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| Mechanisms of Nitrogen and Phosphorus Adsorption from Biogas Slurry of Piggery by Modified Zeolite |
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| KeyWord:modified zeolite; biogas slurry of piggery; adsorption isotherm models; pseudo second-order kinetic model |
| Author Name | Affiliation | | ZHANG Wen-yi | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | | ZHENG Ze-xin | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | | HAN You-fa | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China | | ZHAN Ming-fei | School of Environmental & Safety Engineering, Changzhou University, Changzhou 213164, China |
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| Abstract: |
| Biogas slurry is rich in nutrients, such as nitrogen, phosphorus and organic compounds. Removals of these nutrients will reduce biogas slurry risks to the environment. In this study, adsorption characteristics of nitrogen and phosphorus from biogas slurry were investigated using modified zeolite under different zeolite doses, adsorption times, and initial concentrations of biogas slurry. The removal mechanisms of nitrogen and phosphorus by the modified zeolite were also explored. At 10 g per100mL of zeolite and 48 h of adsorption time, the removal rates of NH+4 and TP were up to 90.66% and 85.97%, with maximal adsorption capacity of 1.43 mg·g-1 and 0.16 mg·g-1, respectively. The zeolite after adsorption contained high nitrogen and phosphorus, and was a high quality slow-release fertilizer. Nitrogen and phosphorus adsorption could be better fitted by Freundlich and Langmuir isotherm models, with R2 over 0.98. Their adsorption kinetics followed the pseudo second-order kinetic model. Organic nitrogen and phosphorus removals by the zeolite were mainly via physical adsorption and coordination reaction, while inorganic ones through ion exchange and precipitation. |
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