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| 响应面分析法优化稀土废水MAP沉淀法脱氮 | |
| 引用本文： | 王浩,成官文,宋晓薇,徐子涵,蒙金结,董传强. 响应面分析法优化稀土废水MAP沉淀法脱氮[J]. 环境工程学报, 2013, 7(12): 4748-4754 |
| 作者姓名： | 王浩 成官文 宋晓薇 徐子涵 蒙金结 董传强 |
| 作者单位： | 1. 桂林理工大学环境科学与工程学院, 桂林 541006;2. 桂林理工大学广西矿冶与环境科学实验中心, 桂林 541006;1. 桂林理工大学环境科学与工程学院, 桂林 541006;2. 桂林理工大学广西矿冶与环境科学实验中心, 桂林 541006;1. 桂林理工大学环境科学与工程学院, 桂林 541006;1. 桂林理工大学环境科学与工程学院, 桂林 541006;2. 桂林理工大学广西矿冶与环境科学实验中心, 桂林 541006;1. 桂林理工大学环境科学与工程学院, 桂林 541006;2. 桂林理工大学广西矿冶与环境科学实验中心, 桂林 541006;1. 桂林理工大学环境科学与工程学院, 桂林 541006;2. 桂林理工大学广西矿冶与环境科学实验中心, 桂林 541006 |
| 基金项目： | 广西重点实验室基金项目（桂科能 1201Z028） |
| 摘 要： | 经过预处理后的稀土生产废水，其氨氮浓度大幅降低，但并未达到中华人民共和国《稀土工业污染物排放标准》（GB26451-2011）中氨氮浓度限值。实验通过响应面分析法中的Box-Behnken实验设计（BBD），取pH、n（Mg）：n（N）、n（P）：n（N）3因素，采用Design-Expert 8.0.6，建立合适的剩余氨氮浓度及剩余总磷浓度模型，得到回归方程，并分析模型各项指标，各因素及其相互作用对剩余氨氮浓度及剩余总磷浓度的影响。利用预测模型预测最佳实验条件，在最佳实验条件下验证预测结果，并对沉淀物进行X射线衍射（XRD）分析。结果显示，二次响应模型适用于剩余氨氮浓度及剩余总磷浓度，2个模型均拥有较好的拟合程度、可信度及精密度，最优反应条件为：pH=9.88、n（Mg）：n（N）=1.50：1、n（P）：n（N）=1.38：1时，剩余氨氮浓度为46.58 mg/L，剩余总磷浓度为7.85 mg/L。在最优条件下所得到的沉淀物并非纯净的MgNH4PO4·6H2O，还有Mg3（PO4）2·22H2O生成。 |
| 关 键 词： | 响应面分析 氨氮 MAP 稀土废水 XRD |
Optimization of ammonia nitrogen removal from rare-earth wastewater using MAP precipitation by response surface methodology |
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| Wang Hao,Cheng Guanwen,Song Xiaowei,Xu Zihan,Meng Jinjie and Dong Chuanqiang. Optimization of ammonia nitrogen removal from rare-earth wastewater using MAP precipitation by response surface methodology[J]. Techniques and Equipment for Environmental Pollution Control, 2013, 7(12): 4748-4754 | |
| Authors: | Wang Hao Cheng Guanwen Song Xiaowei Xu Zihan Meng Jinjie Dong Chuanqiang |
| Affiliation: | 1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541006, China;1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541006, China;1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541006, China;1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541006, China;1. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, China;2. Guangxi Scientific Experiment Center of Mining, Metallurgy and Environment, Guilin University of Technology, Guilin 541006, China |
| Abstract: | Ammonia nitrogen of rare-earth wastewater was dropped largely after pretreatment,but it was not lower than the Emission Standards of Pollutants from Rare-Earth Industry (GB 26451-2011) of China. In this study,Box-Behnken Design(BBD) was applied to experimental design and optimize factors,and factors included pH,n(Mg):n(N) and n(P):n(N). Design-Expert 8.0.6,a software of response surface methodology,was used to build qualified response models of residual NH4+-N and residual TP. We got the regression equation,analyzed regression results and interaction of factors for residual NH4+-N and TP,and predicted the minimum residual NH4+-N and TP concentrations. The precipitation generated from the optimum condition was analyzed by X-Ray diffraction. The results showed that quadratic response surface models have goodness of fit,reliability and adequate precision,they are qualified to describe the change of residual NH4+-N and TP concentrations. The optimum conditions of MAP precipitation are pH=9.88,n(Mg):n(N)=1.50:1,n(P):n(N)=1.38:1,residual NH4+-N and TP concentrations are 46.58 mg/L and 7.85 mg/L, respectively. The XRD picture of precipitation shows that besides MgNH4PO4·6H2O,Mg3(PO4)2·22H2O generate in reaction process. |
| Keywords: | RSM ammonia nitrogen MAP rare-earth wastewater XRD |
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