The development of dissolved air flotation has gone through the exploration stage in the 20th century, the technological maturity stage in the 1940s and 1950s, the technology application and promotion period after the 1960s, and the technological innovation and optimization period in the 21st century. The development of dissolved air flotation products has evolved from early diffuse air flotation to electrolytic air flotation to impeller air flotation and high-pressure dissolved air flotation. Looking forward to the future, dissolved air flotation will develop rapidly with the support of artificial intelligence and big data technology.
This case study introduces the Tarim Ethylene Ethane Project of Dushanzi Petrochemical. The treatment of ethylene waste alkali liquid used the high-efficiency dissolved air flotation produced by our factory as a pretreatment to remove the oil substances entrained in the waste alkali liquid, and good results were achieved.
This project case introduces that the wastewater discharged by HANGZHOU ELECTROCHEMICAL NEW MATERIAL CO., LTD. during the production of PVC raw materials also contains a small amount of PVC fine particles. After the wastewater is pH-adjusted, coagulated, and flocculated, the fine particles are aggregated into larger flocs and recycled using high-efficiency dissolved air flotation, achieving good results.
In this case, Jiangsu Fengmang Compound Material sewage treatment project, we used the high-efficiency dissolved air flotation produced by our factory to remove most of the suspended impurities, and the effluent was sent to biochemical treatment, achieving good results.
The organic wastewater generated during the preparation and treatment of PCB circuit boards contains a lot of nickel. The chemical precipitation method balances the water quality and quantity of the nickel-containing wastewater, then passes through a pH adjustment tank with a pH value of about 3~4. Fenton reagent is added to the oxidation tank to convert the hypophosphite in the nickel-containing wastewater into orthophosphate to complete the wastewater decomposition. The wastewater is then introduced into an alkalization tank, and an aqueous solution of calcium hydroxide is added to generate nickel hydroxide and calcium phosphate precipitates. A polymer flocculant is added, and precipitation is carried out using a high-efficiency inclined plate sedimentation tank.
The Hangzhou Nbond Nonwovens Co., Ltd project uses high-efficiency dissolved air flotation produced by our company for pretreatment to reduce the content of organic matter and suspended matter in the landfill leachate. After air flotation pretreatment, the suspended matter concentration removal rate reaches over 90%. The grease removal rate reaches over 95%, significantly reducing the burden of subsequent biochemical treatment.
