Diez M C, Pouleurs D, Navia R, Vidal G
Chemical Engineering Department, University of La Frontera, P.O. Box 54-D, Temuco, Chile.
Water Res. 2005 Sep;39(14):3239-46. doi: 10.1016/j.watres.2005.05.046.
The effect of ethylenediaminetetracetic acid (EDTA) and Fe-EDTA complex on synthetic totally chlorine-free (TCF) effluent degradability in batch and continuously operating reactors was evaluated. Under batch treatment, the addition of EDTA and Fe-EDTA complex was studied in the range of 80 to 320 mg l(-1). Under continuously operated reactors, the Fe-EDTA complex concentration varied from 20 to 80 mg l(-1), and the hydraulic retention time (HRT) varied from 48 to 24 h. Sludge oxygen uptake rate (OUR) and chemical oxygen demand (COD) removal decreased when EDTA concentration increased in the influent under batch treatment; however, this inhibitory effect was reduced by the addition of Fe-EDTA complex. Without the addition of EDTA, COD removal decreased from 71% to 8%. The most efficient EDTA removal treatment (almost 10%) was the treatment of 80 mg l(-1) Fe-EDTA. Under continuously operated reactors, COD removal was greater than 57% in the synthetic TCF effluent with a Fe-EDTA concentration that varied from 20 to 80 mg l(-1); however, EDTA removal was lower than 25% in all cases. Synthetic TCF effluent with a Fe -EDTA concentration higher than 80 mg l(-1) could not be treated by the activated sludge treatment due to EDTA's inhibitory effect on the sludge.
评估了乙二胺四乙酸（EDTA）和Fe-EDTA络合物对间歇式和连续运行反应器中合成全氯（TCF）废水可降解性的影响。在间歇处理条件下，研究了EDTA和Fe-EDTA络合物在80至320 mg l(-1)范围内的添加情况。在连续运行的反应器中，Fe-EDTA络合物浓度在20至80 mg l(-1)之间变化，水力停留时间（HRT）在48至24小时之间变化。在间歇处理中，当进水EDTA浓度增加时，污泥耗氧速率（OUR）和化学需氧量（COD）去除率降低；然而，添加Fe-EDTA络合物可减轻这种抑制作用。不添加EDTA时，COD去除率从71%降至8%。最有效的EDTA去除处理（几乎10%）是80 mg l(-1) Fe-EDTA的处理。在连续运行的反应器中，Fe-EDTA浓度在20至80 mg l(-1)之间的合成TCF废水中，COD去除率大于57%；然而，在所有情况下，EDTA去除率均低于25%。由于EDTA对污泥的抑制作用，Fe -EDTA浓度高于80 mg l(-1)的合成TCF废水无法通过活性污泥处理。
