Gabaldón Carmen, Izquierdo Marta, Martínez-Soria Vicente, Marzal Paula, Penya-Roja Josep-Manuel, Javier Alvarez-Hornos F
Department of Chemical Engineering, University of Valencia, Dr. Moliner, 50, 46100 Burjassot, Spain.
J Hazard Mater. 2007 Sep 5;148(1-2):485-90. doi: 10.1016/j.jhazmat.2007.02.071. Epub 2007 Mar 3.
An upflow packed bed reactor at laboratory scale has been operated for a continuous period of 5 months to investigate the technical feasibility of biological nitrate removal applied to the effluent of the coagulation-sedimentation wastewater of a metal-finishing industry. The reactor was fed with industrial wastewater in a five-fold dilution to reproduce the global spill in the factory (20/80, industrial wastewater/domestic wastewater) with a concentration of nitrate between 141 and 210 gNO(3)-N/m(3). Methanol was added as a carbon source for denitrification. Inlet flow rate was progressively increased from 9 to 40 L/day (nitrogen input load from 45 to 250 gNO(3)-N/(m(3)h)). The highest observed denitrification rate was 135 gNO(3)-N/(m(3)h) at a nitrate load of 250 gNO(3)-N/(m(3)h), and removal efficiencies higher than 90% were obtained for loads up to 100 gNO(3)-N/(m(3)h). A mass relation between COD consumed and NO(3)-N removed around 3.31 was observed. Better results were achieved in a previous stage using tap water with nitrate added as a sole pollutant as a synthetic feed (critical load of 130 gNO(3)-N/(m(3)h) and denitrification rate of 200 gNO(3)-N/(m(3)h) at a nitrate load of 250 gNO(3)-N/(m(3)h)). This fact could indicate that the chemical composition of the industrial source hinders to some extent the performance of the biological process. Whatever case, results demonstrated the viability of the denitrification process for the global industrial wastewater. A simple model based on Monod kinetics for substrate consumption, and constant biomass concentration was applied to model the industrial wastewater treatment, and a reasonably good fitting was obtained.
实验室规模的上流式填充床反应器已连续运行5个月，以研究将生物脱氮应用于金属表面处理行业混凝沉淀废水的技术可行性。该反应器以五倍稀释的工业废水为进水，以模拟工厂中的整体泄漏情况（20/80，工业废水/生活污水），硝酸盐浓度在141至210 gNO(3)-N/m(3)之间。添加甲醇作为反硝化的碳源。进水流量从9 L/天逐渐增加到40 L/天（氮输入负荷从45 gNO(3)-N/(m(3)h)增加到250 gNO(3)-N/(m(3)h)）。在硝酸盐负荷为250 gNO(3)-N/(m(3)h)时，观察到的最高反硝化速率为135 gNO(3)-N/(m(3)h)，对于高达100 gNO(3)-N/(m(3)h)的负荷，去除效率高于90%。观察到消耗的COD与去除的NO(3)-N之间的质量关系约为3.31。在先前阶段，使用添加硝酸盐作为唯一污染物的自来水作为合成进料取得了更好的结果（临界负荷为130 gNO(3)-N/(m(3)h)，在硝酸盐负荷为250 gNO(3)-N/(m(3)h)时反硝化速率为200 gNO(3)-N/(m(3)h)）。这一事实可能表明工业源的化学成分在一定程度上阻碍了生物过程的性能。无论哪种情况，结果都证明了反硝化过程对整体工业废水的可行性。应用基于底物消耗的Monod动力学和恒定生物量浓度的简单模型对工业废水处理进行建模，并获得了合理良好的拟合。
