Effects of cold recovery technology on the microbial drinking water quality in unchlorinated distribution systems
文献类型：期刊论文
| 作者 | Ahmad, Jawairia Imtiaz; Liu, Gang; van der Wielen, Paul W. J. J.; Medema, Gertjan; van der Hoek, Jan Peter |
| 刊名 | ENVIRONMENTAL RESEARCH
 |
| 出版日期 | 2020-04 |
| 卷号 | 183页码:1-18 |
| 关键词 | Drinking water distribution system Microbial ecology Cold recovery Drinking water quality Biofilm Bacterial community Opportunistic pathogens |
| ISSN号 | 0013-9351 |
| 英文摘要 | Drinking water distribution systems (DWDSs) are used to supply hygienically safe and biologically stable water for human consumption. The potential of thermal energy recovery from drinking water has been explored recently to provide cooling for buildings. Yet, the effects of increased water temperature induced by this cold recovery on the water quality in DWDS5 are not known. The objective of this study was to investigate the impact of cold recovery from DWDS5 on the microbiological quality of drinking water. For this purpose, three pilot distribution systems were operated in parallel for 38 weeks. System 1 has an operational heat exchanger, mimicking the cold recovery system by maintaining the water temperature at 25 C; system 2 operated with a non-operational heat exchanger and system 3 run without heat exchanger. The results showed no significant effects on drinking water quality: cell numbers and ATP concentrations remained around 3.5 x 10(5) cells/ml and 4 ng ATP/1, comparable observed operational taxonomic units (OTUs) (similar to 470-490) and similar Shannon indices (7.7-8.9). In the system with cold recovery, a higher relative abundance of Pseudomonas spp. and Chryseobacterium spp. was observed in the drinking water microbial community, but only when the cold recovery induced temperature difference (Delta T) was higher than 9 degrees C. In the 38 weeks' old biofilm, higher ATP concentration (475 vs. 89 pg/cm(2)), lower diversity (observed OTUs: 88 vs. >= 200) and a different bacterial community composition (e.g. higher relative abundance of Novosphingobium spp.) were detected, which did not influence water quality. No impacts were observed for the selected opportunisitic pathogens after introducing cold recovery. It is concluded that cold recovery does not affect bacterial water quality. Further investigation for a longer period is commended to understand the dynamic responses of biofilm to the increased temperature caused by cold recovery. |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45276]  |
| 专题 | 生态环境研究中心_中国科学院饮用水科学与技术重点实验室 |
| 推荐引用方式 GB/T 7714 | Ahmad, Jawairia Imtiaz,Liu, Gang,van der Wielen, Paul W. J. J.,et al. Effects of cold recovery technology on the microbial drinking water quality in unchlorinated distribution systems[J]. ENVIRONMENTAL RESEARCH,2020,183:1-18. |
| APA | Ahmad, Jawairia Imtiaz,Liu, Gang,van der Wielen, Paul W. J. J.,Medema, Gertjan,&van der Hoek, Jan Peter.(2020).Effects of cold recovery technology on the microbial drinking water quality in unchlorinated distribution systems.ENVIRONMENTAL RESEARCH,183,1-18. |
| MLA | Ahmad, Jawairia Imtiaz,et al."Effects of cold recovery technology on the microbial drinking water quality in unchlorinated distribution systems".ENVIRONMENTAL RESEARCH 183(2020):1-18. |
入库方式： OAI收割
来源：生态环境研究中心
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