Environmental Photocatalysis Research Laboratory, Department of Ecology and Environmental Sciences, Pondicherry University, Pondicherry, 605014, India.
Environ Sci Pollut Res Int. 2016 Sep;23(17):17730-41. doi: 10.1007/s11356-016-6964-y. Epub 2016 Jun 1.
Pilot scale thin film plate reactors (TFPR) were fabricated to study the solar photocatalytic treatment of wastewater obtained from the secondary treatment plant of a sugar refinery. Silver-impregnated titanium dioxide (TiO2) was prepared by a facile chemical reduction method, characterized, and immobilized onto the surface of ceramic tiles used in the pilot scale reactors. On 8 h of solar irradiation, percentage reduction of chemical oxygen demand (COD) of the wastewater by Ag/TiO2, pure TiO2, and control (without catalyst) TFPR was about 95, 86, and 22 % respectively. The effects of operational parameters such as, flow rate, pH, and addition of hydrogen peroxide (H2O2) were optimized as they influence the rate of COD reduction. Under 3 h of solar irradiation, 99 % COD reduction was observed at an optimum flow rate of 15 L h(-1), initial pH of 2, and addition of 5 mM of H2O2. The results show that Ag/TiO2 TFPR could be effectively used for the tertiary treatment of sugar refinery effluent using sunlight as the energy source. The treated water could be reused for industrial purposes, thus reducing the water footprint of the industry. Graphical Abstract Sugar refinery effluent treatment by solar photocatalytic TFPR.
中试规模的薄膜板式反应器（TFPR）被用于研究从糖厂二级处理厂获得的废水的太阳能光催化处理。通过简便的化学还原法制备了负载银的二氧化钛（TiO2），对其进行了表征，并将其固定在中试规模反应器中使用的瓷砖表面。在 8 小时的太阳照射下，Ag/TiO2、纯 TiO2 和对照（无催化剂）TFPR 对废水的化学需氧量（COD）的去除率分别约为 95%、86%和 22%。操作参数如流速、pH 值和过氧化氢（H2O2）的添加等的影响被优化，因为它们会影响 COD 还原的速率。在 3 小时的太阳照射下，在最佳流速为 15 L/h、初始 pH 值为 2 和添加 5 mM H2O2 的条件下，观察到 99%的 COD 去除率。结果表明，Ag/TiO2 TFPR 可有效地用于使用阳光作为能源对糖厂废水进行三级处理。处理后的水可用于工业用途，从而减少该行业的水足迹。
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