| 镁盐改性生物质炭的合成及其在废水氮磷资源化中的应用研究 |
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| 引用本文： | James King''ori Njugun,张荣斌,李远,王学江,王健,赵建夫.镁盐改性生物质炭的合成及其在废水氮磷资源化中的应用研究[J].环境科学学报,2018,38(11):4383-4390. |
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| 作者姓名： | James King'ori Njugun 张荣斌 李远 王学江 王健 赵建夫 |
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| 作者单位： | 同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092,嘉兴市联合污水处理有限责任公司, 嘉兴 314001,1. 同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092;2. 郑州大学水利与环境学院, 郑州 450001,同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092,同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092,同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092 |
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| 基金项目： | 水体污染控制与治理科技重大专项（No.2017ZX07206-00204） |
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| 摘 要： | 通过直接沉淀-热改性法将纳米氢氧化镁晶体(Mg(OH)_2)负载在生物质炭(BC)上,系统研究了该改性材料(Mg(OH)_2-BC)对模拟废水中氮、磷的固定特性,并探讨了投加量、反应溶液pH、接触时间对吸附过程的影响.结果表明,Mg(OH)_2-BC在投加量为0.3 g·L~(-1),反应溶液初始pH为7,反应时间≥40 min时对氮、磷的固定效果最佳,最大吸附量分别达到58.8、130.0 mg·g~(-1).Mg(OH)_2-BC对氮、磷的吸附过程均符合准二级动力学模型,吸附过程受化学吸附机理的控制.通过SEM、XRD、FTIR等对反应产物进行表征分析,结果表明,Mg(OH)_2-BC对氮、磷的固定机制主要为鸟粪石结晶沉淀,也即化学沉淀.
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| 关 键 词： | 改性生物质炭 氮磷回收 资源化 鸟粪石法 |
| 收稿时间： | 2018/4/17 0:00:00 |
| 修稿时间： | 2018/5/25 0:00:00 |
Synthesis and characterization of magnesium modified biochar for ammonia and phosphorus immobilization from simulated wastewater |
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| James King''ori Njugun,ZHANG Rongbin,LI Yuan,WANG Xuejiang,WANG Jian and ZHAO Jianfu.Synthesis and characterization of magnesium modified biochar for ammonia and phosphorus immobilization from simulated wastewater[J].Acta Scientiae Circumstantiae,2018,38(11):4383-4390. |
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| Authors: | James King'ori Njugun ZHANG Rongbin LI Yuan WANG Xuejiang WANG Jian and ZHAO Jianfu |
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| Institution: | State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092,Jiaxing United Sewage Treatment Co. Ltd., Jiaxing 314001,1. State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092;2. College of Water Conservancy and Environmental Engineering, Zhengzhou University, Zhengzhou 450001,State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092,State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092 and State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092 |
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| Abstract: | A magnesium hydroxide modified biochar(Mg(OH)2-BC) composite was developed as a novel adsorbent by impregnating nano-size magnesium hydroxide(Mg(OH)2) particles on the surfaces of Biochar(BC) through a thermal-precipitation modification method. The nutrients removal mechanisms of ammonium nitrogen and phosphorus, from simulated wastewater by the adsorbent was discussed after investigating and evaluating the influence of adsorbent dosage, pH and contact time. The results show that Mg(OH)2-BC exhibited a high removal capacity with a maximum of 58.8 mg·g-1 for ammonium nitrogen and 130.0 mg·g-1 for phosphorus at adsorbent dosage of 0.3 g·L-1, initial pH 7 and contact time of 240 min. The kinetics curve of both ammonium and phosphorus adsorption process followed the pseudo-second-order kinetics model, implying that the adsorption process was mainly controlled by chemical adsorption. The recovered precipitates were characterized by field-emission scanning electron microscopy(SEM), X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FTIR). The results show that the main mechanism for ammonium and phosphorus immobilization by Mg(OH)2-BC was through chemical precipitation of struvite crystals. |
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| Keywords: | modified biochar ammonia and phosphorus removal resource recovery struvite crystallization |
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