TY - JOUR
T1 - Calcium ion adsorption with extracellular proteins of thermophilic bacteria isolated from geothermal sites—A feasibility study
AU - Han, Ying Lung
AU - Lo, Yung Chung
AU - Cheng, Chieh Lun
AU - Yu, Wan Ju
AU - Nagarajan, Dillirani
AU - Liu, Chih Hsi
AU - Li, Yi Heng
AU - Chang, Jo Shu
N1 - Funding Information:
This work was supported by a grant from the Bureau of Energy , Ministry of Economic Affairs of Taiwan (Grant No. 103-DD102 ). We are also grateful to Ching-Ray Lee and Dao-Yi Jang of ITRI for their kind assistance in sampling the water samples.
Publisher Copyright:
© 2016 Elsevier B.V.
PY - 2017/1/15
Y1 - 2017/1/15
N2 - The scaling of geothermal wells arising from formation of calcium carbonate is one of the major problems associated with the utilization of geothermal energy. A novel eco-friendly biological-based approach for geothermal well descaling was proposed. Thermophilic bacterial strains were isolated from geothermal areas in Taiwan and were evaluated for their calcium adsorption efficiency under the extreme conditions. Among the eight strains isolated, Tepidimonas fonticaldi AT-A2 isolated from Antun Hot Spring, Hualien showed the highest calcium adsorption capacity. The calcium adsorbing activity of T. fonticaldi AT-A2 was mainly associated with the extracellular proteins and the maximum calcium adsorption capacity (1.94 g Ca/g protein) was obtained at pH 10, 150 °C and 1 atm pressure. This calcium adsorption efficiency is much higher than that of metallothioneins and other bacterial extracellular proteins. The excellent calcium adsorption efficiency of the AT-A2 proteins indicates the potential for their applications in biological geothermal well descaling.
AB - The scaling of geothermal wells arising from formation of calcium carbonate is one of the major problems associated with the utilization of geothermal energy. A novel eco-friendly biological-based approach for geothermal well descaling was proposed. Thermophilic bacterial strains were isolated from geothermal areas in Taiwan and were evaluated for their calcium adsorption efficiency under the extreme conditions. Among the eight strains isolated, Tepidimonas fonticaldi AT-A2 isolated from Antun Hot Spring, Hualien showed the highest calcium adsorption capacity. The calcium adsorbing activity of T. fonticaldi AT-A2 was mainly associated with the extracellular proteins and the maximum calcium adsorption capacity (1.94 g Ca/g protein) was obtained at pH 10, 150 °C and 1 atm pressure. This calcium adsorption efficiency is much higher than that of metallothioneins and other bacterial extracellular proteins. The excellent calcium adsorption efficiency of the AT-A2 proteins indicates the potential for their applications in biological geothermal well descaling.
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U2 - 10.1016/j.bej.2016.09.010
DO - 10.1016/j.bej.2016.09.010
M3 - Article
AN - SCOPUS:84989163894
SN - 1369-703X
VL - 117
SP - 48
EP - 56
JO - Biochemical Engineering Journal
JF - Biochemical Engineering Journal
ER -