Abstract
ABSTRACT Excessive atmospheric H2S (hydrogen sulfide) emissions from large salt evaporation ponds in San Francisco Bay, California, and the effectiveness of possible remedies have been studied since 1989. These emissions are caused by filamentous algae (Cladophora spp., Enteromorpha spp.) which accumulate on the downwind shores, and decay under anoxic conditions. On-site pilot experiments were used to test the effectiveness of two methods of controlling H2S emissions: harvesting the shoreline accumulation of filamentous algae and the use of a barrier (“phytofence”) to prevent accumulation of algae onshore. Replicate experimental plots were set up along a portion of the downwind (east) shore. Atmospheric H2S concentrations above the phytofence plots were significantly lower than above both control and harvest plots. In addition, total dissolved sulfide was significantly lower and dissolved oxygen significantly higher in the phytofence plots than in control and harvest plots. Thus, a phytofence may be a via...
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