The present invention provides for a genetically modified host cell or bacterium capable of producing an organic molecule, wherein the bacterium is capable of using hydrogen sulfide as an electron donor, carbon dioxide (CO.sub.2) as a carbon source, and/or nitrate as an electron acceptor. The present invention is useful in the wastewater treatment industry, in particular in municipal wastewater treatment plants (WWTP).
STATEMENT OF GOVERNMENTAL SUPPORT
 The invention described and claimed herein was made utilizing funds supplied by the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The government has certain rights in this invention.