Tomei M Concetta, Annesini M Cristina, Luberti Roberta, Cento Giorgia, Senia Alessandro
Istituto di Ricerca sulle Acque, Consiglio Nazionale delle Ricerche, Via Reno 1, 00198, Roma, Italy.
Water Res. 2003 Sep;37(16):3803-14. doi: 10.1016/S0043-1354(03)00297-5.
In this paper, the biodegradation process of 4-nitrophenol (4NP) in a sequencing batch reactor has been investigated. Kinetic tests have been carried out on biomass grown on mixed substrate (4NP plus biogenic substrate) both in the presence of a biogenic substrate fraction in the feed and with 4NP as the sole carbon source. Removal kinetics for all tests is well described by the typical substrate inhibition pattern as predicted by the Haldane equation. In both sets, estimated kinetic parameters are very similar: no beneficial effect of the biogenic fraction is observed on the 4NP removal while increasing trend of 4NP maximum removal rate with the 4NP/COD(TOT) ratio in the feed has been observed. This finding has been modelled by estimating the fraction of the total biomass involved in 4NP biodegradation as a function of 4NP concentration in the feed. High removal rates, short acclimation times and good settling characteristics of produced sludge (observed during the whole working period) confirm the suitability of periodic systems in enhancing the bacterial potentialities for biodegradation of xenobiotic compounds.
本文研究了序批式反应器中4-硝基苯酚（4NP）的生物降解过程。对在混合底物（4NP加生源底物）上生长的生物质进行了动力学测试，测试条件包括进料中存在生源底物组分以及以4NP作为唯一碳源的情况。所有测试的去除动力学均符合由哈尔丹方程预测的典型底物抑制模式。在这两组测试中，估算的动力学参数非常相似：未观察到生源组分对4NP去除有有益影响，而进料中4NP/化学需氧量（总）（4NP/COD(TOT)）比值增加时，4NP最大去除率呈上升趋势。通过估算进料中4NP浓度的函数来模拟参与4NP生物降解的总生物量的比例，从而对这一发现进行了建模。高去除率、短驯化时间以及所产生污泥良好的沉降特性（在整个运行期间均观察到）证实了周期性系统在增强细菌对异生物质化合物生物降解潜力方面的适用性。
