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Tongxiang, China

Yu B.,Yangtze University | Liu R.,Yangtze University | Cheng J.-D.,Yangtze University | Cheng J.-D.,Tongxiang Environmental Protection Agency | And 6 more authors.
Huanjing Kexue/Environmental Science | Year: 2013

A pilot-scale hybrid process of ozone and biological aerated filters (BAF) with the capacity of 36 t·d-1 was applied for advanced treatment of the secondary biologically effluent from a dyeing and tannery park wastewater treatment plant. The pollutants removal performance along the height of different medias BAFs were investigated. The results showed that the average COD and color were 55.4 mg·L-1 and 12.6 times at the height of 1500 mm in activated carbon BAF, and were 55.6 mg·L-1 and 9.4 times at the height of 1800 mm in composite BAF, both of the effluent at each height met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Along the height of ceramist BAF, the COD and color were seldom removed. In activated carbon BAF and composite BAF, COD and ammonia nitrogen were both greatly decreased at the height of 1200 mm, then decreased slowly. The biomasses simultaneously reached the maximum at the height of 900 mm in activated carbon, composite and ceramist BAF, with the maxims of 30.69, 28.87 and 15.94 nmol·g-1, respectively. Source


Yu B.,Tsinghua University | Liu R.,Tsinghua University | Cheng J.,Tsinghua University | Fan J.,Tsinghua University | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2013

A pilot-scale hybrid process of ozone and biological aerated filters (BAF) with the capacity of 36~120 t/d was applied for advanced treatment of the secondary biologically effluent from a dyeing and tannery park wastewater treatment plant. Ozone pretreatment was optimized, then the effect of pollutants removal performance with ozone and different medias BAF was investigated. The results showed that the best treatment efficiency and economical conditions were ozone dosage of 25 mg/L, three dosing points of 6:3:1 and contact time of 42 min; the effluent COD and color of ozone-biological activated carbon (O3-BAC) were stabled at 50 mg/L and 5 times under the best conditions. The effluent met the first level B criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002). The effluent of ozone-composite BAF just met the first level B criteria specified, but neither COD nor color in the effluent of ozone-ceramist BAF can meet the first level B criteria specified. Source

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