Study On The ABR Start-up And Its Kinetic Model

The reactor's start-up and its kinetic model were studied based on a series of testing using starch and glucose wastewater. In this work, the most suitable operating condition of ABR was studied. The result could be summarized as follows:①The ABR reactor was successfully started in 70 days. When the starting-up was ended, the reactor's VLR reached 8.00kgCOD/(m3?d) and its COD removal efficiency reached 80%. The reactor's temperature had great influence on the reactor's COD removal efficiency when it was between 23～30℃. The COD removal efficiency of the reactor decreased from 81% to 60% when the temperature dropped from 35℃to 23℃, So temperature controlling is quite important to the reactor's starting-up.②The VLR had remarkable influence on COD removal efficiency,VFA,pH and ALK when the reactor is in 35oC.③The VFA changes had small influence on the front cells but remarkable influence on the others. When the pH of outflow was out of rage, the COD removal efficiency of the reactor decreased significantly.④The hydraulic load had great influence on ABR reactor because it concerns the degree of mixing of the sludge and water and the washing away of the sludge. At the beginning of the ABR starting-up, the speed of the up-flow water should be between at 0.15m/h and 0.25m/h. At the end of the starting-up, the reactor's up-flow water was at a speed of 0.48 m/h.⑤Based on Andrews Equation suspension growth dynamic models on ABR is developed according to the characteristics of the reactor, Moreover, two different ways of model building are studied and their accuracies were compared. The results showed that the relative error was below 5% when the reactor was seem as single CSTR reactor as it was about 15% when the reactor was seem as four tandem CSTR reactors.