The dissolved air flotation (DAF) unit adopts a new and efficient air dissolution device—the micro-bubble generator—to replace traditional air induction equipment for dissolving air into water. In the flotation zone, several inclined tube sets are installed, which, together with the tank body, scum scraper, and spiral discharger, form a complete air flotation water purification system. Theoretically, the treatment efficiency of flotation is not directly related to retention time but only to the flotation area. If the water depth H of the flotation zone is reduced to H/10, both the flotation distance and retention time are reduced by a factor of 10. This is the renowned "shallow tank theory." The purpose of adding inclined tubes in the flotation zone is to increase the flotation area, significantly reduce the Reynolds number, prevent turbulent flow during flotation, create favorable laminar flow conditions, and achieve the effect of shallow layer flotation.

Similarly, when the density of suspended solids is greater than 1, the installation of inclined tube sets creates a shallow tank sedimentation effect, allowing sedimentation to occur under turbulent conditions. Larger particles and pollutants with higher specific gravity that are difficult to float will concentrate in the sludge collection zone, achieving the goal of water purification.

Shandong Zhongkun Lanyuan Environmental Protection Equipment Co., Ltd. is a new environmental protection company established in May 2016. Located in Zhucheng City, a top 100 county in China and the hometown of Emperor Shun in Shandong Province, it is an environmental protection equipment machining center registered with the Zhucheng Administration for Industry and Commerce. The company specializes in the research, development, production, automated design, and sheet metal processing of sewage and waste gas treatment equipment. It possesses comprehensive capabilities for the installation and construction of sewage and waste gas treatment systems.