Environmental Science and Engineering Division, CSIR-Central Leather Research Institute, Adyar, Chennai, 600 020, India.
Department of Chemistry, CEG Campus, Anna University, Chennai, 600 025, India.
Environ Geochem Health. 2021 Feb;43(2):885-896. doi: 10.1007/s10653-020-00570-x. Epub 2020 Apr 25.
A pilot-scale photocatalytic membrane bioreactor (PMBR) was developed for the treatment of textile dyeing wastewater. The PMBR is made of mild steel rectangular reactor of photocatalytic unit and polyethersulphone submerged hollow fibre membrane bioreactor unit with the working volume of about 20 L. For easy recovery, the tungsten oxide (WO) and WO/1% graphene oxide (GO)-powdered photocatalyst were made into bead and immersed in photocatalytic reactor. Graphene oxide incorporation has shown better results in decolourisation and degradation when compared with WO alginate alone. The incorporation of GO into WO minimises the recombination of photogenerated electron-hole pairs. The operating conditions such as 3 h of contact time for photocatalysis reaction (WO/1% GO), 10 h hydraulic retention time for MBR and 100 kPa of transmembrane pressure were optimised. Chemical oxygen demand removal efficiency of 48% was attained with photocatalysis, and the removal efficiency was further increased up to 76% when integrated with MBR. The colour removal efficiency after photocatalysis was 25% further increased up to 70% with MBR. Complete total suspended solid removal has been achieved with this hybrid system.
一个中试规模的光催化膜生物反应器（PMBR）被开发出来用于处理纺织印染废水。PMBR 由光催化单元的矩形温和钢反应器和聚醚砜浸没式中空纤维膜生物反应器单元组成，工作体积约为 20L。为了便于回收，将氧化钨（WO）和 WO/1%氧化石墨烯（GO）-粉末状光催化剂制成珠状并浸入光催化反应器中。与单独的 WO 藻酸盐相比，氧化石墨烯的加入在脱色和降解方面表现出更好的效果。GO 的加入最小化了光生电子-空穴对的复合。优化了操作条件，如光催化反应的 3 小时接触时间（WO/1%GO）、MBR 的 10 小时水力停留时间和 100kPa 的跨膜压力。通过光催化反应达到了 48%的化学需氧量去除效率，当与 MBR 集成时，去除效率进一步提高到 76%。光催化后的颜色去除效率从 25%进一步提高到 70%，采用 MBR。该混合系统实现了完全的总悬浮固体去除。
