State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, No. 73 Huanghe Road, Harbin 150090, PR China.
Bioresour Technol. 2013 Aug;142:688-92. doi: 10.1016/j.biortech.2013.05.007. Epub 2013 May 23.
Azo dye is widely used in printing and dyeing process as one of refractory wastewaters for its high chroma, stable chemical property and toxicity for aquatic organism. Biocatalyzed electrolysis system (BES) is a new developed technology to degrade organic waste in bioanode and recover recalcitrant contaminants in cathode with effective decoloration. The ion exchange membrane (IEM) separate anode and cathode for biofilm formation protection. Azo removal efficiency was up to 60.8%, but decreased to 20.5% when IEM was removed. However, expensive ion exchange membrane (IEM) not suitable for further practical application, bioelectrochemical activity of bioanode is sensitive to the toxicity of azo dye. A gradient increase of azo dye concentration was used to acclimate anode biofilm to pollutant toxicity. The azo removal efficiency can be enhanced to 73.3% in 10h reaction period after acclimation. The highest removal efficiency reached 83.7% and removal rates were increased to 8.37 from 3.04 g/h/L of dual-chamber. That indicated the feasibility for azo dye removal by single-chamber BES. The IEM cancellation not only decreased the internal resistance, but increased the current density and azo dye removal.
偶氮染料因其高色度、化学稳定性和对水生生物的毒性，被广泛应用于印染过程中，属于难处理废水之一。生物催化电解系统（BES）是一种新兴的技术，可在生物阳极降解有机废物，并在阴极回收难降解污染物，同时具有有效的脱色效果。离子交换膜（IEM）将阳极和阴极隔开，以保护生物膜的形成。偶氮去除效率可达 60.8%，但当去除 IEM 时，去除效率降至 20.5%。然而，昂贵的离子交换膜（IEM）不适合进一步的实际应用，生物阳极的生物电化学活性对偶氮染料的毒性敏感。采用偶氮染料浓度梯度递增的方法，使阳极生物膜适应污染物毒性。驯化后，10h 反应周期内偶氮去除效率可提高至 73.3%。最高去除效率达到 83.7%，去除速率从双室的 3.04g/h/L 提高到 8.37g/h/L。这表明单室 BES 去除偶氮染料具有可行性。取消 IEM 不仅降低了内阻，还提高了电流密度和偶氮染料的去除率。
