LINDa,ZHAOXun-xia,QINHui.Treatment of Industrial Park Wastewater by Modified Bardenpho, Ozone Oxidation and BAF Process[J].China Water & Wastewater,2022,38(14):89-92.
Treatment of Industrial Park Wastewater by Modified Bardenpho, Ozone Oxidation and BAF Process
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第14期
Page:
89-92
Column:
Date of publication:
2022-07-17
- Keywords:
- industrial park; hydrolytic acidification; modified Bardenpho; ozone contact oxidation; BAF; denitrification filter
- Abstract:
- In order to meet the level Ⅳ criteria except TN≤10 mg/L in Environmental Quality Standards for Surface Water (GB 3838-2002) for an industrial park wastewater treatment plant in Guangxi, the combined process of hydrolytic acidification, modified Bardenpho, ozone contact oxidation, biological aerated filter (BAF), denitrification filter and contact disinfection was used. Among them, the hydrolytic acidification tank adopts the pulse water distribution method with the hydraulic retention time of 8.1 h. The hydraulic retention time of modified Bardenpho is 24 h, the reflux ratio in the mixed liquid is 150% to 250%, the sludge retention time (SRT) is 15 d, and the liftable aeration system is adopted with the gas-water ratio of 9.6∶1. The surface load of the secondary sedimentation tank is 0.75 m3/(m2·h), and that of the high-efficiency sedimentation tank is 9.92 m3/(m2·h) with the total residence time of 60.5 min. The residence time of ozone contact tank is 60 min with the O3 dosing concentration of 20 mg/L. The hydraulic load of BAF is 3.04 m3/(m2·h), and the COD removal load is 1.46 kg/(m2·d). The normal filtration rate of denitrification filter is 5.76 m/h, and its mandatory filtration rate is 7.2 m/h. The residence time of contact disinfection is 30 min with the dosing sodium hypochlorite concentration of 8-10 mg/L. The actual effluent quality meets the design requirement.
Last Update:
2022-07-17