Environmental Photocatalysis Research Laboratory (EPRL), Department of Ecology and Environmental Sciences, Pondicherry University , Pondicherry , India.
Environ Technol. 2019 Oct;40(24):3190-3199. doi: 10.1080/09593330.2018.1468486. Epub 2018 May 5.
Application of pilot-scale slurry-type tubular photocatalytic reactor was tested for the decentralized treatment of actual grey water. The reactors were fabricated by reusing the locally available materials at low cost, operated in batch recycle mode with 25 L of grey water. The influence of operational parameters such as catalysts' concentration, initial slurry pH and addition of HO on COD abatement were optimized. The results show that Ag-decorated TiO showed a two-fold increase in COD abatement than did pure TiO. Better COD abatement was observed under acidic conditions, and addition of HO significantly increases the rate of COD abatement. Within 2 h, 99% COD abatement was observed when the reactor was operated with optimum operational conditions. Silver ion lixiviate was also monitored during the experiment and is five times less than the permissible limits. The catalyst shows good stability even after five cycles without much loss in its photocatalytic activity. The results clearly reveal that pilot-scale slurry tubular solar photocatalytic reactors could be used as a cost-effective method to treat grey water and the resulting clean water could be reused for various non-potable purposes, thus conserving precious water resource. This study favours decentralized grey water treatment and possible scaling up of solar photocatalytic reactor using locally available materials for the potential reuse of treated water.
采用中试规模的浆态管式光催化反应器对实际灰水进行分散处理。该反应器由当地易得的材料低成本制造，以 25 L 灰水为处理对象，采用间歇循环模式运行。优化了操作参数（如催化剂浓度、初始泥浆 pH 值和 HO 的添加）对 COD 去除的影响。结果表明，与纯 TiO 相比，Ag 修饰的 TiO 使 COD 去除率提高了一倍。在酸性条件下观察到更好的 COD 去除效果，HO 的添加显著提高了 COD 去除率。在最佳操作条件下，反应器运行 2 h 后，COD 去除率达到 99%。在实验过程中还监测到银离子浸出，其含量比允许限值低五倍。即使经过五次循环，催化剂仍保持良好的稳定性，其光催化活性损失不大。研究结果清楚地表明，中试规模的浆态管式太阳能光催化反应器可作为一种经济有效的方法来处理灰水，所得清洁水可用于各种非饮用水用途，从而节约宝贵的水资源。本研究支持灰水的分散处理，并可使用当地易得的材料对太阳能光催化反应器进行放大，以实现处理水的潜在再利用。
