1 research outputs found
Biodegradation of <i>cis</i>-1,2-Dichloroethene in Simulated Underground Thermal Energy Storage Systems
Underground
thermal energy storage (UTES) use has showed a sharp
rise in numbers in the last decades, with aquifer thermal energy storage
(ATES) and borehole thermal energy storage (BTES) most widely used.
In many urban areas with contaminated aquifers, there exists a desire
for sustainable heating and cooling with UTES and a need for remediation.
We investigated the potential synergy between UTES and bioremediation
with batch experiments to simulate the effects of changing temperature
and liquid exchange that occur in ATES systems, and of only temperature
change occurring in BTES systems on <i>cis</i>-DCE reductive
dechlorination. Compared to the natural situation (NS) at a constant
temperature of 10 °C, both UTES systems with 25/5 °C for
warm and cold well performed significantly better in <i>cis</i>-DCE (<i>cis</i>-1,2-dichloroethene) removal. The overall
removal efficiency under
mimicked ATES and BTES conditions were respectively 13 and 8.6 times
higher than in NS. Inoculation with <i>Dehalococcoides</i> revealed that their initial presence is a determining factor for
the dechlorination process. Temperature was the dominating factor
when <i>Dehalococcoides</i> abundance was sufficient. Stimulated
biodegradation was shown to be most effective in the mimicked ATES
warm well because of the combined effect of suitable temperature,
sustaining biomass growth, and regular <i>cis</i>-DCE supply