Combined technology of SDS-CuO/TiO2 photocatalysis and sequencing batch reactor(SBR) were applied to treating dyestuff wastewater.Photocatalysis was carried out in a spiral up-flow type reactor as pre-treatment.SDS-Cu...Combined technology of SDS-CuO/TiO2 photocatalysis and sequencing batch reactor(SBR) were applied to treating dyestuff wastewater.Photocatalysis was carried out in a spiral up-flow type reactor as pre-treatment.SDS-CuO/TiO2 photocatalyst was prepared by modification of nano-TiO2 using CuO and sodium dodecyl sulfate(SDS).Results show that the SDS-CuO/TiO2 photocatalyst contains two kinds of crystals,including TiO2 and CuO.The band gap of this photocatalyst is 1.56 eV,indicating that it can be excited by visible light(λ<794.87 nm).And characterization also shows that there are alkyl groups on its surface.It takes 40 min to improve the biodegradability of dyestuff wastewater.Five-day biochemical oxygen demand(BOD5) and dehydrogenase activity(DHA) of wastewater reach the maximum value when dissolved oxygen is higher than 2.97 mg/L.SBR reactor was used to treat this biodegradability improved wastewater.Chemical oxygen demand(COD) and colority decline to 72 mg/L and 20 times,respectively,when the sludge loading is 0.179 kg(COD)/[kg(MLSS)?d],dissolved oxygen is 4.09 mg/L and aeration time is 10 h.展开更多
基金Project(CDJZR11210009) supported by the Fundamental Research Funds for the Central Universities of China
文摘Combined technology of SDS-CuO/TiO2 photocatalysis and sequencing batch reactor(SBR) were applied to treating dyestuff wastewater.Photocatalysis was carried out in a spiral up-flow type reactor as pre-treatment.SDS-CuO/TiO2 photocatalyst was prepared by modification of nano-TiO2 using CuO and sodium dodecyl sulfate(SDS).Results show that the SDS-CuO/TiO2 photocatalyst contains two kinds of crystals,including TiO2 and CuO.The band gap of this photocatalyst is 1.56 eV,indicating that it can be excited by visible light(λ<794.87 nm).And characterization also shows that there are alkyl groups on its surface.It takes 40 min to improve the biodegradability of dyestuff wastewater.Five-day biochemical oxygen demand(BOD5) and dehydrogenase activity(DHA) of wastewater reach the maximum value when dissolved oxygen is higher than 2.97 mg/L.SBR reactor was used to treat this biodegradability improved wastewater.Chemical oxygen demand(COD) and colority decline to 72 mg/L and 20 times,respectively,when the sludge loading is 0.179 kg(COD)/[kg(MLSS)?d],dissolved oxygen is 4.09 mg/L and aeration time is 10 h.
