Acidic conditions enhance the removal of sulfonamide antibiotics and antibiotic resistance determinants in swine manure
文献类型： 外文期刊
作者： Lin, Hui 1 ; Sun, Wanchun 1 ; Yu, Qiaogang 1 ; Ma, Junwei 1 ;
作者机构： 1.Zhejiang Acad Agr Sci, Inst Environm Resources Soil & Fertilizers, Hangzhou 310021, Peoples R China
关键词： pH; Antibiotic degradation; Antibiotic resistance genes; Antibiotic-resistant bacteria; Manure
期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）
ISSN： 0269-7491
年卷期： 2020 年 263 卷
页码：
收录情况： SCI
摘要： Manure pH may vary depending on its inherent composition or additive contents. However, the effect of pH on the fate of antibiotics and antibiotic resistance determinants in manure remains unclear. This work demonstrated that pH adjustment promoted the removal of different sulfonamide antibiotics (SAs) within swine manure under incubation conditions, which increased from 26-60.8% to 75.0-86.0% by adjusting the initial pH from neutral (7.4) to acidic (5.4-4.8). Acidification was also demonstrated to inhibit the accumulation of antibiotic resistance genes in manure during incubation. Acidified manure contained both lower absolute and relative abundances of sul1 and sul2 than those at a neutral pH like 7.4. Further investigation indicated that acidification promoted the reduction of sul genes in manure by restricting sulfonamide-resistant bacteria (SRB) proliferation and inhibiting IntI1 accumulation. Furthermore, pH adjustment significantly influenced the composition of the manure bacterial community after incubation, which increased Firmicutes and decreased Proteobacteria. Close relationships were observed between pH- induced enrichment of the Firmicutes bacterial phylum, enhanced SAs degradation, and the fates of antibiotic resistance determinants. Overall, lowering the pH of manure promotes the degradation of SAs, decreases sul genes and SRB, and inhibits horizontal sul gene transfer, which could be a simple yet highly-effective manure management option to reduce antibiotic resistance. (c) 2020 Elsevier Ltd. All rights reserved.
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