The present invention provides a joint method of cultivating microalgae combined with denitrating an industrial waste gas and a system useful for the same. The joint method comprises the steps of: (1) a step of cultivating microalgae; (2) a separation step of separating a microalgae suspension obtained from step (1) into a wet microalgae (microalgae biomass) and a residual cultivation solution; (3) a NOx absorbing/immobilizing step of denitrating an industrial waste gas with the residual cultivation solution obtained from step (2); wherein the nutrient stream absorbed with NOx obtained from step (3) is used to provide nitrogen source to the microalgae cultivation of step (1). During the microalgae cultivation, EM bacteria is added into the microalgae suspension. The microalgae is preferably Chlorella sp., Scenedesmus sp., Monoraphidium sp. or Spirulina sp.

Methods and systems to achieve clean fuel processing systems in which carbon dioxide emissions (1) from sources (2) may be processed in at least one processing reactor (4) containing a plurality of chemoautotrophic bacteria (5) which can convert the carbon dioxide emissions into biomass (6) which may then be used for various products (21) such as biofuels, fertilizer, feedstock, or the like. Sulfate reducing bacteria (13) may be used to supply sulfur containing compounds to the chemoautotrophic bacteria (5).

Described herein are methods and systems for processing gas streams. The gas streams may comprise a methane-containing gas stream, such as an exhaust stream. The systems and methods of the present disclosure may process the methane-containing gas stream using one or more processing units including a biological filtration unit and a thermal oxidizer to generate an output stream which has a lower concentration of methane than the methane-containing gas stream.

A system for removing undesirable compounds from contaminated air includes a biofilter having sintered glass media. Hydrogen sulfide is removed from contaminated air by passing the contaminated air through the biofilter.

The present invention relates to a carbon dioxide conversion process and, more particularly, to a continuous carbon dioxide conversion process and a system therefor.

The invention includes systems, methods, compositions, and processes for designing, manufacturing, and utilizing carbon dioxide-sequestering substrates that can fully or partially replace natural sand in coastal engineering applications. These engineered substrates can offset demand for scarce native sand resources, while also effecting the conversion of gaseous carbon dioxide to dissolved or solid-phase products thereby offsetting impacts of anthropogenic climate change.

The present invention relates to the field of air purification of indoor and/or domestic environments and has as its object a method for air purification and simultaneous photo-conversion of carbon dioxide to oxygen by exploiting a photosynthesis process of an algal culture comprised within an aqueous medium. The method according to the present invention therefore allows to purify the air of an indoor environment by abatement/solubilization of pollutants in the aqueous medium and reduction of CO.sub.2 contraction by photo-conversion into O.sub.2. The method according to the present invention further comprises the steps of illuminating and aerating said aqueous medium as well as a step of periodically maintaining said algal culture in a state of constant growth in order to optimize the photosynthesis of the algal culture.

Provided is a method for treatment of gas mixtures and an apparatus for carrying out a method for treatment of raw gas mixtures. More particularly, there is provided a method and an apparatus for treatment of gas mixtures, such as biogas or flare gas, and in particular to a method and an apparatus for removing contaminants, in particular H.sub.2S, from a gas mixture containing CH.sub.4 and H.sub.2S.

Disclosed are examples of luminaires that provide light for general illumination and treat air via a biofilter. In the examples, a luminaire may include a light source configured to illuminate a space, a biofilter configured to treat air, and an air circulation system. The light source may be configured to illuminate a space in which the luminaire is located with general illumination light. The biofilter may include an air permeable membrane, a substrate, and a microorganism that treats air that comes in contact with the microorganism. The air circulation system is configured to draw air into contact with the biofilter and output air treated by contact with the biofilter into at least a portion of the space illuminated by the light source.

The present invention relates to climate change and provides mitigation methods with capacities to capture gigatons of carbon dioxide through its efficient, low tech and low-cost deployment. Widespread deployment not only has the potential to create a carbon neutral environment but could eventually reverse climate change to pre-industrial levels within a decade. This invention is carbon negative in both production and deployment. i.e., it entirely offsets energy costs of production, transportation, and deployment. The product itself does not produce any CO.sub.2 emissions and its whole purpose is to capture CO.sub.2 from the atmosphere.