The compound biological fluidized bed method, which combines biological fluidized bed and contact oxidation method, makes starch wastewater pass through fluidized biological carrier first and then through packing layer to treat wastewater from a starch factory in Beijing. The removal rate of COD is about 90%, and the wastewater can meet the standard. This method can complement the advantages and disadvantages of biological fluidized bed technology and contact oxidation method, and greatly improve the treatment efficiency.
Anaerobic fluidized bed is a reactor that maximizes the effective surface area of filler attached to microorganisms, and the filler occupies the smallest volume of the reaction tank, ensuring the maximum concentration of active microorganisms attached in the system. Both laboratory and pilot studies show that AFB can achieve a much higher load rate than other high-efficiency anaerobic reactors, while maintaining similar treatment effects. After pilot test in France 1 year, AFB was put into use, with the removal rates of BOD and COD reaching 53.3% and 72.2% respectively, and the loading rate reaching 35 kg (COD)/(m3 d). Zhou Jian et al. studied the treatment of sulfate straw pulp wastewater by granular activated carbon (GAC) carrier anaerobic fluidized bed reactor at the medium temperature of "(30℃ 2)", and completed the domestication of microorganisms, and on this basis, studied the performance of anaerobic fluidized bed treatment of sulfate straw pulp wastewater. When the influent COD concentration is 2000 ~ 5000mg/L and the hydraulic retention time is 3 ~ 9h, the COD removal rate is 50. 1% ~ 70.2%, the volumetric gas production is1.46 ~ 3.00 m3/(m3 d), and the organic volumetric load can reach 43.2 kg (.