NOVELTY - System (S1) (300) comprises: an industrial source producing a waste stream including a carbon oxide; and a bioreactor (305) including a first substrate comprising the waste stream, a second substrate comprising molecular hydrogen, and a liquid medium including a culture of a microorganism capable of chemoautotrophically capturing at least some of the carbon oxide in the first substrate.    USE - The systems are useful for chemoautotrophically converting carbon oxide in industrial waste to biomass and chemical products (claimed), where the chemical products comprise hydroxyalkanoate, polyhydroxyalkanoate e.g. hydroxybutyric acid and polyhydroxybutyric acid, heteropolymer having mixture of hydroxybutyrate and hydroxyvalerate, propanediol, octadecane-1,12-diol, carotenoid, fatty acid, fat, oil, alkane, 3-hydroxybutyrate monomer or hydroxybutyrate and hydroxyvalerate monomer, and the chemical products are transformed into biofuels comprising butanol, ketones, methyl ester, alkanes, biodiesel, fatty acids and polytrimethylene terephthalate.    ADVANTAGE - The systems provide biomass and/or chemicals in an economically viable, environmentally attractive, and sustainable manner.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) a system (S2) comprising a cement manufacturing facility (310) including a cement kiln (315) and an exhaust gas system (320) configured to capture the exhaust gas from the cement kiln, and a bioreactor system including a bioreactor in fluid communication with the exhaust gas system and configured to produce a chemical product from a carbon oxide in a first gaseous stream from the exhaust gas system, where the first gaseous stream includes the exhaust gas from the cement kiln; and    (2) a chemoautotrophic conversion of carbon oxide in industrial waste to biomass and chemical products, comprising providing a carbon oxide to a bioreactor, providing molecular hydrogen to the bioreactor, providing molecular oxygen to the bioreactor, and maintaining a culture of a chemoautotrophic microorganism in a growth medium in the bioreactor, where the microorganism is capable of chemoautotrophically capturing at least part of the carbon oxide to produce a chemical product.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of the system.    System (300)    Bioreactor (305)    Cement manufacturing facility (310)    Cement kiln (315)    Exhaust gas system (320)