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- Title
改性沸石制备及其同步去除农田排水氮磷研究.
- Authors
王梦娴; 周有荣; 李英凯; 房云清; 秦弋丰; 李旭东
- Abstract
Natural zeolite was modified to treat drainage with high nutrient concentrations from farmland.The modified zeolite was used to simultaneously adsorb NH+4-N,NO-3-N,and total phosphorus(TP)from simulated farmland drainage.The results showed that the zeolite modified by 0.01 mol·L-1LaCl3 adsorbed NH+4-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-1Cetylpyridinium Bromide(CPB)simultaneously adsorbed NH+4-N,NO-3-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-1CPB-modified and 8 g·L-1LaCl3-modified zeolite,effectively removed nutrients from the simulated farmland drainage.After 20 min of reaction and 7 min of precipitation,the effluent NH+4-N,NO-3-N,and TP concentrations were 0.23,2.18 mg·L-1,and 0.015 mg·L-1,respectively,while removal rates were95.38%,78.21%,and 97.12%,respectively.
- Subjects
ADSORPTION isotherms; ADSORPTION kinetics; ADSORPTION (Chemistry); DRAINAGE; ZEOLITES; PRECIPITATION (Chemistry); NITROGEN removal (Sewage purification); ATMOSPHERIC nitrogen
- Publication
Journal of Agro-Environment Science, 2020, Vol 39, Issue 2, p369
- ISSN
1672-2043
- Publication type
Article
- DOI
10.11654/jaes.2019-0942