Abstract: A fermentation method for recovering carboxylic acids while reducing greenhouse gas emissions includes: installing a fermentation device for recovering the carboxylic acids while reducing the greenhouse gas emissions on a ground close to a sewage treatment facility, where the fermentation device includes a fermentation container, and a sludge inlet assembly, a decanting assembly, a hydraulic circulation assembly, a heating and insulation assembly, an agitator assembly, a reagent regulation assembly, and a monitoring and electrical control assembly mounted on the fermentation container.

Abstract: A fermentation device for recovering carboxylic acids while reducing greenhouse gas emissions includes a fermentation container, a sludge inlet assembly, a decanting assembly, a hydraulic circulation assembly, a heating and insulation assembly, an agitator assembly, a reagent regulation assembly, and a monitoring and electrical control assembly. The fermentation device ferments all primary and excess sludge from a sewage treatment plant to recover the carboxylic acids. Through operation of the fermentation device and control of reaction parameters, a carboxylic acid mixture with a specific ratio is produced, thereby significantly reducing greenhouse gases such as methane produced during fermentation. The carboxylic acid mixture recovered is added to a biological reaction tank to achieve clean ultra-purification treatment of sewage and synergistic and efficient removal of the greenhouse gases.

Abstract: A catalytic oxidation reactor and a complete set of equipment are provided for water purification, the catalytic oxidation reactor includes a container, a reagent storage and delivery assembly and an ultraviolet lamp tube, the ultraviolet lamp tube is disposed in the container, and an annular gap cavity is defined between an inner wall of the container and an outer wall of the ultraviolet lamp tube; an outlet of the reagent storage and delivery assembly is disposed in the annular gap cavity, and the reagent storage and delivery assembly is configured to deliver the at least one oxidant to the annular gap cavity. Under the influence of ultraviolet photocatalysis, active free radicals are generated. Both the oxidant and these active free radicals flow out through multiple micro-holes situated on the sidewall of the container into a water body, serving to purify and disinfect it effectively.