| 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. |
| 改性沸石制备及其同步去除农田排水氮磷研究 |
| Preparation of modified zeolite and simultaneous removal of nitrogen and phosphorus from farmland drainage |
| 投稿时间：2019-08-27 |
| DOI：10.11654/jaes.2019-0942 |
| 中文关键词: 农田排水 沸石 改性 氮磷去除 |
| 英文关键词: farmland drainage zeolite modified nitrogen and phosphorus removal |
| 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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| 中文摘要: |
| 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、NO3--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0.01 mol·L-1 LaCl3改性的沸石对NH4+-N和TP具有良好的吸附效果，可在10min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0.02 mol·L-1溴代十六烷基吡啶（CPB）改性的沸石可同时吸附NH4+-N、NO3--N和TP，在20 min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。15 g·L-1的CPB改性沸石与8 g·L-1的LaCl3改性沸石组合处理模拟农田排水，反应20 min，沉淀7 min后，出水NH4+-N、NO3--N和TP浓度分别为0.23、2.18 mg·L-1和0.015 mg·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。 |
| 英文摘要: |
| 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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