Impact of recharge water temperature on bioclogging during managed aquifer recharge: a laboratory study | Impact de la température de l’eau de recharge sur le biocolmatage lors d’une recharge artificielle d’un aquifère: étude en laboratoire Impacto de la temperatura del agua de recarga en la obstrucción biológica durante la recarga de un acuífero con manejo: un estudio de laboratorio 回灌水温度对人工回灌含水层微生物堵塞的影响:室内研究 Impacto da temperatura da água de recarga na biocolmatação durante gerenciamento da recarga do aquífero: um estudo de laboratório
2018
Xia, Lu | Gao, Zongjun | Zheng, Xilai | Wei, Jiuchuan
To investigate the effect of recharge water temperature on bioclogging processes and mechanisms during seasonal managed aquifer recharge (MAR), two groups of laboratory percolation experiments were conducted: a winter test and a summer test. The temperatures were controlled at ~5±2 and ~15±3 °C, and the tests involved bacterial inoculums acquired from well water during March 2014 and August 2015, for the winter and summer tests, respectively. The results indicated that the sand columns clogged ~10 times faster in the summer test due to a 10-fold larger bacterial growth rate. The maximum concentrations of total extracellular polymeric substances (EPS) in the winter test were approximately twice those in the summer test, primarily caused by a ~200 μg/g sand increase of both loosely bound EPS (LB-EPS) and tightly bound EPS (TB-EPS). In the first half of the experimental period, the accumulation of bacteria cells and EPS production induced rapid bioclogging in both the winter and summer tests. Afterward, increasing bacterial growth dominated the bioclogging in the summer test, while the accumulation of LB-EPS led to further bioclogging in the winter test. The biological analysis determined that the dominant bacteria in experiments for both seasons were different and the bacterial community diversity was ~50% higher in the winter test than that for summer. The seasonal inoculums could lead to differences in the bacterial community structure and diversity, while recharge water temperature was considered to be a major factor influencing the bacterial growth rate and metabolism behavior during the seasonal bioclogging process.
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