Changes in Arsenic and Copper Bioavailability and Oxytetracycline Degradation during the Composting Process
Changes in Arsenic and Copper Bioavailability and Oxytetracycline Degradation during the Composting Process
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堆肥过程中砷和铜生物利用度的变化以及土霉素降解
DOI：
10.3390/molecules24234240
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发表时间：
2019-12-01
期刊：
影响因子：
4.6
通讯作者：
Li, Zhaojun
中科院分区：
文献类型：
--
作者：
Shehata, Ebrahim;Liu, Yuanwang;Li, Zhaojun
本研究的重点是堆肥过程对土霉素抗生素降解和砷，铜的生物有效性的影响。利用土霉素、铜盐和砷盐污染的牛粪和猪粪进行堆肥试验。测定其理化性质、土霉素浓度和发芽指数的变化。铜和砷估计通过连续化学提取。通过一元回归分析，探讨了堆肥性质、土霉素浓度、重金属对发芽指数的影响。结果表明，堆肥过程对土壤中重金属的生物有效性、土霉素的降解率和发芽指数有显著的正向影响。土霉素浓度在所有处理中均下降，且在牛粪中下降更为明显。铜和砷的生物可利用态显著减少，而低生物可利用态增加。发芽指数提高50%以上，表明堆肥中不含有毒物质。这一结果还表明，堆肥性质对发芽指数的影响最显著，并且它们的回归在牛粪和猪粪处理中分别具有最高的R2值（0.84和0.99）。堆肥过程为土霉素降解和降低重金属生物有效性提供了一种经济的方法。
This research focuses on the effects of the composting process on oxytetracycline antibiotic degradation and the bioavailability of arsenic and copper. A compost experiment was conducted using cow and pig manure contaminated with oxytetracycline, and copper and arsenic salts. The changes in physicochemical properties, oxytetracycline concentration, and the germination index were measured. Copper and arsenic were estimated by sequential chemical extraction. We also detected the effects of compost properties, oxytetracycline concentration, and heavy metal (loid)s on the germination index through simple regression analysis. The results showed that the composting process positively and significantly affected heavy metal(loid)s bioavailability, oxytetracycline degradation, and the germination index. Oxytetracycline concentration declined in all treatments, and the decline was more evident in cows’ manure. The copper and arsenic bioavailable fraction decreased significantly, while the low bioavailability fraction increased. The germination index increased above 50%, which showed that the compost was free of toxic substances. This result also showed that the compost properties had the most significant impact on the germination index, and their regression had the highest R2 values (0.84 and 0.99) in the cow and pig manure treatments, respectively. In conclusion, the composting process provides an economical method for oxytetracycline degradation and heavy metal(loid)s bioavailability reduction.