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Treatment of Ink Wastewater Via Heterogeneous Photocatalytic Oxidation

机译：非均相光催化氧化处理油墨废水

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摘要

Treatment of wastewater from an ink production plant provides the material of this study. The wastewater is highly contaminated with organic and inorganic matters. The chemical oxygen demand ranged from 9120 to 27458 mgO_2/l. The end-of-pipe has been treated using two alternatives namely, chemical coagulation using FeCl_3 aided with lime followed by photo-catalytic oxidation, while the second treatment alternative was a direct treatment via heterogeneous photo-catalytic oxidation using TiO_2/UV and H_2O_2. The optimum operating conditions required for photo-catalytic oxidation such as contact time, dose of H_2O_2 and TiO_2 were investigated. The results obtained indicated that the direct treatment of raw wastewater with photo-catalytic oxidation reduced the COD, TSS and turbidity by 81.4%, 95% and 90%, respectively. The corresponding residual values were 1700 mgO_2/l, 82 mg/l and 100 NTU. However, pretreatment of raw wastewater with chemical coagulation followed by photo-catalytic oxidation improved the quality of the effluent produced. Residual COD, TSS and turbidity were 420 mgO_2/l, 50 mg/l and 80 NTU, respectively. Also, complete removal of color was achieved. The quality of the treated effluent is complying with the National Regulating Standards for wastewater discharge into public municipal network.
机译：来自油墨生产厂的废水的处理提供了本研究的材料。废水被有机和无机物高度污染。化学需氧量为9120至27458 mgO_2 / l。管端已采用两种替代方法进行处理，即使用FeCl_3辅助石灰进行化学混凝，然后进行光催化氧化，而第二种处理方法是使用TiO_2 / UV和H_2O_2通过异质光催化氧化直接处理。研究了光催化氧化所需的最佳操作条件，如接触时间，H_2O_2和TiO_2的用量。结果表明，光催化氧化直接处理原废水可将COD，TSS和浊度分别降低81.4％，95％和90％。相应的残留值为1700 mgO_2 / l，82 mg / l和100 NTU。但是，通过化学混凝预处理前废水，然后进行光催化氧化，可以提高所产生废水的质量。残留COD，TSS和浊度分别为420 mgO_2 / l，50 mg / l和80 NTU。而且，完全去除了颜色。处理后的废水的质量符合将废水排入公共市政网络的国家法规标准。

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