The Optimization Parameters and Performance of Biological Aerated Filter with Sludge-glass Ceramic Particles as Biofilter for Dairy Wastewater Treatment

Sludge-glass ceramic particles were used as filter media for single biological aerated filter (BAF) to treat dairy wastewater in this study. Seed sludge was inoculated from Zhengzhou Wulongkou wastewater treatment plant. When bio-film was promoted and the effluent contamination removal rates above 40% after one week's operation, started to optimize the operation parameters such as pH, hydraulic retention time (HRT) and influent load, taking COD, NH4+-N, TN as well as TP removal rate as standards. The result indicated that the best removal efficiency of contaminations in effluent was under the conditions of pH 7-8, HRT 8h, COD 2055 mg/L and NH4+-N 70mg/L. And the effluent COD was about 80-90 mg/L, NH4+-N 7-10mg/L, which had already reached the desired standards. Simultaneously, it obviously showed that single-BAF was an ideal technology for dairy wastewater treatment, regardless of high COD concentration above 2000mg/L.