This study was conducted to evaluate the treatment performance of the anoxic–oxic–anoxic processes in illuminated biofilm reactor (AOA-IBR) in removing organics and nitrogen contained in septic tank effluent. The 27 L of the AOA-IBR was illuminated with red light-emitting diode (LED) lamps (peak wavelength of 635 nm, intensity of 100 μmol/(m²s)). Three types of biofilm media, namely ball ring^®, plastic sheets and zeolite beads, were placed in the anoxic, oxic and anoxic zones, respectively, of the reactor to support the growth of microalgal–bacterial biofilm. The AOA-IBR was continuously fed with septic tank effluent and operated at hydraulic retention times (HRTs) of 24, 48 and 72 h. The experimental results found the increases in chemical oxygen demand (COD), total nitrogen (TN) and ammonia nitrogen (NH₄-N) removal efficiencies with increasing HRTs in which the HRT of 72 h resulted in 78.6, 72.8 and 90.6% removals of COD, TN and NH₄-N, respectively. The effluent quality of the AOA-IBR could meet the ISO 30500 effluent standards for Non-Sewered Sanitation Systems. The predominant microalgal biofilm species was observed to be Oscillatoria sp., while Proteobacteria was the predominant bacterial phylum found in the biofilm growing in the reactor. The above results suggested the applicability of the AOA-IBR in improving septic tank treatment performance which should result in better water pollution control.

这项研究的目的是评估照明生物膜反应器（AOA-IBR）中的缺氧-缺氧-缺氧过程在去除化粪池废水中所含有机物和氮方面的处理性能。用红色发光二极管（LED）灯（峰值波长为635 nm，强度为100μmol/（m ² s））照亮27 L的AOA-IBR 。三种类型的生物膜介质，即球形环^®分别将塑料片和沸石珠放在反应器的缺氧，缺氧和缺氧区域，以支持微藻-细菌生物膜的生长。向AOA-IBR连续注入化粪池废水，并在24、48和72小时的水力停留时间（HRT）下运行。实验结果发现，随着HRT的增加，化学需氧量（COD），总氮（TN）和氨氮（NH ₄ -N）的去除效率增加，其中72 h的HRT去除了78.6、72.8和90.6％的HRT。分别为COD，TN和NH ₄ -N。AOA-IBR的出水质量可以满足非下水道卫生系统的ISO 30500出水标准。观察到主要的微藻生物膜物种是颤藻例如，Proteobacteria是在反应器中生长的生物膜中发现的主要细菌门。以上结果表明，AOA-IBR在改善化粪池处理性能方面的适用性，应能更好地控制水污染。