Simultaneous nitrogen and phosphorus removal under low dissolved oxygen conditions

A full-scale test was operated by using low dissolved oxygen activated sludge process to enhance biological nitrogen and phosphorus removal. When the influent concentrations of CODCr, TN and TP varied in a range of 352.9 mg/L-1338.2 mg/L, 34.4 mg/L-96.3 mg/L, and 2.21 mg/L-24.0 mg/L, the average removal efficiencies were 94.9%, 86.7% and 93.0%, respectively. During the test period of two months, effluent meas of CODCr,, BOD5, NH3-N, TN and TP were below 50 mg/L, 25 mg/L, 10 mg/L and 1.0 mg/L respectively. The low dissolved oxygen activated sludge process has a simple flow sheet, fewer facilities and high N and P removal efficiency. It is very convenient to retrofit the conventional activated sludge process with the above process.

利用化学计量学方法解析有机污染物降解的动力学过程

利用因子分析、数值遗传算法等化学计量学方法研究了电催化降解有机污染物的动力学过程。以Ti/SnO2+Sb2O3催化电极为阳极对偶氮类染料甲基橙进行电催化降解为研究对象，采用紫外－可见光度法为测量手段，通过对降解过程中测得的不同波长、不同降解时间的两维吸光度矩阵进行解析，获得了降解过程中存在的组分数、降解的动力学模型等信息。研究表明，甲基橙在Ti/SnO2+Sb2O3电极上的氧化降解的动力学过程符合连串反应模型，反应过程中产生了带苯环结构的中间体。