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Cuiping Li Fangqiong Ling Minglu Zhang Wen-Tso Liu Yuxian Li Wenjun Liu 《环境科学学报(英文版)》2017,29(1):21-30
Understanding the spatial and temporal dynamics of microbial communities in drinking water systems is vital to securing the microbial safety of drinking water. The objective of this study was to comprehensively characterize the dynamics of microbial biomass and bacterial communities at each step of a full-scale drinking water treatment plant in Beijing, China. Both bulk water and biofilm samples on granular activated carbon (GAC) were collected over 9 months. The proportion of cultivable cells decreased during the treatment processes, and this proportion was higher in warm season than cool season, suggesting that treatment processes and water temperature probably had considerable impact on the R2A cultivability of total bacteria. 16s rRNA gene based 454 pyrosequencing analysis of the bacterial community revealed that Proteobacteria predominated in all samples. The GAC biofilm harbored a distinct population with a much higher relative abundance of Acidobacteria than water samples. Principle coordinate analysis and one-way analysis of similarity indicated that the dynamics of the microbial communities in bulk water and biofilm samples were better explained by the treatment processes rather than by sampling time, and distinctive changes of the microbial communities in water occurred after GAC filtration. Furthermore, 20 distinct OTUs contributing most to the dissimilarity among samples of different sampling locations and 6 persistent OTUs present in the entire treatment process flow were identified. Overall, our findings demonstrate the significant effects that treatment processes have on the microbial biomass and community fluctuation and provide implications for further targeted investigation on particular bacteria populations. 相似文献
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好氧堆肥是畜禽粪便处置和资源化利用的主要途径.传统好氧堆肥(CAC)技术存在堆体温度低、发酵周期长、腐熟效果差等缺陷.最近研究发现,电场辅助好氧堆肥(EAAC)可快速促进堆肥腐熟,缩短堆肥周期,减少温室气体排放,具有潜在的应用前景.然而,电场促进堆肥过程中水溶性有机物(DOM)演化及腐殖化过程尚未清晰.基于此,本文采用紫外-可见光谱(UV-Vis)、傅里叶变换红外光谱(FTIR)和三维荧光光谱(3D-EEM)等多种光谱技术分析了EAAC过程中DOM的演变规律.UV-Vis与3D-EEM分析表明,EAAC过程中,蛋白类物质在3 d内几乎被完全分解,富里酸和腐殖酸类物质在高温期(6~18 d)大量形成.EAAC的腐殖化指数(HI=HA/FA)高于CAC,E4/E6低于CAC,说明堆肥过程中DOM芳香化和腐殖化的速度与程度均优于CAC. FTIR分析显示,EAAC过程中DOM的碳水化合物、脂肪类物质逐渐减少,芳香族化合物不断增加,其腐殖化趋势明显比CAC更快.相关性分析显示,PⅤ,n/PⅢ,n与A240~400、SUVA254、E253/E220等UV-Vis光谱指标呈显著正相关(r>0.8, p<0.05),可以作为评价EAAC腐熟度的重要指标.上述结果表明,电场辅助好氧堆肥可加速DOM中蛋白类物质分解,加快富里酸和腐殖酸类物质形成,促进DOM结构的芳香化. 相似文献
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Li Haifeng Liu Yuxian Lan Yongyin Zhao Yanan Lu Anxiang Li Cheng Lei Rongrong Xue Jingchuan Liu Wenbin 《Environmental science and pollution research international》2022,29(39):58828-58842
Environmental Science and Pollution Research - Despite the restrictions on polybrominated diphenyl ethers (PBDEs) and hexabromocyclododecanes (HBCDDs), these chemicals are still ubiquitous... 相似文献
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Ding Zijuan Hu Ren Styles David Wang Xiaolong Tian Yingbing Cao Yuxian Hou Jun 《Environmental science and pollution research international》2022,29(17):24639-24650
Environmental Science and Pollution Research - Ratoon rice (RR) is regarded as a labor-saving and efficient approach to rice cultivation; however, sub-optimal production techniques (fertilization,... 相似文献