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| The degradation and adsorption of sulfonamides in mesophilic anaerobic digestion of swine manure |
| Received:March 07, 2017 |
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| KeyWord:sulfonamides;biological degradation;adsorption;co-metabolism |
| Author Name | Affiliation | | JIN Hong-mei | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences
Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
East China Scientific Observing and Experimental Station of Development and Utilization of Rural Renewable Energy, Ministry of Agriculture, Nanjing 210014, China | | XU Cai-yun | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences
Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | HUANG Hong-ying | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences
Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
East China Scientific Observing and Experimental Station of Development and Utilization of Rural Renewable Energy, Ministry of Agriculture, Nanjing 210014, China | | XU Yue-ding | Circular Agriculture Research Center, Jiangsu Academy of Agricultural Sciences
Jiangsu Agricultural Waste Treatment and Recycle Engineering Research Center, Nanjing 210014, China
East China Scientific Observing and Experimental Station of Development and Utilization of Rural Renewable Energy, Ministry of Agriculture, Nanjing 210014, China |
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| Abstract: |
| Concentrated animal feeding operations(CAFOs) are considered to be point sources of sulfonamide(SAs) pollution. Anaerobic digestion(AD) is used to treat manure and wastewater from CAFOs, reducing contamination and producing renewable energy and bio-fertilizer. However, little is known about how the AD process affects SAs. In this study, bench-scale batch experiments were conducted to investigate the biodegradation and adsorption characteristics of sulfadiazine(SDZ) and sulfamethazine(SM2) via AD of swine manure under mesophilic conditions[(37±1)℃]. The removal rates of SDZ and SM2 were 58.7% and 74.0%, respectively, at initial concentrations of 20 mg·L-1. The first-order model best fit SDZ and SM2 removal dynamics, with degradation half-lives of 5.85 d and 5.90 d, respectively. Adsorption was rapid early in the AD process; SDZ and SM2 were adsorbed rapidly on solid digestates within 4 h and reached adsorption equilibrium within 12 h. After this point, slow biodegradation occurred, and was the dominant SDZ and SM2 removal pathway after 24 h. The removal rate through biodegradation reached>80% for both SAs. SAs removal was significantly correlated with the soluble chemical oxygen demand(SCOD), indicating that degradable organic matter was co-metabolized during SAs removal during AD of swine manure. |
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