EXAMINATION AND CHARACTERIZATION OF DISTRIBUTION-SYSTEM BIOFILMS
EXAMINATION AND CHARACTERIZATION OF DISTRIBUTION-SYSTEM BIOFILMS
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DOI：
10.1128/aem.53.12.2714-2724.1987
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发表时间：
1987-12-01
影响因子：
4.4
通讯作者：
LEE, RG
中科院分区：
文献类型：
--
作者：
LECHEVALLIER, MW;BABCOCK, TM;LEE, RG
在美国新泽西州自来水厂进行了配水系统生物膜对水质影响的研究。该公用事业在分配系统中经历了长期的细菌学问题，而处理厂的污水对大肠菌群细菌均呈阴性。监测程序的结果显示，随着水从处理厂通过分配系统，大肠菌群水平增加。大肠菌群密度的增加不能仅仅由水柱中细胞的生长来解释。大肠菌群的鉴定表明，随着水流经过研究区域，物种多样性增加。分布系统中所有材料均有高密度的异养平板计数细菌，而大肠菌群仅在铁结核中检测到高水平。在分布系统生物膜和水柱中均发现具有相同生化特征的大肠菌群。可同化有机碳测定表明，随着水流经研究区域，碳水平下降。维持1.0 mg/l的游离氯残留量不足以控制大肠菌群的发生。对研究区域进行冲洗和清管并不能有效控制该区域大肠菌群的出现。由于在分配系统生物膜中生长的大肠菌群可能会掩盖由于真正破坏处理屏障而导致的指示生物的存在，报告建议继续努力寻找控制管道生物膜中大肠菌群生长的方法。
Investigations concerning the role of distribution system biofilms on water quality were conducted at drinking water utility in New Jersey. The utility experienced long-term bacteriological problems in the distribution system, while treatment plant effluents were uniformly negative for coliform bacteria. Results of a monitoring program showed increased coliform levels as the water moved from the treatment plant through the distribution system. Increased coliform densities could not be accounted for by growth of the cells in the water column alone. Identification of coliform bacteria showed that species diversity increased as water flowed through the study area. All materials in the distribution system had high densities of heterotrophic plate count bacteria, while high levels of coliforms were detected only in iron tubercles. Coliform bacteria with the same biochemical profile were found both in distribution system biofilms and in the water column. Assimilable organic carbon determinations showed that carbon levels declined as water flowed through the study area. Maintenance of a 1.0-mg/liter free chlorine residual was insufficient to control coliform occurrences. Flushing and pigging the study area was not an effective control for coliform occurrences in that section. Because coliform bacteria growing in distribution system biofilms may mask the presence of indicator organisms resulting from a true breakdown of treatment barriers, the report recommends that efforts continue to find methods to control growth of coliform bacteria in pipeline biofilms.