Influence of biofilms on heavy metal immobilization in sustainable urban drainage systems (SuDS).
Influence of biofilms on heavy metal immobilization in sustainable urban drainage systems (SuDS).
复制标题
生物膜对可持续城市排水系统（SuDS）中重金属固定的影响。
DOI：
10.1080/09593330.2015.1049214
复制
发表时间：
2015
影响因子：
2.8
通讯作者：
Feder M
中科院分区：
文献类型：
--
作者：
Feder M
本文采用物理模拟和数值模拟相结合的方法，研究了生物膜对砾石滤池重金属去除效果的影响。实验流柱的构建，以确定去除的Cu，Pb和Zn的辉长岩和白云岩砾石岩性，有和没有自然生物膜从可持续城市排水系统（SuDS）。突破性的实验表明，虽然非生物砾石过滤器去除高达51%的金属，那些与生物膜增强重金属去除高达进一步29%，与铜去除说明最大的响应生物膜生长。对流扩散方程成功地模拟了金属示踪剂在生物膜柱内的运输。该模型得到的金属示踪剂的永久损失项（k）在0.01和1.05之间，与突破实验的测量数据相关性很好。额外的16S rRNA克隆文库分析的生物膜表明，细菌群落组成的过滤介质的岩性，辉长岩过滤器显示Proteobacteriadominance（54%）和白云石列显示蓝藻adominance（47%）的强烈敏感性。
This paper physically and numerically models the influence of biofilms on heavy metal removal in a gravel filter. Experimental flow columns were constructed to determine the removal of Cu, Pb and Zn by gabbro and dolomite gravel lithologies with and without natural biofilm from sustainable urban drainage systems (SuDS). Breakthrough experiments showed that, whilst abiotic gravel filters removed up to 51% of metals, those with biofilms enhanced heavy metal removal by up to a further 29%, with Cu removal illustrating the greatest response to biofilm growth. An advection–diffusion equation successfully modelled metal tracer transport within biofilm columns. This model yielded a permanent loss term (k) for metal tracers of between 0.01 and 1.05, correlating well with measured data from breakthrough experiments. Additional 16S rRNA clone library analysis of the biofilm indicated strong sensitivity of bacterial community composition to the lithology of the filter medium, with gabbro filters displayingProteobacteriadominance (54%) and dolomite columns showingCyanobacteriadominance (47%).