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| Removal of ammonium nitrogen from piggery wastewater by complexation with natural plant polyphenols |
| Received:May 03, 2017 |
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| KeyWord:plant polyphenol;tannin;piggery wastewater;ammonia;complexation;removal |
| Author Name | Affiliation | E-mail | | YU Ya-lin | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | GAO Fei | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | YANG De-kun | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | LI Qi | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | SUN Lu-lu | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | LIANG Jian-ru | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | ZHOU Li-xiang | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | lxzhou@njau.edu.cn |
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| Abstract: |
| Adsorption is a proven means of efficiently removing ammonia nitrogen(NH4+-N) from wastewater, and natural plant polyphenols are reported as excellent biosorbents for the removal of NH4+-N. In the present study, a soluble natural plant polyphenol, tannin, was added into NH4+-N-containing wastewater to form a complex compound of plant polyphenol-ammonia, and then this complex compound was precipitated by a precipitant ferric sulfate. Natural plant polyphenol exhibited high adsorption capacity for NH4+ in piggery wastewater. The effects of pH, initial concentration of NH4+-N, temperature, and adsorbent dosage on the adsorption of NH4+-N were investigated. Results showed that complexation capacity of NH4+-N onto the tested natural plant polyphenol were 13.8 mg·g-1 in 3 hours, 2.4 times higher than that of zeolite. The efficiency of NH4+-N removal was increased to 16.3% with an increase in the concentration of natural plant polyphenols. Under the optimum conditions, the adsorption capacity of natural plant polyphenol for NH4+-N in piggery wastewater was 19.3 mg·g-1 which was 3.3 times higher than that of zeolite and slightly better than that of cation exchange resin. Therefore, the natural plant polyphenols possess a high adsorption capacity for NH4+-N and can be easily precipitated by ferric sulfate, which is potentially a novel approach to remove NH4+-N from wastewater. |
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