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Open AccessFeature PaperArticle

Optimization of Ammonia Stripping of Piggery Biogas Slurry by Response Surface Methodology

Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
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Int. J. Environ. Res. Public Health 2019, 16(20), 3819; https://doi.org/10.3390/ijerph16203819 (registering DOI)
Received: 14 September 2019 / Revised: 4 October 2019 / Accepted: 8 October 2019 / Published: 10 October 2019
(This article belongs to the Special Issue Frontiers in Environmental Engineering)
Ammonia stripping is a pretreatment method for piggery biogas slurry, and the effectiveness of the method is affected by many factors. Based on the results of single-factor experiments, response surface methodology is adopted to establish a quadratic polynomial mathematical model relating stripping time, pH value and gas flow rate to the average removal rate of ammonia nitrogen to explore the interactions among various influencing factors, obtain optimized combined parameters for ammonia stripping, and carry out experimental verification of the parameters. The results show that when hollow polyhedral packing is adopted under operating conditions including a stripping time of 90 min, pH value of 11, gas flow rate of 28 m3/h, gas–liquid ratio of 2000 and temperature of 30 °C, the average removal rate of ammonia nitrogen in biogas slurry can reach approximately 73%. The experimental value is only 4.2% different from the predicted value, which indicates that analysis on the interaction among factors influencing ammonia stripping of biogas slurry and parameter optimization of the regression model are accurate and effective. View Full-Text
Keywords: response surface methodology; biogas slurry; ammonia stripping response surface methodology; biogas slurry; ammonia stripping
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Zou, M.; Dong, H.; Zhu, Z.; Zhan, Y. Optimization of Ammonia Stripping of Piggery Biogas Slurry by Response Surface Methodology. Int. J. Environ. Res. Public Health 2019, 16, 3819.

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