HYDROGEN SULPHIDE ABATEMENT DURING DISCHARGE OF GEOTHERMAL STEAM FROM WELL PADS: A CASE STUDY OF WELL PAD TR-18, EL SALVADOR

https://orkustofnun.is/gogn/unu-gtp-report/UNU-GTP-2010-13.pdf

ABSTRACT
The emission of hydrogen sulphide (H2S) during geothermal development is a
significant environmental aspect that must be considered in an environmental
management plan. Wells TR-18 and TR-18A are part of the expansion of the
Berlín geothermal power plant in El Salvador. H2S emissions were estimated for
these two wells during well discharge, and calculated to be 7.1 and 42.8 g/s,
respectively. Maximum H2S concentrations in the air were also determined in the
nearby Bob Graham community using a dispersion model (SCREEN3). Four cases
were evaluated: nominal flow, 35% of the nominal flow, nominal flow with 90%
removal efficiency, and nominal flow with double stack height. Estimated
maximum concentrations in the air in the community were 54.9 and 174.2 (μg/m3
24-hour averaged) during TR-18 and TR-18A well discharges, respectively. These
estimated concentrations exceeded USEPA-California (43 μg/m3
1-hour averaged)
and Icelandic (50 μg/m3
24-hour averaged) regulations.

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