2H₂O是主要沉淀物。钢渣对生物塘出水和湿地系统中的磷具有优异的去除性能，总磷去除率分别达到98.36%和93.33%。相比之下，钢渣对磷酸盐的去除性能优于陶粒和沸石，PO₄³⁻的去除效率分别为96%、40%和10%。钢渣浸出液中重金属含量符合地表水Ⅰ类标准要求，因此钢渣安全可靠。
