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| Preparation of modified zeolite and simultaneous removal of nitrogen and phosphorus from farmland drainage |
| Received:August 27, 2019 |
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| KeyWord:farmland drainage;zeolite;modified;nitrogen and phosphorus removal |
| Author Name | Affiliation | E-mail | | WANG Meng-xian | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | ZHOU You-rong | Lincang Runting Water Resources Science and Technology Service Co., Ltd., Lincang 677000, China | | | LI Ying-kai | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | FANG Yun-qing | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | QIN Yi-feng | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | | | LI Xu-dong | School of Biology and Agriculture, Shanghai Jiao Tong University, Shanghai 200240, China | lixudong@sjtu.edu.cn |
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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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