| 改性沸石制备及其同步去除农田排水氮磷研究 |
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| 引用本文： | 王梦娴,周有荣,李英凯,房云清,秦弋丰,李旭东.改性沸石制备及其同步去除农田排水氮磷研究[J].农业环境科学学报,2020,39(2):369-377. |
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| 作者姓名： | 王梦娴 周有荣 李英凯 房云清 秦弋丰 李旭东 |
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| 作者单位： | 上海交通大学农业与生物学院,上海 200240;临沧润汀水资源科技服务有限公司,云南 临沧 677000 |
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| 基金项目： | 国家科技部重点研发计划项目"水稻主产区氮磷流失综合防控技术与产品研发"（2016YFD0800500） |
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| 摘 要： | 为进行高浓度农田排水的应急处理,以天然斜发沸石为原料,制备能够同步吸附NH4+-N、NO-3-N和TP的组合改性沸石,并对人工模拟农田排水进行处理。结果表明:采用0.01mol L-1LaCl3改性的沸石对NH+4-N和TP具有良好的吸附效果,可在10 min内达到吸附平衡,且与Freundlich等温吸附模型拟合度较高(R2>0.99);采用0.02mol L-1溴代十六烷基吡啶(CPB)改性的沸石可同时吸附NH+4-N、NO3--N和TP,在20min内即可达到吸附平衡,其与Langmuir等温吸附模型相关度较高(R2>0.97)。这两种改性沸石的吸附过程均符合准二级动力学模型。15g L-1的CPB改性沸石与8g L-1的LaCl3改性沸石组合处理模拟农田排水,反应20min,沉淀7min后,出水NH+4-N、NO3--N和TP浓度分别为0.23、2.18mg L-1和0.015mg L-1,去除率分别为95.38%、78.21%和97.12%。研究表明组合改性沸石可快速高效地处理农田排水。
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| 关 键 词： | 农田排水 沸石 改性 氮磷去除 |
| 收稿时间： | 2019/8/27 0:00:00 |
Preparation of modified zeolite and simultaneous removal of nitrogen and phosphorus from farmland drainage |
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| WANG Meng-xian,ZHOU You-rong,LI Ying-kai,FANG Yun-qing,QIN Yi-feng and LI Xu-dong.Preparation of modified zeolite and simultaneous removal of nitrogen and phosphorus from farmland drainage[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2020,39(2):369-377. |
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| Authors: | WANG Meng-xian ZHOU You-rong LI Ying-kai FANG Yun-qing QIN Yi-feng and LI Xu-dong |
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| Institution: | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China,Lincang Runting Water Resources Science and Technology Service Co., Ltd., Lincang 677000, China,School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China,School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China,School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China and School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | Natural zeolite was modified to treat drainage with high nutrient concentrations from farmland. The modified zeolite was used to simultaneously adsorb NH4+-N, NO3--N, and total phosphorus(TP)from simulated farmland drainage. The results showed that the zeolite modified by 0.01 mol·L-1 LaCl3 adsorbed NH4+-N and TP well with an adsorption equilibrium that was achieved within 10 min. The adsorption isotherms were fitted the best by the Freundlich model(R2>0.99). The zeolite modified by 0.02 mol·L-1 Cetylpyridinium Bromide (CPB)simultaneously adsorbed NH4+-N, NO3--N, and TP, and achieved an adsorption equilibrium within 20 min. The adsorption isotherms correlated well with the Langmuir model(R2>0.97). The pseudo-second-order model simulated the adsorption kinetics of the two modified zeolites very well. The combination of the two types of modified zeolite, at a concentration of 15 g·L-1 CPB-modified and 8 g·L-1 LaCl3-modified zeolite, effectively removed nutrients from the simulated farmland drainage. After 20 min of reaction and 7 min of precipitation, the effluent NH4+-N, NO3--N, and TP concentrations were 0.23, 2.18 mg·L-1, and 0.015 mg·L-1, respectively, while removal rates were 95.38%, 78.21%, and 97.12%, respectively. |
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| Keywords: | farmland drainage zeolite modified nitrogen and phosphorus removal |
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