黄廷林1,
胡瑞柱1,
张瑞峰1,
智奥帆1
1.西安建筑科技大学环境与市政工程学院，西安 710055
基金项目: 国家重点研发计划课题（2016YFC0400706）
Simultaneous removal of iron, manganese and hardness by pellet fluidized bed reactor in pilot-scale experiment
TANG Zhangcheng1,,HUANG Tinglin1,
HU Ruizhu1,
ZHANG Ruifeng1,
ZHI Aofan1
1.School of Environment and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
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摘要:为了实现水中的铁、锰及硬度的同步去除，利用结晶造粒流化床，在中试规模条件下，考察了药剂投加量、晶种填充高度、水力负荷、连续运行时间等因素对出水效果的影响。结果表明，在进水硬度、铁和锰平均浓度分别为300、0.90和1.90 mg·L?1条件下，当水力负荷为13 m·h?1，晶种填充高度为50 cm，NaOH投加量为100 mg·L?1时，出水水质达标，大部分污染物在流化床底部被去除，出水效果随着运行时间的推移有所增强，硬度、铁及锰的去除率分别为59%、70.6%和96.7%，出水pH为9.6；此外，水中硬度的含量较高时，流化床对锰的去除难度加大。通过对长期运行后晶种的结构变化进行SEM﹑EDS和XPS表征，发现流化床运行过程中，结晶颗粒逐渐长大，表面形成致密的结晶产物，其主要成分为CaCO3、FeOOH、Fe3O4、Mn3O4和MnO2等构成的复合物。研究结果为水中铁﹑锰及硬度的同步去除提供可借鉴的理论参考,具有一定的实践指导意义。
关键词: 结晶造粒流化床/
软化/
铁/
锰/
同步去除
Abstract:In order to achieve simultaneous removal of iron, manganese and hardness from water, the effects of operational conditions, including chemical reagent dosage, seed packing height, hydraulic loading and continuous running time, etc., on the performance of a pilot-scale pellet fluidized bed reactor were investigated. The results showed that the effluent water quality could meet the related standards and became better with the running extension at the hardness of 300 mg·L?1, average iron concentration of 0.90 mg·L?1 and average manganese concentration of 1.90 mg·L?1 in influent water, as well as the hydraulic loading rate of 13 m·h?1, calcium carbonate crystal seed packing height of 50 cm and NaOH dosage of 100 mg·L?1. Most of the contaminants were removed at the bottom of the pellet fluidized bed, the removal rates of hardness, iron and manganese were up to 59%, 70.6% and 96.7%, respectively, and the pH of effluent water was 9.6. In addition, the manganese removal by fluidized bed became difficult with the increase of influent hardness. According to the SEM, EDS and XPS detection for the seeds after long-term operation of reactor, it was found that the seeds gradually grew up during the running, which was covered by a compact crystallized product layer of a mixture of CaCO3, FeOOH, Fe3O4, Mn3O4 and MnO2. The results can provide a theoretical reference for the simultaneous removal of iron, manganese and hardness in water and guide the corresponding removal practice to some extent.
Key words:pellet fluidized reactor/
softening/
iron/
manganese/
simultaneous removal.
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结晶造粒流化床同步去除水中铁、锰及硬度的中试实验
唐章程1,,黄廷林1,
胡瑞柱1,
张瑞峰1,
智奥帆1
1.西安建筑科技大学环境与市政工程学院，西安 710055
基金项目: 国家重点研发计划课题（2016YFC0400706）
关键词: 结晶造粒流化床/
软化/
铁/
锰/
同步去除
摘要:为了实现水中的铁、锰及硬度的同步去除，利用结晶造粒流化床，在中试规模条件下，考察了药剂投加量、晶种填充高度、水力负荷、连续运行时间等因素对出水效果的影响。结果表明，在进水硬度、铁和锰平均浓度分别为300、0.90和1.90 mg·L?1条件下，当水力负荷为13 m·h?1，晶种填充高度为50 cm，NaOH投加量为100 mg·L?1时，出水水质达标，大部分污染物在流化床底部被去除，出水效果随着运行时间的推移有所增强，硬度、铁及锰的去除率分别为59%、70.6%和96.7%，出水pH为9.6；此外，水中硬度的含量较高时，流化床对锰的去除难度加大。通过对长期运行后晶种的结构变化进行SEM﹑EDS和XPS表征，发现流化床运行过程中，结晶颗粒逐渐长大，表面形成致密的结晶产物，其主要成分为CaCO3、FeOOH、Fe3O4、Mn3O4和MnO2等构成的复合物。研究结果为水中铁﹑锰及硬度的同步去除提供可借鉴的理论参考,具有一定的实践指导意义。
English Abstract
Simultaneous removal of iron, manganese and hardness by pellet fluidized bed reactor in pilot-scale experiment
TANG Zhangcheng1,,HUANG Tinglin1,
HU Ruizhu1,
ZHANG Ruifeng1,
ZHI Aofan1
1.School of Environment and Municipal Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China
Keywords: pellet fluidized reactor/
softening/
iron/
manganese/
simultaneous removal
Abstract:In order to achieve simultaneous removal of iron, manganese and hardness from water, the effects of operational conditions, including chemical reagent dosage, seed packing height, hydraulic loading and continuous running time, etc., on the performance of a pilot-scale pellet fluidized bed reactor were investigated. The results showed that the effluent water quality could meet the related standards and became better with the running extension at the hardness of 300 mg·L?1, average iron concentration of 0.90 mg·L?1 and average manganese concentration of 1.90 mg·L?1 in influent water, as well as the hydraulic loading rate of 13 m·h?1, calcium carbonate crystal seed packing height of 50 cm and NaOH dosage of 100 mg·L?1. Most of the contaminants were removed at the bottom of the pellet fluidized bed, the removal rates of hardness, iron and manganese were up to 59%, 70.6% and 96.7%, respectively, and the pH of effluent water was 9.6. In addition, the manganese removal by fluidized bed became difficult with the increase of influent hardness. According to the SEM, EDS and XPS detection for the seeds after long-term operation of reactor, it was found that the seeds gradually grew up during the running, which was covered by a compact crystallized product layer of a mixture of CaCO3, FeOOH, Fe3O4, Mn3O4 and MnO2. The results can provide a theoretical reference for the simultaneous removal of iron, manganese and hardness in water and guide the corresponding removal practice to some extent.
