膜生物反应器处理酱油废水的中试研究

PILOT STUDY ON SAUCE WASTWATER TREATMENT WITH MBR

采用一体式好氧膜生物反应器(MBR)工艺处理实际酱油废水。考察了MBR对酱油废水的处理效果,并讨论了工艺参数对处理效果的影响。进水采用广东某酱油厂综合废水处理工艺的厌氧池出水,COD 500～800 mg.L-1、氨氮质量浓度为200 mg.L-1左右、色度为600～700倍、浊度为100 NTU左右。运行工艺参数:水温≥20℃、DO质量浓度≥2.5 mg.L-1、MLSS为8 000 mg.L-1、水力停留时间48 h、污泥停留时间120 d。试验结果表明,在系统稳定运行后,使用膜生物反应器工艺处理酱油废水能达到良好的效果。出水COD、氨氮、色度分别为:≤90 mg.L-1、≤10mg.L-1、40倍左右,平均去除率分别为87.8%、95.94%、93.8%。对浊度的去除率能达到99%,出水水质稳定。

he treatment of sauce wastwater with a submerged MBR was conducted in a pilot study.The raw wastewater,which was taken from the anaerobic tank effluent of the wastewater treatment plant in a sauce factory in Guangdong,was characterized by COD as 500～800 mg·L-1,NH4＋-N as about 200 mg·L-1,chroma as 600～700 times,turbidity as about 100 NTU.The operating parameters were optimized as temperature higher than 20 ℃,DO larger than 2.5 mg·L-1,MLSS of 8000 mg·L-1,、HRT of 48 h、sludge retention time of 120 d.Once the MBR run stably,the effluent can meet the standards of DB 4426-2005 as COD ≤90 mg·L-1,NH4＋-N ≤10 mg·L-1 and chroma ≤40 times,and the average removal rates of the three indexes can reach to 87.8%,95.94%,93.8% respectively.Moreover,the removal rate of turbidity can exceed 99%.The experiment indicated that MBR could be used for treating sauce wastewater ideally.