Abstract: A biogas treatment process is integrated with a water treatment process to adjust the pH level of the water and to provide more effective disinfection of the water. A water wash process is utilized to separate methane and carbon dioxide present in the biogas. During the water wash process, the biogas is mixed with water and the carbon dioxide is absorbed into the water. Because the process typically occurs at an elevated pressure and reduced temperature to enhance the solubility of carbon dioxide in water, the water stream becomes supersaturated with carbon dioxide. This water stream, which is supersaturated with carbon dioxide, is provided to the water treatment process to adjust the pH level of the water treatment process. The pH level is regulated to a desired level such that an increased relative concentration of hypochlorous acid is produced when sodium hypochlorite is added to the treatment process.

Abstract: A biogas treatment process is integrated with a water treatment process to adjust the pH level of the water and to provide more effective disinfection of the water. A water wash process is utilized to separate methane and carbon dioxide present in the biogas. During the water wash process, the biogas is mixed with water and the carbon dioxide is absorbed into the water. Because the process typically occurs at an elevated pressure and reduced temperature to enhance the solubility of carbon dioxide in water, the water stream becomes supersaturated with carbon dioxide. This water stream, which is supersaturated with carbon dioxide, is provided to the water treatment process to adjust the pH level of the water treatment process. The pH level is regulated to a desired level such that an increased relative concentration of hypochlorous acid is produced when sodium hypochlorite is added to the treatment process.

Abstract: A biogas treatment process is integrated with a water treatment process to adjust the pH level of the water and to provide more effective disinfection of the water. A water wash process is utilized to separate methane and carbon dioxide present in the biogas. During the water wash process, the biogas is mixed with water and the carbon dioxide is absorbed into the water. Because the process typically occurs at an elevated pressure and reduced temperature to enhance the solubility of carbon dioxide in water, the water stream becomes supersaturated with carbon dioxide. This water stream, which is supersaturated with carbon dioxide, is provided to the water treatment process to adjust the pH level of the water treatment process. The pH level is regulated to a desired level such that an increased relative concentration of hypochlorous acid is produced when sodium hypochlorite is added to the treatment process.

Abstract: Multiple risers are provided to perform different steps in a biogas water wash process. The risers may include absorption risers, flashing risers, and stripping risers. In each riser, the inlets to provide fluids to the riser and outlets to remove fluids from the risers are provided at one end of the riser. Each riser may then be located substantially below grade such that the end with the inlets and outlets is accessible at or just above the ground level. The risers within each step of the water wash process may be connected in series, parallel, or a combination thereof. The risers may also be constructed of a polyethylene material to reduce cost and weight of the water wash system.

Abstract: A biogas treatment process is integrated with a water treatment process to adjust the pH level of the water and to provide more effective disinfection of the water. A water wash process is utilized to separate methane and carbon dioxide present in the biogas. During the water wash process, the biogas is mixed with water and the carbon dioxide is absorbed into the water. Because the process typically occurs at an elevated pressure and reduced temperature to enhance the solubility of carbon dioxide in water, the water stream becomes supersaturated with carbon dioxide. This water stream, which is supersaturated with carbon dioxide, is provided to the water treatment process to adjust the pH level of the water treatment process. The pH level is regulated to a desired level such that an increased relative concentration of hypochlorous acid is produced when sodium hypochlorite is added to the treatment process.

Abstract: Multiple risers are provided to perform different steps in a biogas water wash process. The risers may include absorption risers, flashing risers, and stripping risers. In each riser, the inlets to provide fluids to the riser and outlets to remove fluids from the risers are provided at one end of the riser. Each riser may then be located substantially below grade such that the end with the inlets and outlets is accessible at or just above the ground level. The risers within each step of the water wash process may be connected in series, parallel, or a combination thereof. The risers may also be constructed of a polyethylene material to reduce cost and weight of the water wash system.

Abstract: Multiple risers are provided to perform different steps in a biogas water wash process. The risers may include absorption risers, flashing risers, and stripping risers. In each riser, the inlets to provide fluids to the riser and outlets to remove fluids from the risers are provided at one end of the riser. Each riser may then be located substantially below grade such that the end with the inlets and outlets is accessible at or just above the ground level. The risers within each step of the water wash process may be connected in series, parallel, or a combination thereof. The risers may also be constructed of a polyethylene material to reduce cost and weight of the water wash system.

Abstract: Multiple risers are provided to perform different steps in a biogas water wash process. The risers may include absorption risers, flashing risers, and stripping risers. In each riser, the inlets to provide fluids to the riser and outlets to remove fluids from the risers are provided at one end of the riser. Each riser may then be located substantially below grade such that the end with the inlets and outlets is accessible at or just above the ground level. The risers within each step of the water wash process may be connected in series, parallel, or a combination thereof. The risers may also be constructed of a polyethylene material to reduce cost and weight of the water wash system.

Abstract: A case for a portable electronic device includes a shell having an interface aperture and a circular channel within a rear surface. The case further includes a disc captured within the circular channel, wherein the disc has a strap exposed on a surface proximate to the rear surface. Alternatively, the case includes sleeve portions that have apertures on front planar surfaces and semicircular channels on corresponding rear surfaces. The sleeve portions are adapted to mate at a connection interface wherein the semicircular channels collectively form a circular channel. The case optionally includes ridges that protrude from the rear surfaces and optionally includes one or more retractable legs that enable support of the case in at least one of a landscape orientation and a portrait orientation.