基于一级动力学模型的水培蔬菜滤床氮磷去除模拟  

Simulation of nitrogen and phosphorus removal in hydroponic vegetable filter bed based on first-order kinetics model

作　　者：殷志平[1] 吴义锋[1] 吕锡武[1] 

机构地区：[1]东南大学能源与环境学院,南京210096

出　　处：《东南大学学报（自然科学版）》2016年第4期812-817,共6页Journal of Southeast University：Natural Science Edition

基　　金："十二五"国家科技支撑计划资助项目(2013BAJ10B13)

摘　　要：采用水培蔬菜滤床(HVFB)净化及经生化处理后的生活污水尾水,并选用一级动力学模型开展HVFB氮磷去除动力学试验研究.基于Arrhenius公式采用试验数据分析水温与一级反应面积速率常数K间关系,采用乘幂和指数回归方程拟合20℃时面积速率常数K20与水力负荷间关系,并构建滤床模型拓展式.Arrhenius拟合结果表明,番茄滤床的氨氮、总氮(TN)和总磷(TP)的温度系数θ值分别为1.08,1.06和1.01,空心菜滤床θ值分别为1.07,1.04和1.00,氨氮、TN的K值与水温呈显著正相关,氨氮的K值受水温影响更为敏感,TP的K值与水温无明显关系.在拟合K_(20)与水力负荷关系上,乘幂回归整体上较指数回归具有更高的准确性.考虑了水温和水力负荷因素的一级动力学模型拓展式的预测具有较高的准确性和可靠性.增强TN去除效率(水温小于19.5℃)和TP去除效率(水温大于19.5℃),可有效提高HVFB整体进水水力负荷.The kinetics studies on nitrogen and phosphorus removal in hydroponic vegetable filter beds（ HVFB） were conducted by using first-order kinetics model. The rawwater was domestic sew-age which were treated by biochemical treatment processes. The dependence of first-order area rate constant K of the water temperature was estimated by the Arrhenius equation,and the relationship between K20 and hydraulic loading rate q was analyzed by power and exponential regression equations. Meanwhile,the extended kinetics model of the filter bed was constructed. The results showthat,for the tomato filter bed,the temperature coefficient θ values of ammonia nitrogen,total nitrogen（ TN）,and total phosphorus（ TP） were 1. 08,1. 06,and 1. 01,respectively,and the θ values in water spinach filter bed were 1. 07,1. 04,and 1. 00,respectively. The K values of ammonia nitrogen and TN have significant positive correlation with the water temperature,and the K values of ammonia nitrogen are more sensitive to water temperature change,but there are no significant differences between the K values at different water temperatures for TP. Compared with exponential regression equation,power regression equation is more suitable for describing the relationship between K20 and q. The extended first-order models,considering the influences of the water temperature and q on K,have a certain accuracy and higher reliability in predicting removal results of filter beds. Enhanced TN removal efficiency（ water temperature is lower than 19. 5 ℃） and TP removal efficiency（ water temperature is higher than 19. 5 ℃） will cause an overall increase on hydraulic loading rate of HVFB.

关 键 词：水培蔬菜滤床 氮 磷 一级动力学模型 一级动力学模型拓展式 

分 类 号：X171[环境科学与工程—环境科学]