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首页> 外文期刊>Journal of Environmental Health Science and Engineering >Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector
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Preliminary study on optimization of pH, oxidant and catalyst dose for high COD content: solar parabolic trough collector

机译：高COD含量优化pH，氧化剂和催化剂用量的初步研究：太阳能抛物槽收集器

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In the present study, solar photocatalytic oxidation has been investigated through laboratory experiments as an alternative to conventional secondary treatment for the organic content reduction of high COD wastewater. Experiments have been performed on synthetic high COD wastewater for solar photocatalytic oxidation using a parabolic trough reactor. Parameters affecting the oxidation of organics have been investigated. The experimental design followed the sequence of dark adsorption studies of organics, followed by photolytic studies (in absence of catalyst) and finally photocatalytic studies in presence and absence of additional oxidant (H2O2). All the experimental studies have been performed at pH values of 2, 4, 6,8,10 and the initial pH value of the wastewater (normal pH). For photocatalytic studies, TiO2 has been used as a photocatalyst. Optimization of catalyst dose, pH and H2O2 concentration has been done. Maximum reduction of organic content was observed at the normal pH value of the wastewater (pH?=?6.8). The reaction rate was significantly enhanced in presence of hydrogen peroxide. The optimum pH other than the Normal was in the alkaline range. Acidic pH was not found to be favourable for organic content reduction. pH was found to be a dominant factor affecting reaction rate even in presence of H2O2 as an additional oxidant. Also, the solar detoxification process was effective in treating a waste with a COD level of more than 7500 mg/L, which is a otherwise a difficult waste to treat. It can therefore be used as a treatment step in the high organic wastewater treatment during the primary stage also as it effectively reduces the COD content by 86%.
机译：在本研究中，已经通过实验室实验研究了太阳能光催化氧化，以作为传统的二次处理的替代方法，以减少高COD废水的有机物含量。已经使用抛物线槽反应器对合成的高COD废水进行了太阳能光催化氧化的实验。已经研究了影响有机物氧化的参数。实验设计遵循有机物的暗吸附研究的顺序，然后进行光解研究（在没有催化剂的情况下），最后在存在和不存在其他氧化剂（H2O2）的情况下进行光催化研究。所有实验研究都是在pH值为2、4、6、8、10和废水的初始pH值（正常pH）下进行的。对于光催化研究，TiO 2已被用作光催化剂。已经完成了催化剂剂量，pH和H2O2浓度的优化。在废水的正常pH值（pH≥6.8）下观察到最大的有机物减少。在过氧化氢的存在下，反应速率显着提高。除标准pH以外的最佳pH在碱性范围内。未发现酸性pH有利于有机物含量的降低。发现即使在过氧化氢作为附加氧化剂的存在下，pH值也是影响反应速率的主要因素。此外，太阳能解毒工艺可有效处理COD含量超过7500 mg / L的废物，否则这将是难以处理的废物。因此，它可以用作初级阶段高有机废水处理中的处理步骤，因为它可以有效地将COD含量降低86％。

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