Influence of phosphate dosing on biofilms development on lead in chlorinated drinking water bioreactors.
Influence of phosphate dosing on biofilms development on lead in chlorinated drinking water bioreactors.
复制标题
投加磷酸盐对氯化饮用水生物反应器中铅生物膜形成的影响。
DOI：
10.1038/s41522-020-00152-w
复制
发表时间：
2020-10-23
影响因子：
9.2
通讯作者：
Douterelo I
中科院分区：
文献类型：
--
作者：
Del Olmo G;Ahmad A;Jensen H;Karunakaran E;Rosales E;Calero Preciado C;Gaskin P;Douterelo I
自来水公司使用磷酸盐加药来防止供水网络中的铅溶解性。然而，当饮用水系统中磷酸盐浓度被改变时，对铅和塑料材料上生物膜的形成缺乏了解。在这项研究中，生物膜生长在生物反应器中的铅试样和PVC管上，该生物反应器供应有经过处理的当地饮用水，以在28天的时间内提供不同的磷酸盐剂量（低于1，1和2 mg/L）。测试了一系列商业铁丸（GEH 104和WARP），旨在将饮用水中的磷酸盐水平保持在平均1 mg/L以下。响应于三种不同的磷酸盐处理的生物膜群落结构的变化，其特征在于通过Illumina测序的16 S rRNA基因的细菌和ITS 2基因的真菌。扫描电子显微镜被用来可视化的物理差异，在两种类型的材料，铅和PVC的生物膜的发展。磷酸盐吸收动力学的实验结果表明，从长远来看，GEH 104颗粒是降低磷酸盐水平的最佳选择，同时防止饮用水中不必要的浊度增加。富磷促进了生物膜中细菌多样性的减少，但增加了真菌的多样性。总体而言，较高的磷酸盐水平选择的微生物与磷代谢和重金属抗性相关的能力增强。这项研究为不同磷酸盐浓度对混合物种生物膜形成和饮用水质量的影响带来了新的见解，这与饮用水处理的最佳管理实践有关。
Phosphate dosing is used by water utilities to prevent plumbosolvency in water supply networks. However, there is a lack of knowledge regarding biofilm formation on lead and plastic materials when phosphate concentrations are modified in drinking water systems. In this study, biofilms were grown over lead coupons and PVC tubes in bioreactors supplied with local drinking water treated to provide different phosphate doses (below 1, 1 and 2 mg/L) over a period of 28 days. A range of commercial iron pellets (GEH104 and WARP) were tested aiming to maintain phosphate levels below the average 1 mg/L found in drinking water. Changes in biofilm community structure in response to three different phosphate treatments were characterised by Illumina sequencing of the 16S rRNA gene for bacteria and the ITS2 gene for fungi. Scanning electron microscopy was used to visualise physical differences in biofilm development in two types of materials, lead and PVC. The experimental results from the kinetics of phosphate absorption showed that the GEH104 pellets were the best option to, in the long term, reduce phosphate levels while preventing undesirable turbidity increases in drinking water. Phosphate-enrichment promoted a reduction of bacterial diversity but increased that of fungi in biofilms. Overall, higher phosphate levels selected for microorganisms with enhanced capabilities related to phosphorus metabolism and heavy metal resistance. This research brings new insights regarding the influence of different phosphate concentrations on mixed-species biofilms formation and drinking water quality, which are relevant to inform best management practices in drinking water treatment.
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影响因子：
12.8
作者：
Chandy, JP;Angles, ML
通讯作者：
Angles, ML
影响因子：
4.4
作者：
Douterelo I;Husband S;Loza V;Boxall J
通讯作者：
Boxall J
影响因子：
5.2
作者：
Alori ET;Glick BR;Babalola OO
通讯作者：
Babalola OO
影响因子：
2.6
作者：
ABDALLA, MH
通讯作者：
ABDALLA, MH
影响因子：
2.3
作者：
Cardew, P. T.
通讯作者：
Cardew, P. T.